阅读说明：本技术 一种带橡胶金属件的防腐方法 (anticorrosion method for metal part with rubber ) 是由 李卫 陈谦 夏威夷 刘安心 于 2019-08-12 设计创作，主要内容包括：一种带橡胶金属件的防腐方法,包括以下步骤：先将粗糙度小于6微米的金属件与具有导电性的橡胶硫化为带橡胶金属件,再对带橡胶金属件进行漆前处理,然后对带橡胶金属件进行电泳涂装,以在金属件表面和橡胶表面形成均匀连续的涂层,涂层的固化温度低于橡胶的硫化温度10℃～20℃,涂层的固化温度为120℃～160℃,涂层的固化时间为30min～50min,该涂层经低温固化后,其耐盐雾性能大于等于600小时,涂层的厚度为15微米～30微米,膜厚均匀,涂层的摩擦系数为0.08～0.18。本设计不仅防腐方法简单、生产成本低、环保,而且提高了带橡胶金属件的防腐性能、提高了橡胶的耐久性能、解决了紧固件的松动问题。(An anticorrosion method for a rubber metal part comprises the following steps: the preparation method comprises the steps of firstly vulcanizing a metal piece with the roughness of less than 6 microns and conductive rubber into a metal piece with the rubber, then carrying out pre-painting treatment on the metal piece with the rubber, and then carrying out electrophoretic coating on the metal piece with the rubber to form a uniform and continuous coating on the surface of the metal piece and the surface of the rubber, wherein the curing temperature of the coating is lower than the vulcanization temperature of the rubber by 10-20 ℃, the curing temperature of the coating is 120-160 ℃, the curing time of the coating is 30-50 min, after the coating is cured at a low temperature, the salt spray resistance of the coating is more than or equal to 600 hours, the thickness of the coating is 15-30 microns, the film thickness is uniform, and the friction coefficient of the coating is 0.. The design has the advantages of simple anticorrosion method, low production cost and environmental protection, and improves the anticorrosion performance of the metal piece with the rubber, the durability of the rubber and the looseness of the fastening piece.)

1. the anticorrosion method for the metal piece with the rubber is characterized by comprising the following steps of:

The method comprises the steps of vulcanizing a metal piece with the roughness less than 6 microns and conductive rubber into a metal piece with rubber, performing pre-painting treatment on the metal piece with the rubber, and performing electrophoretic coating on the metal piece with the rubber to form a uniform and continuous coating on the surface of the metal piece and the surface of the rubber, wherein the salt spray resistance of the coating is more than or equal to 600 hours after the coating is cured at low temperature.

2. A method of protecting a metal piece with rubber according to claim 1, wherein: the low-temperature curing means that: according to the drying specification of the electrophoretic coating adopted by electrophoretic coating, the curing temperature and the curing time of the coating are selected, and the curing temperature of the coating is 10-20 ℃ lower than the vulcanization temperature of rubber.

3. A method of protecting a metal piece with rubber according to claim 2, wherein: the curing temperature of the coating is 120-160 ℃, and the curing time of the coating is 30-50 min.

4. A method of protecting a metal piece with rubber according to claim 1, wherein: the thickness of the coating is 15-30 microns, and the friction coefficient of the coating is 0.08-0.18.

5. a method of protecting a metal piece with rubber according to claim 3, wherein: the rubber is natural rubber, and the vulcanization temperature of the natural rubber is 140-160 ℃.

6. A method of protecting a metal piece with rubber according to claim 3, wherein: the rubber is chloroprene rubber, and the vulcanization temperature of the chloroprene rubber is 150-170 ℃.

7. a method of preventing corrosion of a rubberized metal part according to claim 5 or 6, wherein: the rubber contains carbon black, the mass percentage concentration of the carbon black is 5-40 wt%, and the surface resistance of the rubber is 10%³Ohm-10⁶Ohm.

8. A method of protecting a metal piece with rubber according to claim 7, wherein: the electrophoretic coating is cathode electrophoretic coating.

9. A method of protecting a metal piece with rubber according to claim 8, wherein: the electrophoretic paint is epoxy electrophoretic paint or acrylic electrophoretic paint, and the deblocking temperature of the electrophoretic paint curing agent is 110-130 ℃.

10. A method of protecting a metal piece with rubber according to claim 9, wherein: the drying specification of the electrophoretic coating is as follows: the curing temperature is 120-200 ℃, and the curing time is 10-60 min.

Technical Field

the invention relates to the technical field of automobile coating, in particular to an anticorrosion method for a metal part with rubber, which is mainly suitable for anticorrosion of the metal part with rubber in automobiles and other vehicles.

background

In the manufacturing process of automobiles and other vehicles, a large number of metal parts with rubber, such as a thrust rod rubber bushing assembly, a guide arm rubber bushing and the like, are arranged, the parts are subjected to rubber vulcanization molding at the parts of the formed metal parts, and the vulcanized rubber mainly plays roles in strengthening, damping and the like. The part treatment process is that the rubber is vulcanized and then the surface of the metal part of the part is subjected to antiseptic treatment, and the existing antiseptic treatment methods comprise electroplating, paint spraying and the like because the rubber is not resistant to high-temperature baking. The coating of the part is not easy to be uniformly sprayed due to the paint spraying and coating process, and part of the part, such as a V-shaped thrust rod pin shaft, needs to be assembled through the connection of the fasteners, so that the coating is not uniform, the hardness of the coating after low-temperature curing is not high, false torque is easily generated during the assembly of the fasteners, the fasteners are loosened during use, in addition, the coating is not uniform in thickness, and the problem of assembly quality is easily caused due to the fact that the coating is too thick; the coating is thin, and the corrosion resistance of the coating is poor. The electroplating process is a traditional anticorrosion process, has thin and uniform thickness, has small influence on the tightening torque of the fastener, and is often applied to anticorrosion of metal parts with rubber. But the electroplating process is increasingly subjected to environmental protection restriction factors, and has higher cost and poorer plating layer corrosion resistance; on the other hand, because the edge is not compact during rubber vulcanization, electroplating solution is easy to permeate into the contact part of the vulcanized rubber and the metal layer from the edge during electroplating and generate chemical reaction, the bonding force of the vulcanized rubber and the metal piece is influenced, the bonding force is reduced, and the vulcanized rubber and the metal layer are torn, separated, fallen off and cracked.

The invention discloses a method for bonding a metal workpiece plated with a zinc-nickel alloy layer and rubber, which is disclosed by the invention with the application publication number of CN106003705A and the application publication date of 2016, 10 and 12. Although the method can effectively improve the bonding strength between the metal workpiece of the zinc-nickel alloy plating layer and the rubber, thereby avoiding the problems of degumming and even early damage and failure and effectively ensuring the service life of the rubber damping piece, the method still has the following defects: the adoption of the electroplating process not only causes environmental pollution, but also has poor anticorrosive performance of the electroplated layer and no protective effect of the electroplated layer on rubber.

disclosure of Invention

The invention aims to overcome the defects and problems of environmental pollution, poor coating corrosion resistance and poor rubber durability in the prior art, and provides an anticorrosion method for a metal piece with rubber, which is environment-friendly, energy-saving, good in coating corrosion resistance and good in rubber durability.

In order to achieve the above purpose, the technical solution of the invention is as follows: the anticorrosion method of the metal piece with the rubber comprises the following steps:

The method comprises the steps of vulcanizing a metal piece with the roughness less than 6 microns and conductive rubber into a metal piece with rubber, performing pre-painting treatment on the metal piece with the rubber, and performing electrophoretic coating on the metal piece with the rubber to form a uniform and continuous coating on the surface of the metal piece and the surface of the rubber, wherein the salt spray resistance of the coating is more than or equal to 600 hours after the coating is cured at low temperature.

The low-temperature curing means that: according to the drying specification of the electrophoretic coating adopted by electrophoretic coating, the curing temperature and the curing time of the coating are selected, and the curing temperature of the coating is 10-20 ℃ lower than the vulcanization temperature of rubber.

The curing temperature of the coating is 120-160 ℃, and the curing time of the coating is 30-50 min.

The thickness of the coating is 15-30 microns, and the friction coefficient of the coating is 0.08-0.18.

The rubber is natural rubber, and the vulcanization temperature of the natural rubber is 140-160 ℃.

The rubber is chloroprene rubber, and the vulcanization temperature of the chloroprene rubber is 150-170 ℃.

The rubber contains carbon black, the mass percentage concentration of the carbon black is 5-40 wt%, and the surface resistance of the rubber is 10%³ohm-10⁶Ohm.

The electrophoretic coating is cathode electrophoretic coating.

the electrophoretic paint is epoxy electrophoretic paint or acrylic electrophoretic paint, and the deblocking temperature of the electrophoretic paint curing agent is 110-130 ℃.

The drying specification of the electrophoretic coating is as follows: the curing temperature is 120-200 ℃, and the curing time is 10-60 min.

Compared with the prior art, the invention has the beneficial effects that:

1. The invention relates to an anticorrosion method of a metal piece with rubber, which comprises the steps of vulcanizing a metal piece with the roughness less than 6 microns and rubber with conductivity into a metal piece with rubber, then carrying out electrophoretic coating on the metal piece with rubber to form a uniform and continuous coating on the surface of the metal piece and the surface of the rubber, and curing the coating at low temperature to ensure that the salt spray resistance of the coating is more than or equal to 600 hours; by adopting the electrophoretic coating process, the environmental pollution caused by the electroplating process is avoided, the curing temperature of the coating is low, the thickness of the coating is uniform, the corrosion resistance of the metal piece with the rubber is improved, and in addition, the durability of the rubber is greatly improved by electrophoretic coating on the surface of the rubber. Therefore, the invention not only is environment-friendly and energy-saving, but also improves the corrosion resistance of the metal piece with the rubber and the durability of the rubber.

2. According to the drying specification (curing temperature is 120-200 ℃ and curing time is 10-60 min) of an electrophoretic coating adopted by electrophoretic coating, the curing temperature and curing time of the coating are selected, the curing temperature of the coating is 10-20 ℃ lower than the vulcanization temperature of rubber, the curing temperature of the coating is 120-160 ℃, and the curing time of the coating is 30-50 min; the design selects lower temperature to carry out curing according to different rubber vulcanization temperatures, so that the anti-corrosion method is simple, and the production cost is reduced. Therefore, the invention has simple anticorrosion method and low production cost.

3. According to the anticorrosion method for the metal part with the rubber, the thickness of the coating is 15-30 micrometers, the film thickness is uniform, the friction coefficient of the coating is 0.08-0.18, the false torque is prevented during fastening connection, and therefore the problem of loosening of the fastening piece is solved. Thus, the present invention solves the problem of loosening of the fastener.

4. According to the anticorrosion method for the metal part with the rubber, the rubber contains carbon black, the mass percentage concentration of the carbon black is 5-40 wt%, and the surface resistance of the rubber is 10³ohm-10⁶The carbon black not only can improve the strength of the rubber, but also can ensure the conductivity of the rubber. Therefore, the invention not only ensures that the rubber can be protected by electrophoretic coating, but also improves the strength and the conductivity of the rubber.

Drawings

Fig. 1 is a schematic structural view of a metal member with rubber (a V-shaped thrust rod rubber bushing assembly) according to embodiment 1 of the present invention.

In the figure: rubber 1, bolt mounting hole 2, round pin axle 3, end 4, retaining ring 5, jump ring 6.

Detailed Description

The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.

The anticorrosion method of the metal piece with the rubber comprises the following steps:

The method comprises the steps of vulcanizing a metal piece with the roughness less than 6 microns and conductive rubber into a metal piece with rubber, performing pre-painting treatment on the metal piece with the rubber, and performing electrophoretic coating on the metal piece with the rubber to form a uniform and continuous coating on the surface of the metal piece and the surface of the rubber, wherein the salt spray resistance of the coating is more than or equal to 600 hours after the coating is cured at low temperature.

The low-temperature curing means that: according to the drying specification of the electrophoretic coating adopted by electrophoretic coating, the curing temperature and the curing time of the coating are selected, and the curing temperature of the coating is 10-20 ℃ lower than the vulcanization temperature of rubber.

The curing temperature of the coating is 120-160 ℃, and the curing time of the coating is 30-50 min.

The thickness of the coating is 15-30 microns, and the friction coefficient of the coating is 0.08-0.18.

The rubber is natural rubber, and the vulcanization temperature of the natural rubber is 140-160 ℃.

The rubber is chloroprene rubber, and the vulcanization temperature of the chloroprene rubber is 150-170 ℃.

the rubber contains carbon black, the mass percentage concentration of the carbon black is 5-40 wt%, and the surface resistance of the rubber is 10%³Ohm-10⁶Ohm.

The electrophoretic coating is cathode electrophoretic coating.

The electrophoretic paint is epoxy electrophoretic paint or acrylic electrophoretic paint, and the deblocking temperature of the electrophoretic paint curing agent is 110-130 ℃.

The drying specification of the electrophoretic coating is as follows: the curing temperature is 120-200 ℃, and the curing time is 10-60 min.

The principle of the invention is illustrated as follows:

the design provides a low-temperature curing electrophoretic coating anticorrosion method which has no influence on rubber performance, has a protection effect on rubber and has excellent anticorrosion performance on metal parts connected with the low-temperature curing electrophoretic coating anticorrosion method. The curing temperature of the coating is low, the film thickness is uniform, uniform and continuous coatings can be formed on the surface of the rubber and the surface of the metal piece, the corrosion resistance of the metal piece with the rubber can be improved, and the corrosion resistance of the metal piece can reach or be more than 600 hours. The anticorrosion process is simple, and can avoid the defects in the prior art, such as environmental pollution caused by an electroplating process, no protection effect of an electroplated layer on rubber and the like. Therefore, compared with the prior art, the designed anticorrosion method is simple, the drying temperature is low, the exhaust emission is reduced, the production cost is low, and the method is energy-saving and environment-friendly.

The low-temperature curing process of electrophoretic coating adopted by the design is suitable for all electrophoretic coatings; meanwhile, the high-temperature-resistant rubber is suitable for corrosion prevention of all metal parts with rubber, and the electrophoretic paint can be selected to be corresponding to the rubber according to different vulcanization temperatures of the rubber, can be cured at a higher temperature for a corresponding time, and can also be cured at a lower temperature for a corresponding time. The deblocking temperature of the electrophoretic paint curing agent is the lowest drying temperature of the electrophoretic paint.

because the vulcanization temperature of rubber is much lower than that of electrophoretic coating, if the conventional electrophoretic coating process is adopted, the performances of rubber parts, such as the mechanical performance, the durability and the like of the rubber, are influenced. The rubber in the design has conductivity, the electrophoretic coating can coat a uniform electrophoretic paint film on the rubber and the metal piece at the same time, the paint film at the joint of the rubber and the metal piece is continuous and flat, the paint film has continuity, the sealing effect is realized on the joint, the loosening and the cracking of the rubber are favorably prevented, and the probability of falling off of the rubber from the metal piece is reduced. Therefore, the low-temperature curing electrophoretic coating anticorrosion process adopted by the design enables the surface of the rubber to be provided with a layer of electrophoretic protective coating, can protect the rubber and improves the durability of the rubber.