阅读说明：本技术 一种环保无水电镀基材的制作工艺 (Manufacturing process of environment-friendly anhydrous electroplating base material ) 是由 刘畅 廖添秋 王起峰 于 2019-09-11 设计创作，主要内容包括：本发明公开了一种环保无水电镀基材的制作工艺,包括如下步骤：前处理→静电喷涂→加热固化→冷却→清洗成品表面→检查后转入下道工序,本发明一种环保无水电镀基材的制作工艺利用静电喷液设备(静电喷涂机)把水溶性纳米电镀处理液喷涂到基材的表面,在静电作用下,水溶性纳米电镀处理液会均匀的吸附于基材表面,形成液态的涂层,液态涂层经过高温烘烤流平固化,喷涂效果在机械强度、附着力、耐腐蚀、耐老化等方面优于电镀工艺,成本也在同效果的电镀之下。(The invention discloses a manufacturing process of an environment-friendly anhydrous electroplating base material, which comprises the following steps: the manufacturing process of the environment-friendly anhydrous electroplating base material utilizes electrostatic liquid spraying equipment (electrostatic spraying machine) to spray water-soluble nano electroplating treatment liquid on the surface of the base material, the water-soluble nano electroplating treatment liquid can be uniformly adsorbed on the surface of the base material under the action of static electricity to form a liquid coating, the liquid coating is baked at high temperature for leveling and solidification, the spraying effect is superior to that of the electroplating process in the aspects of mechanical strength, adhesive force, corrosion resistance, ageing resistance and the like, and the cost is also lower than that of electroplating with the same effect.)

1. The manufacturing process of the environment-friendly anhydrous electroplating base material is characterized by comprising the following steps of: the method comprises the following steps: pretreatment → electrostatic spraying → heating and curing → cooling → cleaning the surface of the finished product → inspection and then transferring to the next process;

s1 pretreatment

Cleaning, dedusting, degreasing and stain removing (ultrasonic cleaning and plasma dedusting or other modes) of processed base material completely

Secondly, drying the cleaned base material by using an air pump and cooling the base material to below 35 ℃;

s2 Electrostatic spraying

Checking before spraying: checking whether the pretreatment of the base material meets the standard requirements, if a problem is found, returning to the pretreatment process in time for reprocessing, and only the qualified parts can be transferred to a spraying workshop for spraying;

preparing before spraying:

(2.1) checking whether the base material product mark number and the coating color conform to the production plan list;

(2.2) checking whether the electrostatic spraying machine, the spray gun and the liquid supply system (used for storing the water-soluble nano electroplating treatment liquid) work normally or not;

an electrostatic spraying machine: the electrostatic high voltage is kept at 60-90KV, and the water-soluble nano electroplating treatment liquid is easy to rebound and edge pockmark due to overhigh voltage; the adhesive force of the water-soluble nano electroplating treatment liquid is reduced due to too low voltage;

● electrostatic current is 10-20 muA, when the current is too high, the discharge breakdown is easy to generate on the coating of the water-soluble nano electroplating treatment solution; the adhesive force of the water-soluble nano electroplating treatment liquid is reduced due to too low current;

● the flow rate pressure is 0.30-0.55Mpa, the higher the flow rate pressure is, the faster the deposition rate of the water-soluble nano electroplating treatment liquid is, which is beneficial to quickly obtain the coating with the preset thickness, but the too high will increase the dosage of the water-soluble nano electroplating treatment liquid and the abrasion speed of the spray gun;

● atomization pressure is 0.30-0.45Mpa, increasing atomization pressure can keep the thickness of water-soluble nano electroplating processing liquid uniform, but too high can make liquid-feeding part wear rapidly; the covering capacity of the water-soluble nano electroplating treatment liquid can be improved by properly reducing the atomization pressure, but the liquid conveying part is easy to block due to too low atomization pressure;

● the pressure of the spray gun is 0.5MPa, the abrasion of the gun head can be accelerated when the pressure of the spray gun is too high, and the gun head is easily blocked when the pressure of the spray gun is too low;

● the liquid supply system comprises a new liquid barrel, a rotary sieve and a liquid supply barrel, the fluidization pressure of the liquid supply barrel is 0.04-0.10 MPa;

thirdly, spraying:

(3.1) the base material enters a spray gun position of a powder spraying room through a conveying chain;

(3.2) the static generator discharges high-voltage static electricity (negative electrode) to the space in the direction of the base material through an electrode needle at the mouth of the spray gun, and the high-voltage static electricity ionizes the mixture of the water-soluble nano electroplating treatment solution and the compressed air sprayed from the mouth of the spray gun and the air around the electrode (carries negative charge);

(3.3) the base material is grounded (grounding electrode) through a hanging tool through a conveying chain, so that an electric field is formed between the spray gun and the base material, the water-soluble nano electroplating treatment liquid reaches the surface of the base material under the double push of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the base material by virtue of electrostatic attraction;

(3.4) recovering the fallen water-soluble nano electroplating treatment solution through a recovery system, and sieving the recovered water-soluble nano electroplating treatment solution for reuse;

s3 heating and curing

Placing the base material attached by the water-soluble nano electroplating treatment liquid on a baking vehicle and heating and sintering the base material in a furnace body at the temperature of 120-180 ℃ for 15-45 minutes;

s4 Cooling

Opening the furnace door to reduce the temperature of the component to normal temperature, pulling out the baking vehicle, pulling the baking vehicle when the furnace door can not be opened, preventing the component from swinging and colliding at high temperature, and then performing quick high-pressure air cooling for 3-5 minutes, low-pressure air cooling for 10-30 minutes or natural cooling for 2-8 hours on the base material finished product with the coating;

s5 cleaning the surface of the finished product

Cleaning the surface of the product with water or ethanol

S6, checking, and transferring to the next procedure

And (3) withdrawing the upper part of the baking trolley into a designated place for product inspection, wherein the appearance (whether the upper part is flat and bright, whether particles, shrinkage holes and other defects exist) and the thickness (controlled to be 55-90 mu m) are mainly inspected in daily life, finished products after finished product inspection are classified and placed in a transport trolley and a turnover box, and are isolated from each other by soft materials such as newspaper and the like so as to prevent scratches and make marks for later use.

2. The manufacturing process of an environment-friendly anhydrous electroplating substrate according to claim 1, wherein the distance from the muzzle to the substrate during spraying in S2 is 150mm-300mm, and the speed of the conveying chain is 4.5-5.5 m/min.

3. The process for manufacturing an environment-friendly anhydrous electroplating substrate according to claim 1, wherein a top plate and a wall plate of the inner cavity of the powder spraying chamber in S2 are made of light-transmitting polypropylene plastic, and a bottom plate and a base of the inner cavity of the powder spraying chamber are made of stainless steel.

4. The process for preparing an environment-friendly anhydrous electroplating substrate according to claim 3, wherein an auxiliary system is further arranged in the powder spraying chamber in the step S2, and the auxiliary system comprises an air conditioner and a dehumidifier.

5. The process of claim 4, wherein the gun and electrostatic controller gun of S2 is provided with a corona ring in addition to the traditional built-in electrode needle.

6. The process of claim 1, wherein the major apparatus for heat curing of the water-soluble nano electroplating solution in S3 comprises a heat supply burner, a circulating fan, a return air duct, and a furnace body.

Technical Field

The invention relates to the technical field related to electroplating base materials, in particular to a manufacturing process of an environment-friendly anhydrous electroplating base material.

Background

The traditional various substrates have material limitations (hardware, plastics, rubber and the like) during electroplating, the traditional electroplating generates a large amount of high-risk waste water and gas in the manufacturing process, the construction environment is severe, a large amount of energy is consumed, and the whole process has no water gas emission, is safe, environment-friendly and energy-saving.

Therefore, a manufacturing process of the environment-friendly anhydrous electroplating base material is provided.

Disclosure of Invention

The invention aims to provide a manufacturing process of an environment-friendly anhydrous electroplating base material, aiming at solving the problems that various traditional base materials have material limitations (hardware, plastics, rubber and the like) during electroplating, a large amount of high-risk waste water and gas are generated in the manufacturing process of traditional electroplating, the construction environment is severe, a large amount of energy is consumed, and the whole process of the invention has no water and gas emission and is safe, environment-friendly and energy-saving.

In order to achieve the purpose, the invention is realized by the following technical scheme: the manufacturing process of the environment-friendly anhydrous electroplating base material is characterized by comprising the following steps of: pretreatment → electrostatic spraying → heating and curing → cooling → cleaning the surface of the finished product → inspection and then transferring to the next process.

S1 pretreatment

The processed base material is cleaned thoroughly to remove dust, oil and stain. (ultrasonic cleaning + plasma dust removal or other means)

And secondly, drying the cleaned base material by using an air pump and cooling the base material to below 35 ℃.

The water-soluble nano electroplating treatment liquid can be sprayed on the base material after oil stains and dust on the surface of the base material are removed through pretreatment, and the physicochemical property and the appearance quality of the finished base material can be ensured only by completely drying the water of the pretreated workpiece and fully cooling the workpiece to below 35 ℃.

S2: electrostatic spraying

Checking before spraying: and (4) checking whether the pretreatment of the base material meets the standard requirements, if a problem is found, returning to the pretreatment process in time for reprocessing, and transferring the qualified part into a spraying workshop for spraying.

Preparing before spraying:

and (2.1) checking whether the base material product mark number and the coating color accord with the production schedule.

(2.2) checking whether the electrostatic spraying machine, the spray gun and the liquid supply system (used for storing the water-soluble nano electroplating treatment liquid) work normally or not;

an electrostatic spraying machine: the electrostatic high voltage is kept at 60-90KV, and the water-soluble nano electroplating treatment liquid is easy to rebound and edge pockmark due to overhigh voltage; the adhesive force of the water-soluble nano electroplating treatment liquid is reduced due to too low voltage;

electrostatic current is 10-20 muA, and discharge breakdown is easily generated when the current is too high to break down the coating of the water-soluble nano electroplating treatment solution; the adhesive force of the water-soluble nano electroplating treatment liquid is reduced due to too low current;

the flow rate pressure is 0.30-0.55Mpa, the higher the flow rate pressure is, the faster the deposition speed of the water-soluble nano electroplating treatment liquid is, which is beneficial to quickly obtaining a coating with a preset thickness, but the too high flow rate pressure can increase the consumption of the water-soluble nano electroplating treatment liquid and the abrasion speed of a spray gun;

the atomization pressure is 0.30-0.45Mpa, the thickness of the water-soluble nano electroplating treatment liquid can be kept uniform by properly increasing the atomization pressure, but the liquid conveying part is quickly abraded due to overhigh atomization pressure; the covering capacity of the water-soluble nano electroplating treatment liquid can be improved by properly reducing the atomization pressure, but the liquid conveying part is easy to block due to too low atomization pressure;

the pressure of the spray gun is 0.5MPa, the abrasion of the gun head can be accelerated when the pressure of the spray gun is too high, and the gun head is easily blocked when the pressure is too low.

The liquid supply system consists of a new liquid barrel, a rotary screen and a liquid supply barrel. The fluidization pressure of the liquid supply barrel is 0.04-0.10 MPa, the density of the water-soluble nano electroplating treatment liquid can be reduced due to overhigh fluidization pressure of the liquid supply barrel, so that the production efficiency is reduced, and insufficient liquid supply or uneven flow velocity of the water-soluble nano electroplating treatment liquid is easy to occur due to overlow fluidization pressure of the liquid supply barrel.

Thirdly, spraying:

(3.1) the base material enters a spray gun position of a powder spraying room through a conveying chain, the distance between a gun opening and the base material is 150-300 mm during spraying, discharging is easily generated to break through a coating of the water-soluble nano electroplating treatment solution when the distance is too close, the using amount of the water-soluble nano electroplating treatment solution is increased and the production efficiency is reduced when the distance is too far, and the speed of the conveying chain is 4.5-5.5 m/min. Too fast a speed of the conveying chain causes insufficient thickness of the coating of the water-soluble nano electroplating treatment liquid, and too slow a speed reduces production efficiency.

(3.2) the static generator discharges high-voltage static electricity (negative electrode) to the space in the direction of the base material through an electrode needle at the mouth of the spray gun, and the high-voltage static electricity ionizes the mixture of the water-soluble nano electroplating treatment solution and the compressed air sprayed from the mouth of the spray gun and the air around the electrode (carries negative charge);

(3.3) the base material is grounded (grounding electrode) through a hanging tool through a conveying chain, so that an electric field is formed between the spray gun and the base material, the water-soluble nano electroplating treatment liquid reaches the surface of the base material under the double push of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the base material by virtue of electrostatic attraction;

the top plate and the wall plate of the inner cavity of the powder spraying chamber are made of light-transmitting polypropylene plastics so as to reduce the adhesion amount of the water-soluble nano electroplating treatment liquid to the maximum extent and prevent electrostatic charge accumulation from interfering with an electrostatic field, and the bottom plate and the base of the inner cavity of the powder spraying chamber are made of stainless steel materials, so that the powder spraying chamber is convenient to clean and has enough mechanical strength;

an auxiliary system is also arranged in the powder spraying chamber, and the auxiliary system comprises an air conditioner and a dehumidifier.

The air conditioner has the functions of keeping the temperature of the sprayed powder below 35 ℃ to prevent the water-soluble nano electroplating treatment solution from caking; and secondly, the micro negative pressure of the powder spraying chamber is maintained through air circulation (the wind speed is less than 0.3 m/s). The dehumidifier has the functions of keeping the relative humidity of the powder spraying chamber at 45-55%, easily generating discharge breakdown on the water-soluble nano electroplating treatment liquid coating by air with overlarge humidity, and not easily ionizing due to too small conductivity difference.

The spray gun and the electrostatic controller spray gun are provided with annular corona outside the traditional built-in electrode needle, so that the electrostatic field is more uniform to keep the thickness of the coating of the water-soluble nano electroplating treatment solution uniform, and the electrostatic controller generates required electrostatic high voltage and keeps the stability of the electrostatic high voltage, and the fluctuation range is less than 10%.

(3.4) recovering the fallen water-soluble nano electroplating treatment solution through a recovery system, and sieving the water-soluble nano electroplating treatment solution for reuse.

S3 heating and curing

The base material attached by the water-soluble nano electroplating treatment liquid is placed on a baking vehicle and is heated and sintered for 15-45 minutes in a furnace body at the temperature of 120-180 ℃.

The main equipment for heating and curing the water-soluble nano electroplating treatment solution comprises a heat supply burner, a circulating fan, an air return pipe and a furnace body, wherein the used heat supply burner is a German Weisuo product, and 0-35 # light diesel oil is used, so that the water-soluble nano electroplating treatment solution has the advantages of high heating efficiency and oil saving; the circulating fan carries out heat exchange, the first-stage opening of the blast pipe is arranged at the bottom of the furnace body, and the first-stage opening is arranged at the interval of 600mm upwards and has three stages, so that the temperature fluctuation within the range of 1200mm of the base material can be kept to be less than 5 ℃, and the overlarge upper and lower chromatic aberration of the base material is prevented; the return air pipe is arranged at the top of the furnace body, so that the upper temperature and the lower temperature in the furnace body are ensured to be as uniform as possible, the furnace body is of a bridge structure, hot air can be stored favorably, and the phenomenon that the volume of air in the furnace is reduced to suck external dust and impurities after production is finished can be prevented.

S4 Cooling

Opening the furnace door to reduce the temperature of the parts to normal temperature, pulling out the baking cart, and pulling the baking cart to prevent the parts from swinging and colliding at high temperature, and then performing quick high-pressure air cooling for 3-5 minutes, low-pressure air cooling for 10-30 minutes or natural cooling for 2-8 hours on the base material finished product with the coating.

S5 cleaning the surface of the finished product

Cleaning the surface of the product with water or ethanol

S6, checking, and transferring to the next procedure

And (3) withdrawing the upper part of the baking trolley into a designated place for product inspection, wherein the appearance (whether the upper part is flat and bright, whether particles, shrinkage holes and other defects exist) and the thickness (controlled to be 55-90 mu m) are mainly inspected in daily life, finished products after finished product inspection are classified and placed in a transport trolley and a turnover box, and are isolated from each other by soft materials such as newspaper and the like so as to prevent scratches and make marks for later use.

Compared with the prior art, the invention has the beneficial effects that: the invention has the characteristics of reasonable design and simple operation, the manufacturing process of the environment-friendly anhydrous electroplating base material utilizes the electrostatic liquid spraying equipment (electrostatic spraying machine) to spray the water-soluble nano electroplating treatment liquid on the surface of the base material, the water-soluble nano electroplating treatment liquid can be uniformly adsorbed on the surface of the base material under the electrostatic action to form a liquid coating, the liquid coating is baked, leveled and solidified at high temperature, the spraying effect is better than that of the electroplating process in the aspects of mechanical strength, adhesive force, corrosion resistance, aging resistance and the like, and the cost is also lower than that of electroplating with the same effect.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described clearly and completely in conjunction with the description of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention provided in the description is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention provides a technical scheme that: the manufacturing process of the environment-friendly anhydrous electroplating base material is characterized by comprising the following steps of: pretreatment → electrostatic spraying → heating and curing → cooling → cleaning the surface of the finished product → inspection and then transferring to the next process.

S1: pretreatment

The processed base material is cleaned thoroughly to remove dust, oil and stain. (ultrasonic cleaning + plasma dust removal or other means)

And secondly, drying the cleaned base material by using an air pump and cooling the base material to below 35 ℃.

The water-soluble nano electroplating treatment liquid can be sprayed on the base material after oil stains and dust on the surface of the base material are removed through pretreatment, and the physicochemical property and the appearance quality of the finished base material can be ensured only by completely drying the water of the pretreated workpiece and fully cooling the workpiece to below 35 ℃.

S2 Electrostatic spraying

Checking before spraying: and (4) checking whether the pretreatment of the base material meets the standard requirements, if a problem is found, returning to the pretreatment process in time for reprocessing, and transferring the qualified part into a spraying workshop for spraying.

Preparing before spraying:

and (2.1) checking whether the base material product mark number and the coating color accord with the production schedule.

(2.2) checking whether the electrostatic spraying machine, the spray gun and the liquid supply system (used for storing the water-soluble nano electroplating treatment liquid) work normally or not;

electrostatic coating machine: the electrostatic high voltage is kept at 60-90KV, and the water-soluble nano electroplating treatment liquid is easy to rebound and edge pockmark due to overhigh voltage; the adhesive force of the water-soluble nano electroplating treatment liquid is reduced due to too low voltage;

electrostatic current is 10-20 muA, and discharge breakdown is easily generated when the current is too high to break down the coating of the water-soluble nano electroplating treatment solution; the adhesive force of the water-soluble nano electroplating treatment liquid is reduced due to too low current;

the flow rate pressure is 0.30-0.55Mpa, the higher the flow rate pressure is, the faster the deposition speed of the water-soluble nano electroplating treatment liquid is, which is beneficial to quickly obtaining a coating with a preset thickness, but the too high flow rate pressure can increase the consumption of the water-soluble nano electroplating treatment liquid and the abrasion speed of a spray gun;

the atomization pressure is 0.30-0.45Mpa, the thickness of the water-soluble nano electroplating treatment liquid can be kept uniform by properly increasing the atomization pressure, but the liquid conveying part is quickly abraded due to overhigh atomization pressure; the covering capacity of the water-soluble nano electroplating treatment liquid can be improved by properly reducing the atomization pressure, but the liquid conveying part is easy to block due to too low atomization pressure;

the pressure of the spray gun is 0.5MPa, the abrasion of the gun head can be accelerated when the pressure of the spray gun is too high, and the gun head is easily blocked when the pressure is too low.

The liquid supply system consists of a new liquid barrel, a rotary screen and a liquid supply barrel. The fluidization pressure of the liquid supply barrel is 0.04-0.10 MPa. Too high fluidizing pressure of the liquid supply barrel can reduce the density of the water-soluble nano electroplating treatment liquid to reduce the production efficiency, and too low is easy to cause insufficient liquid supply or uneven flow velocity of the water-soluble nano electroplating treatment liquid.

The water-soluble nano electroplating treatment liquid coating is firstly added into a new liquid barrel, compressed air passes through micropores on a fluidization plate at the bottom of the new liquid barrel to pre-fluidize the water-soluble nano electroplating treatment liquid, and the water-soluble nano electroplating treatment liquid is conveyed to a rotary screen through a liquid pump. The water-soluble nano electroplating treatment liquid particles (more than 100 mu m) with overlarge particle sizes are separated out by a rotary screen, the residual water-soluble nano electroplating treatment liquid falls into a liquid supply barrel, and the liquid supply barrel fluidizes the water-soluble nano electroplating treatment liquid to a specified degree and supplies the fluidized water-soluble nano electroplating treatment liquid to a spray gun for spraying a base material through a liquid pump and a liquid conveying pipe.

S2, electrostatic spraying:

(3.1) the base material enters a spray gun position of a powder spraying room through a conveying chain, the distance between a gun opening and the base material is 150-300 mm during spraying, discharging is easily generated to break through a coating of the water-soluble nano electroplating treatment solution when the distance is too close, the using amount of the water-soluble nano electroplating treatment solution is increased and the production efficiency is reduced when the distance is too far, and the speed of the conveying chain is 4.5-5.5 m/min. Too fast a speed of the conveying chain causes insufficient thickness of the coating of the water-soluble nano electroplating treatment liquid, and too slow a speed reduces production efficiency.

(3.2) the static generator discharges high-voltage static electricity (negative electrode) to the space in the direction of the base material through an electrode needle at the mouth of the spray gun, and the high-voltage static electricity ionizes the mixture of the water-soluble nano electroplating treatment solution and the compressed air sprayed from the mouth of the spray gun and the air around the electrode (carries negative charge);

(3.3) the base material is grounded (grounding electrode) through a hanging tool through a conveying chain, so that an electric field is formed between the spray gun and the base material, the water-soluble nano electroplating treatment liquid reaches the surface of the base material under the double push of electric field force and compressed air pressure, and a uniform coating is formed on the surface of the base material by virtue of electrostatic attraction;

the top plate and the wall plate of the inner cavity of the powder spraying chamber are made of light-transmitting polypropylene plastics so as to reduce the adhesion amount of the water-soluble nano electroplating treatment liquid to the maximum extent and prevent electrostatic charge accumulation from interfering with an electrostatic field, and the bottom plate and the base of the inner cavity of the powder spraying chamber are made of stainless steel materials, so that the powder spraying chamber is convenient to clean and has enough mechanical strength;

an auxiliary system is also arranged in the powder spraying chamber, and the auxiliary system comprises an air conditioner and a dehumidifier.

The air conditioner has the functions of keeping the temperature of the sprayed powder below 35 ℃ to prevent the water-soluble nano electroplating treatment solution from caking; and secondly, the micro negative pressure of the powder spraying chamber is maintained through air circulation (the wind speed is less than 0.3 m/s). The dehumidifier has the functions of keeping the relative humidity of the powder spraying chamber at 45-55%, easily generating discharge breakdown on the water-soluble nano electroplating treatment liquid coating by air with overlarge humidity, and not easily ionizing due to too small conductivity difference.

The spray gun and the electrostatic controller spray gun are provided with annular corona outside the traditional built-in electrode needle, so that the electrostatic field is more uniform to keep the thickness of the coating of the water-soluble nano electroplating treatment solution uniform, and the electrostatic controller generates required electrostatic high voltage and keeps the stability of the electrostatic high voltage, and the fluctuation range is less than 10%.

(3.4) recovering the fallen water-soluble nano electroplating treatment solution through a recovery system, and sieving the water-soluble nano electroplating treatment solution for reuse.

A recovery system: the water-soluble nano electroplating treatment solution sprayed by the spray gun is partially adsorbed on the surface of the base material (generally 50-70%, 70% by the company), and the rest naturally subsides. Part of the water-soluble nano electroplating treatment liquid in the sedimentation process is collected by a cyclone recoverer on the side wall of the powder spraying booth, water-soluble nano electroplating treatment liquid particles (more than 12 microns) with larger particle sizes are separated by using a centrifugal separation principle and are sent back to a rotary sieve for reuse, the water-soluble nano electroplating treatment liquid particles below 12 microns are sent into a filter element recoverer, the water-soluble nano electroplating treatment liquid is vibrated into a collection hopper at the bottom of a filter element by pulse compressed air, the water-soluble nano electroplating treatment liquid is periodically cleaned and boxed for secondary utilization, and clean air (containing the water-soluble nano electroplating treatment liquid with the particle sizes smaller than 1 micron and the concentration smaller than 5g/m3) for separating the water-soluble nano electroplating treatment liquid is discharged into the powder spraying booth so as to maintain the micro negative pressure in the powder spraying booth. Dust and impurities outside the powder spraying chamber are easily sucked when the negative pressure is too large, and water-soluble nano electroplating treatment liquid is easily overflowed when the negative pressure is too small or the positive pressure is too positive. And collecting the water-soluble nano electroplating treatment solution settled to the bottom of the powder spraying shed, feeding the water-soluble nano electroplating treatment solution into a rotary sieve for reuse through a powder pump, wherein the mixing ratio of the recovered water-soluble nano electroplating treatment solution to the new water-soluble nano electroplating treatment solution is (1:3) - (1: 1).

S3 heating and curing

The base material attached by the water-soluble nano electroplating treatment liquid is placed on a baking vehicle and is heated and sintered for 15-45 minutes in a furnace body at the temperature of 120-180 ℃.

As the basic principle of curing the water-soluble nano electroplating treatment liquid, the epoxy group in the epoxy resin, the carboxyl group in the polyester resin and the amino group in the curing agent are subjected to polycondensation and addition reaction to be crosslinked into a macromolecular reticular body, and meanwhile, micromolecular gas (by-product) is released. The solidification process is divided into 4 stages of melting, leveling, gelling and solidification.

After the temperature is raised to the melting point, the surface water-soluble nano electroplating treatment solution on the base material begins to melt, and gradually forms a vortex with the internal water-soluble nano electroplating treatment solution until the water-soluble nano electroplating treatment solution is completely melted. After the water-soluble nano electroplating treatment solution is completely melted, the water-soluble nano electroplating treatment solution begins to flow slowly, a thin and flat layer is formed on the surface of the base material, and leveling is called at the stage. The temperature is continuously increased to reach a gel point and then has a short gelled state (the temperature is kept unchanged), and then the temperature is continuously increased to generate chemical reaction of the water-soluble nano electroplating treatment solution to be solidified

The main equipment for heating and curing the water-soluble nano electroplating treatment solution comprises a heat supply burner, a circulating fan, an air return pipe and a furnace body, wherein the used heat supply burner is a German Weisuo product, and 0-35 # light diesel oil is used, so that the water-soluble nano electroplating treatment solution has the advantages of high heating efficiency and oil saving; the circulating fan carries out heat exchange, the first-stage opening of the blast pipe is arranged at the bottom of the furnace body, and the first-stage opening is arranged at the interval of 600mm upwards and has three stages, so that the temperature fluctuation within the range of 1200mm of the base material can be kept to be less than 5 ℃, and the overlarge upper and lower chromatic aberration of the base material is prevented; the return air pipe is arranged at the top of the furnace body, so that the upper temperature and the lower temperature in the furnace body are ensured to be as uniform as possible, the furnace body is of a bridge structure, hot air can be stored favorably, and the phenomenon that the volume of air in the furnace is reduced to suck external dust and impurities after production is finished can be prevented.

S4: cooling down

Opening the furnace door to reduce the temperature of the parts to normal temperature, pulling out the baking cart, and pulling the baking cart to prevent the parts from swinging and colliding at high temperature, and then performing quick high-pressure air cooling for 3-5 minutes, low-pressure air cooling for 10-30 minutes or natural cooling for 2-8 hours on the base material finished product with the coating.

S5: cleaning the surface of the finished product

Cleaning the surface of the product with water or ethanol

S6: the next procedure is carried out after the examination

And (3) withdrawing the upper part of the baking trolley into a designated place for product inspection, wherein the appearance (whether the upper part is flat and bright, whether particles, shrinkage holes and other defects exist) and the thickness (controlled to be 55-90 mu m) are mainly inspected in daily life, finished products after finished product inspection are classified and placed in a transport trolley and a turnover box, and are isolated from each other by soft materials such as newspaper and the like so as to prevent scratches and make marks for later use.

The process principle is as follows: the water-soluble nano electroplating treatment liquid is sprayed on the surface of the base material by using an electrostatic spraying device (electrostatic spraying machine), under the action of static electricity, the water-soluble nano electroplating treatment liquid can be uniformly adsorbed on the surface of the base material to form a liquid coating, the liquid coating is baked, leveled and cured at high temperature, the spraying effect is superior to that of an electroplating process in the aspects of mechanical strength, adhesive force, corrosion resistance, aging resistance and the like, and the cost is also under the electroplating with the same effect.

The electrostatic spraying of the water-soluble nano electroplating treatment solution of the electrostatic spray gun comprises a high-voltage electrostatic generator for generating direct-current high voltage and a spray gun for spraying the water-soluble nano electroplating treatment solution. Typically, the substrate is grounded and the lance tip is subjected to a negative high voltage supplied by a high voltage electrostatic generator. When the tip of the electrostatic spray gun is close to the base material, corona discharge is generated, and the water-soluble nano electroplating treatment solution is sprayed out from the spray gun opening and carries negative charges through corona discharge. The water-soluble nano electroplating treatment liquid micro molecules with negative charges reach the surface of the base material under the action of electrostatic force and compressed air flow, and electrostatic attraction is generated between the negative charges of other parts of the water-soluble nano electroplating treatment liquid micro molecules and the base material, so that the water-soluble nano electroplating treatment liquid micro molecules are adsorbed on the surface of the base material, and the base material is knocked, and the water-soluble nano electroplating treatment liquid and the same particles are not easy to fall off. Since the water-soluble nano-electroplating liquid micro-molecules have higher resistance, the negative charges on the micro-molecules are not easy to leak, so that the water-soluble nano-electroplating liquid can be adsorbed on the surface of the substrate for a long time, but the smaller the resistance of the micro-molecules is, the better the resistance is, the larger the resistance is, the negative charges on the water-soluble nano-electroplating liquid micro-molecules are not easy to be adsorbed, and the adsorption force is small, and the specific resistance of the water-soluble nano-electroplating liquid micro-molecules is preferably 102-. Through electrostatic spraying, the water-soluble nano electroplating treatment solution can be uniformly dispersed on the surface of the base material, and the molecules with negative charges have repulsive force. The repulsion is helpful for dispersing micro molecules, and when the water-soluble nano electroplating treatment liquid particle layer adsorbed on the surface of the base material reaches a certain thickness, the water-soluble nano electroplating treatment liquid particle layer can not be thickened. Thereby ensuring that the surface is evenly coated after the base material is solidified. The larger the charge amount of the electrostatic spray gun water-soluble nano-electroplating treatment liquid is, the better the charge amount is. The larger the charge amount is, the larger the adsorption force is, but the larger the repulsion force is, so that the water-soluble nano-plating solution is suitably charged, and generally, to the extent that Q is 107 square feet/gram, the voltage used in the spraying operation is generally 50 to 80KV, the discharge amount is 100A or less, and the distance between the tip of the spray gun and the substrate is preferably 100mm to 200 mm. The coating thickness is generally 50-100 microns when the substrate is not heated, i.e., cold sprayed. If the substrate is heated before spraying, the coating thickness can be increased by decreasing the resistance of the micro molecules on the surface of the substrate and the charge amount of the micro molecular layer during spraying, so that the coating thickness can be up to 500 μm when the substrate is thermally sprayed. In the concave position of the substrate, the higher the application voltage is, the larger the electrostatic shielding effect is due to the electrostatic shielding effect, and then the voltage is required to be reduced for spraying.

The process steps obtained by the design can basically meet the requirements of improving the material limitation (hardware, plastics, rubber and the like) of various traditional base materials during electroplating, the traditional electroplating generates a large amount of high-risk waste water and waste gas in the manufacturing process, the construction environment is severe, and a large amount of energy is consumed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.