阅读说明：本技术 一种脚踏自行车车架表面抛光处理工艺 (Surface polishing treatment process for bicycle frame ) 是由 叶建荣 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种脚踏自行车车架表面抛光处理工艺；涉及自行车制造技术领域,包括以下步骤：(1)乙醇溶液超声波辅助浸渍处理；(2)配制配制预处理液；(3)预处理液处理；(4)配制抛光液；(5)抛光处理；本发明提供了一种脚踏自行车车架表面抛光处理工艺,本发明通过配制预处理液,对脚踏自行车车架进行表面处理,能够有效的提高其在抛光液中的抛光效率,一定程度上进一步的提高抛光效果,增强表面光亮度。(The invention discloses a surface polishing treatment process for a bicycle frame of a pedal bicycle; relates to the technical field of bicycle manufacturing, which comprises the following steps: (1) ultrasonic-assisted dipping treatment is carried out on an ethanol solution; (2) preparing a pretreatment solution; (3) treating a pretreatment solution; (4) preparing a polishing solution; (5) polishing; the invention provides a surface polishing treatment process for a bicycle frame, which is characterized in that a pretreatment liquid is prepared to perform surface treatment on the bicycle frame, so that the polishing efficiency of the bicycle frame in the polishing liquid can be effectively improved, the polishing effect is further improved to a certain extent, and the surface brightness is enhanced.)

1. A surface polishing treatment process for a bicycle frame is characterized by comprising the following steps:

(1) ultrasonic-assisted dipping treatment of an ethanol solution:

soaking the bicycle frame in ethanol solution, stirring for 5-8min, soaking for 30-35min, taking out, and drying to constant weight;

(2) preparing a pretreatment solution:

dissolving tert-butyl alcohol in water to prepare a tert-butyl alcohol solution, then adding rare earth chloride into the tert-butyl alcohol solution, and uniformly stirring to obtain a pretreatment solution;

(3) and (3) pretreatment liquid treatment:

immersing the frame of the bicycle into the pretreatment liquid, then adding acetic anhydride and a catalyst into the pretreatment liquid, stirring for 1-1.5 hours at 50-55 ℃, then taking out the frame of the bicycle, washing the surface of the frame of the bicycle with clear water, and drying to constant weight;

(4) preparing a polishing solution:

sequentially adding sodium hydroxide and triethanolamine into water, stirring, adding copper sulfate and nitrate, and stirring for 15-20 min;

(5) polishing treatment:

immersing the pretreated bicycle frame into the polishing solution, heating to 60-62 ℃, soaking for 10s, then performing ultrasonic treatment for 5-8s, taking out, cleaning to be neutral by using clear water, and drying to be constant weight to obtain the polishing solution.

2. The surface polishing treatment process for the bicycle frame as claimed in claim 1, wherein: the mass fraction of the ethanol solution is 30 percent;

the stirring speed is 100 r/min.

3. The surface polishing treatment process for the bicycle frame as claimed in claim 1, wherein: the mass fraction of tertiary butanol in the pretreatment liquid is 10-12%;

the mass fraction of the rare earth chloride is 0.015-0.018%.

4. The surface polishing treatment process for the frame of a bicycle according to claim 3, wherein: the rare earth chloride is lanthanum chloride.

5. The surface polishing treatment process for the bicycle frame as claimed in claim 1, wherein: the molar ratio of the acetic anhydride to the tert-butanol is 1: 1;

the mass ratio of the catalyst to the acetic anhydride is 1: 50.

6. A surface finishing process for bicycle frames as defined in claim 1 or 5, wherein: the catalyst is dibutyltin dilaurate.

7. The surface polishing treatment process for the bicycle frame as claimed in claim 1, wherein: the concentration of sodium hydroxide in the polishing solution is 230-240 g/L;

the concentration of the triethanolamine is 80-90 g/L;

the concentration of the copper sulfate is 110-120 g/L;

the concentration of the nitrate is 255-260 g/L; the balance of water.

8. A surface finishing process for bicycle frames as defined in claim 1 or 7, wherein: the nitrate is the mixture of sodium nitrate and ammonium ceric nitrate;

the mixing mass ratio of the sodium nitrate to the ammonium ceric nitrate is 50: 1.2-1.6.

9. The surface polishing treatment process for the bicycle frame as claimed in claim 1, wherein: the ultrasonic frequency is 40kHz, and the power is 550W.

Technical Field

The invention belongs to the technical field of bicycle manufacturing, and particularly relates to a surface polishing treatment process for a bicycle frame.

Background

Bicycles, also known as bicycles or bicycles, are typically two-wheeled small land vehicles. After a person rides the vehicle, the person steps on the pedal as power, and the vehicle is a green and environment-friendly vehicle. The English language bicycle. Where bi means two and cycle means the wheel, i.e. the two-wheeled vehicle. The bicycle is of various types, including single-person bicycles, double-person bicycles and multi-person bicycles.

The bicycle frame material is mainly processed and manufactured by aluminum alloy materials, and the method for polishing the aluminum alloy surface mainly comprises a mechanical method, an electrochemical method and a chemical method. Mechanical polishing and electrochemical polishing have limited use due to certain requirements on the shape and size of the part. Chemical polishing is not limited by the shape and size of the parts, and can process more parts at one time, so that the chemical polishing is the most common polishing method at present.

The existing chemical polishing method mainly adopts an acidic chemical polishing solution (containing phosphoric acid, sulfuric acid and nitric acid, commonly called as a triacid polishing solution), and the acidic chemical polishing solution has the advantages that: the polishing effect is good, and the surface of the polished part is bright and flat; the disadvantages are: a large amount of NOx gas is generated in the polishing process, and the pollution to the environment is serious.

Disclosure of Invention

The invention aims to provide a surface polishing treatment process for a bicycle frame, which aims to overcome the defects in the prior art.

The technical scheme adopted by the invention is as follows:

a surface polishing treatment process for a bicycle frame comprises the following steps:

(1) ultrasonic-assisted dipping treatment of an ethanol solution:

soaking the bicycle frame in ethanol solution, stirring for 5-8min, soaking for 30-35min, taking out, and drying to constant weight;

(2) preparing a pretreatment solution:

dissolving tert-butyl alcohol in water to prepare a tert-butyl alcohol solution, then adding rare earth chloride into the tert-butyl alcohol solution, and uniformly stirring to obtain a pretreatment solution;

(3) and (3) pretreatment liquid treatment:

immersing the frame of the bicycle into the pretreatment liquid, then adding acetic anhydride and a catalyst into the pretreatment liquid, stirring for 1-1.5 hours at 50-55 ℃, then taking out the frame of the bicycle, washing the surface of the frame of the bicycle with clear water, and drying to constant weight;

(4) preparing a polishing solution:

sequentially adding sodium hydroxide and triethanolamine into water, stirring, adding copper sulfate and nitrate, and stirring for 15-20 min;

(5) polishing treatment:

immersing the pretreated bicycle frame into the polishing solution, heating to 60-62 ℃, soaking for 10s, then performing ultrasonic treatment for 5-8s, taking out, cleaning to be neutral by using clear water, and drying to be constant weight to obtain the polishing solution.

The mass fraction of the ethanol solution is 30 percent;

the stirring speed is 100 r/min.

The mass fraction of tertiary butanol in the pretreatment liquid is 10-12%;

the mass fraction of the rare earth chloride is 0.015-0.018%.

The rare earth chloride is lanthanum chloride.

The molar ratio of the acetic anhydride to the tert-butanol is 1: 1;

the mass ratio of the catalyst to the acetic anhydride is 1: 50.

The catalyst is dibutyltin dilaurate.

The concentration of sodium hydroxide in the polishing solution is 230-240 g/L;

the concentration of the triethanolamine is 80-90 g/L;

the concentration of the copper sulfate is 110-120 g/L;

the concentration of the nitrate is 255-260 g/L; the balance of water.

The nitrate is the mixture of sodium nitrate and ammonium ceric nitrate;

the mixing mass ratio of the sodium nitrate to the ammonium ceric nitrate is 50: 1.2-1.6.

The ultrasonic frequency is 40kHz, and the power is 550W.

Has the advantages that:

the invention provides a surface polishing treatment process for a bicycle frame, which comprises the steps of preparing a pretreatment solution, carrying out surface treatment on the bicycle frame, effectively improving the polishing efficiency of the bicycle frame in the polishing solution, further improving the polishing effect to a certain extent, and enhancing the surface brightness, wherein sodium nitrate and ammonium ceric nitrate are added into the polishing solution, so that nitrite ions can be generated in the polishing solution and react with aluminum protruding on the microscopic upper surface of a bicycle, the surface of the bicycle frame can be enabled to be smooth, and the brightening effect is achieved; by adding sodium hydroxide, the generated hydroxyl ions can level the surface of the bicycle frame and increase the brightness; by adding copper sulfate, copper ions generated by the copper sulfate can expand along with the convex surface of the bicycle frame surface in the polishing solution, and due to the fact that the surface of the bicycle frame is uneven, the local convex surface is covered by the copper ions and forms a plurality of micro-corrosion primary batteries with the convex points of the bicycle frame, under the promoting effect of ammonium cerium nitrate, the surface of the bicycle frame can be enabled to be smooth, the brightness is improved, the promoting effect of adding triethanolamine is utilized, the temperature required by the polishing solution treatment can be reduced, and the cost is saved.

Detailed Description

A surface polishing treatment process for a bicycle frame comprises the following steps:

(1) ultrasonic-assisted dipping treatment of an ethanol solution:

soaking the bicycle frame in ethanol solution, stirring for 5-8min, soaking for 30-35min, taking out, and drying to constant weight;

(2) preparing a pretreatment solution:

dissolving tert-butyl alcohol in water to prepare a tert-butyl alcohol solution, then adding rare earth chloride into the tert-butyl alcohol solution, and uniformly stirring to obtain a pretreatment solution;

physical data of tertiary butanol:

boiling point (oC, 101.3 kPa): 82.42, respectively;

melting point (oC): 25.7;

relative density (g/mL, 20/4 oC): 0.775;

refractive index (n 20 oC): 1.3878, respectively;

viscosity (mPa · s,30 oC): 3.35;

flash point (oC, open): 11.1;

ignition point (oC): 450 to 500 parts;

heat of evaporation (KJ/kg, b.p.): 546.3;

heat of fusion (KJ/kg): 91.6;

heat of combustion (KJ/kg): 35540, respectively;

specific heat capacity (KJ/(kg. K),27 oC, constant pressure): 3.04;

critical temperature (oC): 236;

critical pressure (MPa): 3.972, respectively;

boiling point rise constant: 8.37;

conductivity (S/m) 2.9 × 10^-7；

Lower explosion limit (%, V/V): 2.35;

upper explosion limit (%, V/V): 8;

vapor pressure (kPa, 20 oC): 4.08 of;

coefficient of volume expansion (K-1, 20 oC): 0.00133, respectively;

solubility: can be mixed with various organic solvents such as water, alcohol, ester, ether, aliphatic hydrocarbon, aromatic hydrocarbon and the like;

ordinary temperature refractive index (n 25): 1.382330, respectively;

relative density (25 ℃, 4 ℃): 0.775730, respectively;

(3) and (3) pretreatment liquid treatment:

immersing the frame of the bicycle into the pretreatment liquid, then adding acetic anhydride and a catalyst into the pretreatment liquid, stirring for 1-1.5 hours at 50-55 ℃, then taking out the frame of the bicycle, washing the surface of the frame of the bicycle with clear water, and drying to constant weight;

(4) preparing a polishing solution:

sequentially adding sodium hydroxide and triethanolamine into water, stirring, adding copper sulfate and nitrate, and stirring for 15-20 min;

(5) polishing treatment:

immersing the pretreated bicycle frame into the polishing solution, heating to 60-62 ℃, soaking for 10s, then performing ultrasonic treatment for 5-8s, taking out, cleaning to be neutral by using clear water, and drying to be constant weight to obtain the polishing solution.

The mass fraction of the ethanol solution is 30 percent;

the stirring speed is 100 r/min.

The mass fraction of tertiary butanol in the pretreatment liquid is 10-12%;

the mass fraction of the rare earth chloride is 0.015-0.018%.

The rare earth chloride is lanthanum chloride.

The molar ratio of the acetic anhydride to the tert-butanol is 1: 1;

the mass ratio of the catalyst to the acetic anhydride is 1: 50.

The catalyst is dibutyltin dilaurate.

The concentration of sodium hydroxide in the polishing solution is 230-240 g/L;

the concentration of the triethanolamine is 80-90 g/L;

the concentration of the copper sulfate is 110-120 g/L;

copper sulfate (copper sulfate), an inorganic compound, of the formula CuSO₄. Is white or off-white powder. The aqueous solution was weakly acidic and blue. But upon crystallization from aqueous solution, blue copper sulfate pentahydrate is formed;

the concentration of the nitrate is 255-260 g/L; the balance of water.

The nitrate is the mixture of sodium nitrate and ammonium ceric nitrate;

cerium ammonium nitrate:

linear formula: ce (NH)₄)₂(NO₃)₆

Melting point: 107 ℃ and 108 DEG C

Water solubility: 141 g/100 mL (25 ℃), 227 g/100 mL (80 ℃), readily soluble in water and ethanol, and practically insoluble in concentrated nitric acid;

density: 10 g/mL at 20 ℃;

the mixing mass ratio of the sodium nitrate to the ammonium ceric nitrate is 50: 1.2-1.6.

The ultrasonic frequency is 40kHz, and the power is 550W.

The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.