CN109355693B - Surface passivation chromatic aberration repair process for automobile bright decorative strip - Google Patents
Surface passivation chromatic aberration repair process for automobile bright decorative strip Download PDFInfo
- Publication number
- CN109355693B CN109355693B CN201811543456.7A CN201811543456A CN109355693B CN 109355693 B CN109355693 B CN 109355693B CN 201811543456 A CN201811543456 A CN 201811543456A CN 109355693 B CN109355693 B CN 109355693B
- Authority
- CN
- China
- Prior art keywords
- workpiece
- polishing
- decorative strip
- polishing solution
- electrolytic bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/24—Polishing of heavy metals of iron or steel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a surface passivation chromatic aberration repair process for an automobile bright decorative strip, which adopts plasma polishing to perform surface treatment on the bright decorative strip and comprises the following steps: s1, preparing a polishing solution which mainly comprises citric acid, sulfuric acid, sodium salt and glycerol, and the balance of additives, and adding the polishing solution into an electrolytic cell; s2, removing oil, pickling and washing the workpiece of the bright decorative strip to be processed, and finally drying the workpiece; s3, connecting the workpiece with an anode, clamping the workpiece by a tool clamp, immersing the workpiece into an electrolytic bath containing polishing solution, and carrying out plasma polishing on the workpiece by electrifying direct current with the bath body of the electrolytic bath as a cathode; s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3; and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, and drying or blow-drying the workpiece after cleaning. The polishing agent has the advantages of environment-friendly materials and low production cost, obviously improves the polishing performance of the surface of the bright decorative strip of the automobile, and has good glossiness.
Description
Technical Field
The invention relates to the field of automobile exterior trim processing, in particular to a process for repairing surface passivation chromatic aberration of an automobile bright trim.
Background
In recent years, with the steady development of economy in China, the living standard of people is greatly improved, and automobiles become necessary household articles. According to the latest data published by the Chinese industry network, the automobile holding amount in China is more than 2.17 hundred million by 2017, and the automobile holding amount is the most important worldwide. The large-scale growth of automobiles provides convenience for the lives of more and more people, and meanwhile, people have higher requirements on the appearance design and the performance of automobiles, and automobile exterior parts are just one of the requirements. The color of the current automobile exterior trimming part is basically the same as the color of the automobile body, the matching requirement of automobile manufacturers on the exterior trimming part and the automobile body is higher and higher in the production process, but the difference, namely the color difference, between the design colors of the exterior trimming part and the automobile body is caused to a certain extent due to different production modes of the exterior trimming part.
The color difference refers to the difference between a measured color and its standard color, which is also the difference between a color observed by the naked human eye and its standard color. It is known that the color elements mainly include hue, chroma and lightness, hue is an important characteristic for distinguishing colors from each other, hue is an element for mainly distinguishing chroma, chroma is a pure expression of a color, and lightness is a brightness of a color and is mainly related to the light reflection intensity of an object.
The color difference after the surface of the automobile bright decoration strip is passivated is mainly brightness, and more precisely the difference of the glossiness of the surface. The influencing factors of the color difference can be summarized into two aspects of passivated process parameters and raw materials. The influence on the process parameters comprises more passivation production process parameters, and the concentration, the soaking time, the product arrangement distance and the like of the passivation solution can have important influence on the paint yield. The stainless steel bright strip is passivated and has more or less deviation of chromatic aberration (glossiness), and a process is needed to make up for a great deal of defects generated by the stainless steel bright strip.
Therefore, those skilled in the art are devoted to developing a process for repairing the surface passivation color difference of the bright trim strip of the automobile to compensate for the deviation of the color difference.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is the color difference problem after the surface of the bright trim strip of the automobile is passivated.
In order to achieve the purpose, the invention provides a surface passivation chromatic aberration repair process for an automobile bright decorative strip, which adopts plasma polishing to carry out surface treatment on the bright decorative strip, and comprises the following steps:
s1, preparing a polishing solution, wherein the polishing solution comprises 15-20% of citric acid, 5-10% of sulfuric acid, 45-55% of sodium salt, 3-5% of glycerol and the balance of additives, adding the polishing solution into an electrolytic bath, controlling the concentration of the polishing solution to be 3.5-4.5% and the pH value to be 6.5-7.0, and heating and maintaining the temperature of the polishing solution to be 70-85 ℃;
s2, removing oil, pickling and washing the workpiece of the bright decorative strip to be processed, and finally drying the workpiece by oil-free purified compressed air;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool clamp, immersing the workpiece into an electrolytic bath containing polishing liquid, and carrying out plasma polishing on the workpiece by taking the electrolytic bath body as a cathode through direct current, wherein the submergence depth of the workpiece is 5-25mm, the space angle is 0 degrees, the operating voltage of the electrolytic bath is a forward pulse voltage of 230 plus 380V, the operating voltage frequency is 10K-20KHz, the current density is 30-80A/dm2, the duty ratio is 50-90%, and the polishing time is 20S-90S;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and then drying or blow-drying.
Further, the additive in the polishing solution comprises the following components: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid and 4g/L of OP emulsifier. The polishing solution additive composed of hexamethylenetetramine, polyethylene glycol, urea, sulfosalicylic acid and OP emulsifier mainly plays a role in activating the surface of a workpiece, can generate an adsorption mucosa on the surface of the workpiece to enhance the infiltration effect of the workpiece and the solution, also plays roles in inhibiting corrosion, brightening, defoaming and the like, can enable the reaction to be carried out stably, shows good brightening and leveling effects along with the plasma polishing, can enable the surface of the workpiece to be bright, and can clearly see the outline.
Further, the sodium salt is selected from one or more of sodium chloride, sodium carbonate, sodium nitrate, sodium sulfate, sodium sulfite, sodium acetate and sodium citrate.
Further, the composition of the degreasing solution is as follows: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier.
Preferably, the material adopted by the inner side of the clamp for clamping the workpiece is polytetrafluoroethylene, and the clamp is in close contact with the surface of the workpiece to prevent the surface of the workpiece from being ablated due to abnormal discharge. The polytetrafluoroethylene material has strong high temperature resistance and good chemical property, is used for being processed into a tool clamp, is in direct contact with the anode, has good corrosion resistance and insulation property, and avoids the ablation of energy released during electric discharge machining.
Preferably, the lowering is suspended and the workpiece is held at the contact position with the polishing liquid for 1 to 2 seconds, just after the workpiece is brought into contact with the polishing liquid. The moment when the workpiece and the polishing solution just start to contact is the moment when the contact area changes the most, at the moment, if the change is overlarge, the gas layer is not formed sufficiently, so that the current fluctuation is overlarge, the plasma polishing effect is easily influenced, and the influence can be reduced by adopting the technical scheme.
Further, the ratio of the area of the cathode to the area of the anode is 20-50: 1.
Further, the operating voltage of the electrolytic cell is a positive square wave pulse voltage. The square wave can provide concentrated energy to be applied to the workpiece, and can excite plasma on the surface of the workpiece to form an air film to isolate the workpiece from electrolyte in a very short time, so that the workpiece is subjected to plasma bombardment effect at the maximum efficiency, and the polishing effect is realized. The higher the frequency, that is, the shorter the gap time of each pulse square wave, the plasma gas film caused by the previous square wave is just regressed, and the new gas film is excited by the next square wave, so that a continuous gas film can be almost formed, and the polishing effect of the workpiece is better.
Furthermore, a circulating pump is added in the electrolytic bath to drive the polishing solution to perform forced circulation flow, and the flow rate of the polishing solution is controlled to be 1.8-2.8L/min. The reasonable flow velocity of the polishing solution is controlled, the amount of the polishing solution contacting the surface of the workpiece can be increased, so that the polishing efficiency and the polishing effect are improved, and the excessive flow enables turbulence and bubbles to be generated in the electrolytic cell, so that the surface of the workpiece forms foamy liquid, a stable gas layer is difficult to generate, and the polishing effect of the surface of the workpiece is influenced.
In a preferred embodiment of the present invention, the polishing solution comprises the following components in percentage by weight: 17% of citric acid, 6% of sulfuric acid, 55% of sodium sulfate, 4% of glycerol and the balance of additives; the concentration of the polishing solution was 4.5%, the pH was 7.0, and the temperature was 80 ℃.
During the process of feeding the workpiece into the polishing solution, gas generated by the electrolysis of the polishing solution and water vapor evaporated by the instantaneous short circuit at the contact position of the workpiece and the polishing solution form a gas layer surrounding the workpiece, and the workpiece is completely separated from the polishing solution. Because the electric field intensity at the position of the microscopic bulge is high, after the gas layer enters a plasma state under the action of direct current voltage, a discharge channel is preferentially formed at the position of the microscopic bulge, and materials at the positions are removed, so that the workpiece is polished.
The polishing solution contains citric acid, sulfuric acid and glycerol, wherein the citric acid has low acidity and high viscosity, can play a role in dissolution in the polishing process and can form a passivation film on the surface of stainless steel to prevent the stainless steel from being over-corroded; the sulfuric acid has good dispersibility, can be completely ionized in the solution, is beneficial to improving the conductivity, the dispersing capacity and the anode current efficiency of the polishing solution, and enables the surface of the stainless steel to be polished uniformly; after heating, the etching ability of sulfuric acid is greatly improved, which contributes to the formation of a diffusion layer. The glycerol is adsorbed on the surface of the anode, which is beneficial to promoting the formation of a diffusion layer, and can form a layer of film on the surface of the stainless steel with the citric acid, thereby preventing the stainless steel from being over-corroded and enabling the polished surface of the stainless steel to be bright and fine.
The concentration of the polishing solution is controlled to be 3.5-4.5% by mass concentration, the increase of the concentration of the polishing solution can often aggravate the plasma chemical reaction between a gas layer and the surface of a workpiece, although theoretically, all the products are discharged and removed without influencing the roughness after polishing, the brightness of the surface of the polished workpiece can be reduced by trace reactant residues, and simultaneously, once the concentration reaches a certain degree, the problems of pollution and waste liquid can be encountered.
The pH value of the prepared polishing solution is 6.5-7.0, the prepared polishing solution is weakly acidic, the corrosion effect of the acidic solution on the workpiece is utilized, and in the plasma polishing process, the acid washing solution preferentially corrodes the convex part on the surface of the workpiece, so that the workpiece with better surface roughness is finally obtained. If the acidity is strong, the corrosion is too fast, which easily causes over-corrosion. On the other hand, the corrosion effect is not beneficial to improving the surface reflectivity of the workpiece, so that the best polishing effect can be realized only by combining the plasma effect and carrying out balanced regulation and control on the plasma effect and the workpiece.
Under the process condition of the invention, the total time of plasma polishing is set to be 30s-2min more effectively, the polishing time is too long, the surface of a workpiece is easily over-corroded by acid solution, the polishing time is too short, the plasma bombardment effect is not obvious enough, the surface brightness of the workpiece is not enough, and the color difference repairing effect is poor.
The polishing liquid is kept at the temperature of 70-85 ℃, when the temperature of the polishing liquid is not more than 80 ℃, the roughness value of the polished surface is reduced along with the increase of the temperature of the polishing liquid, and the roughness value is obviously increased after the temperature of the polishing liquid exceeds 80 ℃, so that the current density is presumed to be reduced along with the increase of the temperature of the polishing liquid, and at higher temperature, due to the local boiling of the polishing liquid, the gas layer loses the initial size and shape of the gas layer, the whole workpiece is in continuously moving foam, the polishing efficiency is obviously reduced, and the brightness of the processed surface is also reduced. Therefore, the temperature of the polishing liquid is preferably 80 ℃.
Because the bright decoration strip workpiece has a certain thickness, the polishing strength is lower on one side close to the liquid level under the condition of shallow submerging depth, so that the polishing is divided into two stages to be carried out under the condition of requiring uniform polishing of the surface and avoiding the polishing effect difference of positions with different vertical heights, namely, the workpiece is taken out when the polishing is carried out for half, and is continuously immersed into an electrolytic tank for polishing after rotating 180 degrees.
Compared with the traditional polishing process, the process of the invention has the advantages that:
1. the environmental protection pressure is reduced. The used polishing solution is very environment-friendly, the waste liquid can be directly discharged without causing pollution, can also be slightly treated and recycled, has low processing cost, is beneficial to popularization, has no pollution to the processing environment, and adapts to the development direction of green manufacturing;
2. the production cost is reduced. The semi-automatic and full-automatic environment-friendly plasma nano polishing equipment adopts automatic control, is simple to operate and convenient to maintain, reduces operating personnel and labor cost. Meanwhile, a lot of material consumption caused by traditional polishing methods such as manual polishing, electrolytic polishing, chemical polishing and the like can be saved for customers;
3. the production efficiency is improved. The semi-automatic and full-automatic environment-friendly plasma nano polishing equipment can achieve the effect of electroplating a mirror surface within ten seconds to two minutes by using a special medicament, so that the production efficiency is greatly improved;
4. the polishing effect is good, and the product quality is improved. The product polished by the semi-automatic and full-automatic environment-friendly plasma nano polishing equipment has high quality, and can polish some precision workpieces which cannot be polished manually. The precision control is extremely high, the size influence is small, the precision can be controlled to be 0.1 micron/minute generally, the polishing is uniform, and the surface and the dead angle of the whole workpiece can achieve the consistent mirror surface effect. The corrosion resistance of the polished surface is enhanced, and a layer of passive film is generated on the surface of the workpiece in the polishing process, so that the workpiece keeps durable and bright and is effectively prevented from being oxidized. High purity and effectively reduced contamination to electronic products. The characteristics of the polished product are mainly shown in the following steps: reduced roughness, improved smoothness and precision, hardness, durability, reduced notch sensitivity, smoothness, regularity, reduced friction coefficient, reduced wear, and the like.
The conception, technical solution and technical effects of the present invention will be further described with reference to the following embodiments, so as to fully understand the objects, features and effects of the present invention.
Detailed Description
Example 1
A surface passivation color difference repairing process for an automobile bright decorative strip comprises the following steps:
s1, preparing a polishing solution according to the following components: 15% of citric acid, 5% of sulfuric acid, 55% of sodium sulfate, 3% of glycerin and the balance of additives, wherein the additives comprise: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid, 4g/L of OP emulsifier, 3.5 wt% of concentration of polishing solution and 6.5 of PH value, adding the polishing solution into an electrolytic bath, arranging a conventional heating and temperature control device in the electrolytic bath, and heating and maintaining the temperature of the polishing solution at 70 ℃;
s2, degreasing, pickling and washing the workpiece of the bright decorative strip to be processed to remove impurities on the surface of the workpiece, wherein the degreasing solution comprises the following components: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier, wherein the acid washing and the water washing adopt the prior technical means, and finally the oil-free purification compressed air is used for drying by cold wind;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool clamp, immersing the workpiece into an electrolytic tank containing polishing liquid, carrying out plasma polishing on the workpiece by taking the electrolytic tank body as a cathode and electrifying a direct current to the electrode, wherein the submergence depth of the workpiece is 5mm, the space angle is 0 degree, and the electrolytic tank is operatedThe voltage is 230V, the operating voltage frequency is 10KKHz, and the current density is 30A/dm2The duty ratio is 90%, the ratio of the area of the cathode to the area of the anode is 20:1, and the polishing time is 20 s;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and drying by using an oven or drying by using compressed air.
Preferably, the inner side of the tool clamp is made of polytetrafluoroethylene, the tool clamp is tightly contacted with the surface of a workpiece to prevent the surface of the workpiece from being ablated due to abnormal discharge, and the workpiece is temporarily suspended to descend and is kept at the contact position of the workpiece and the polishing solution for 1-2s when the workpiece is just contacted with the polishing solution.
Example 2
The surface passivation color difference repair process for the bright trim strip of the automobile comprises the following steps:
s1, preparing a polishing solution according to the following components: 20% of citric acid, 10% of sulfuric acid, 45% of sodium salt consisting of sodium sulfite and sodium citrate, 5% of glycerol and the balance of additives, wherein the additives consist of: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid, 4g/L of OP emulsifier, 4.5% of concentration of polishing solution and 7.0 of PH value, adding the polishing solution into an electrolytic bath, arranging a conventional heating and temperature control device in the electrolytic bath, and heating and maintaining the temperature of the polishing solution at 80 ℃;
s2, degreasing, pickling and washing the workpiece of the bright decorative strip to be processed to remove impurities on the surface of the workpiece, wherein the degreasing solution comprises the following components: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier, and finally drying by using compressed air without oil purification;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool, immersing the workpiece into an electrolytic bath containing polishing solution, carrying out plasma polishing on the workpiece by taking the electrolytic bath body as a cathode and supplying direct current, wherein the submergence depth of the workpiece is 25mm and the space angle is 0 degree during polishing,the operating voltage of the electrolytic cell is a positive square wave pulse voltage of 380V, the operating voltage frequency is 20KHz, and the current density is 80A/dm2The duty ratio is 70%, the ratio of the area of the cathode to the area of the anode is 50:1, and the polishing time is 90 s;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and then drying or blow-drying.
Example 3
The surface passivation color difference repair process for the bright trim strip of the automobile comprises the following steps:
s1, preparing a polishing solution according to the following components: 16% of citric acid, 7% of sulfuric acid, 50% of sodium salt consisting of sodium sulfate and sodium citrate, 5% of glycerin and the balance of additives, wherein the additives consist of: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid, 4g/L of OP emulsifier, 3.5% of concentration of polishing solution and 7.0 of PH value, adding the polishing solution into an electrolytic bath, arranging a conventional heating and temperature control device in the electrolytic bath, and heating and maintaining the temperature of the polishing solution at 85 ℃;
s2, degreasing, pickling and washing the workpiece of the bright decorative strip to be processed to remove impurities on the surface of the workpiece, wherein the degreasing solution comprises the following components: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier, and finally drying by using compressed air without oil purification;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool, immersing the workpiece in an electrolytic tank containing polishing liquid, and carrying out plasma polishing on the workpiece by taking the electrolytic tank body as a cathode and supplying direct current, wherein the submergence depth of the workpiece is 10mm, the space angle is 0 degree, the operating voltage of the electrolytic tank is a positive square wave pulse voltage of 380V, the operating voltage frequency is 10KKHz, and the current density is 50A/dm2The duty ratio is 62%, the ratio of the area of the cathode to the area of the anode is 30:1, the polishing time is 20s, a circulating pump is added in the electrolytic bath to drive the polishing solution to perform forced circulation flow, and the flow rate of the polishing solution is controlled to be 1.8L/min;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and then drying or blow-drying.
Example 4
The surface passivation color difference repair process for the bright trim strip of the automobile comprises the following steps:
s1, preparing a polishing solution according to the following components: 17% of citric acid, 6% of sulfuric acid, 55% of sodium sulfate, 4% of glycerin and the balance of additives, wherein the additives comprise: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid, 4g/L of OP emulsifier, 4% of concentration of polishing solution and 7.0 of PH value, adding the polishing solution into an electrolytic bath, wherein a conventional heating and temperature control device is arranged in the electrolytic bath, and the polishing solution is heated and kept at the temperature of 80 ℃;
s2, degreasing, pickling and washing the workpiece of the bright decorative strip to be processed to remove impurities on the surface of the workpiece, wherein the degreasing solution comprises the following components: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier, and finally drying by using compressed air without oil purification;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool, immersing the workpiece into an electrolytic tank containing polishing liquid, and carrying out plasma polishing on the workpiece by using the electrolytic tank body as a cathode and supplying direct current, wherein the submergence depth of the workpiece is 5mm, the space angle is 0 degrees, the operating voltage of the electrolytic tank is 380V positive square wave pulse voltage, the operating voltage frequency is 10KHz, and the current density is 50A/dm2The duty ratio is 60%, the ratio of the area of the cathode to the area of the anode is 30:1, the polishing time is 90s, a circulating pump is added in the electrolytic bath to drive the polishing solution to perform forced circulation flow, and the flow rate of the polishing solution is controlled to be 2.8L/min;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and then drying or blow-drying.
Example 5
The surface passivation color difference repair process for the bright trim strip of the automobile comprises the following steps:
s1, preparing a polishing solution according to the following components: 17% of citric acid, 6% of sulfuric acid, 55% of sodium sulfate, 4% of glycerin and the balance of additives, wherein the additives comprise: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid, 4g/L of OP emulsifier, 4.5% of concentration of polishing solution and 7.0 of PH value, adding the polishing solution into an electrolytic bath, arranging a conventional heating and temperature control device in the electrolytic bath, and heating and maintaining the temperature of the polishing solution at 80 ℃;
s2, degreasing, pickling and washing the workpiece of the bright decorative strip to be processed to remove impurities on the surface of the workpiece, wherein the degreasing solution comprises the following components: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier, and finally drying by using compressed air without oil purification;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool, immersing the workpiece into an electrolytic tank containing polishing liquid, and carrying out plasma polishing on the workpiece by using the electrolytic tank body as a cathode and supplying direct current, wherein the submergence depth of the workpiece is 5mm, the space angle is 0 degrees, the operating voltage of the electrolytic tank is a positive square wave pulse voltage of 380V, the operating voltage frequency is 10K, and the current density is 50A/dm2The duty ratio is 60%, the ratio of the area of the cathode to the area of the anode is 30:1, the polishing time is 60s, a circulating pump is added in the electrolytic bath to drive the polishing solution to perform forced circulation flow, and the flow rate of the polishing solution is controlled to be 2.5L/min;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and then drying or blow-drying.
Measurement of polishing Property
The polishing performance of the automobile bright decorative strip obtained by the process treatment of the embodiment is measured, and the measurement mainly comprises the measurement of surface roughness and glossiness. And (3) carrying out surface roughness test on each treated workpiece by adopting a TR200 roughness meter, and measuring the glossiness of the surface of the workpiece by adopting a glossmeter. The results of the property measurements are shown in Table 1
Table 1:
as can be seen from the data in Table 1, the repairing process can obviously improve the polishing performance of the surface of the bright decorative strip of the automobile, and the glossiness of the sample reaches over 1000 GU. The automobile bright decorative strip repaired by the method can make up for the color difference after passivation and improve the product quality.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. The surface passivation chromatic aberration repair process for the bright decorative strip of the automobile is characterized in that plasma polishing is adopted to carry out surface treatment on the bright decorative strip, and comprises the following steps:
s1, preparing a polishing solution, wherein the polishing solution comprises 17% of citric acid, 6% of sulfuric acid, 55% of sodium salt, 4% of glycerol and the balance of additives, and the additives comprise: 4g/L of hexamethylenetetramine, 10g/L of polyethylene glycol, 10g/L of urea, 5g/L of sulfosalicylic acid and 4g/L of OP emulsifier, adding the polishing solution into an electrolytic bath, controlling the concentration of the polishing solution to be 4.5%, and heating and keeping the temperature of the polishing solution at 80 ℃ according to the mass concentration and the pH value of 7.0;
s2, removing oil, pickling and washing the workpiece of the bright decorative strip to be processed, and finally drying the workpiece by oil-free purified compressed air;
s3, connecting the workpiece with an anode, clamping the workpiece by a tool clamp, immersing the workpiece into an electrolytic bath containing polishing liquid, and carrying out plasma polishing on the workpiece by taking the electrolytic bath body as a cathode through direct current, wherein the submergence depth of the workpiece is 5-25mm, the space angle is 0 degrees, the operating voltage of the electrolytic bath is a forward pulse voltage of 230 plus 380V, the operating voltage frequency is 10K-20KHz, and the current density is 30-80A/dm2The duty ratio is 50-90%, the polishing time is 20-90 s, a circulating pump is added in the electrolytic bath to drive the polishing solution to perform forced circulation flow, and the flow rate of the polishing solution is controlled to be 1.8-2.8L/min;
connecting a workpiece with an anode, turning on a working power supply after the workpiece is clamped by a tool clamp, and suspending descending and keeping the workpiece at a contact position of the workpiece and the polishing solution for 1-2s when the workpiece and the polishing solution just start to contact; the operation voltage of the electrolytic bath is positive square wave pulse voltage;
s4, taking out the workpiece, turning the upper surface and the lower surface by 180 degrees, immersing the workpiece into the electrolytic bath again, and performing plasma polishing under the same operation condition of S3;
and S5, after the polishing of the workpiece is finished, turning off the power supply, taking out the workpiece, immersing the workpiece in a pure water tank for ultrasonic cleaning, and then drying or blow-drying.
2. The repair process for surface passivation color difference of automobile bright decorative strip according to claim 1, wherein the sodium salt is selected from one or more of sodium chloride, sodium carbonate, sodium nitrate, sodium sulfate, sodium sulfite, sodium acetate and sodium citrate.
3. The surface passivation color difference repair process of the automobile bright decorative strip according to claim 1, characterized in that the oil removing solution comprises the following components: 20g/L of sodium hydroxide, 30g/L of sodium carbonate, 50g/L of trisodium carbonate and 5mL/L of OP emulsifier.
4. The surface passivation color difference repair process for the automobile bright decorative strip as claimed in claim 1, wherein the material adopted by the inner side of the clamp for clamping the workpiece is polytetrafluoroethylene, and the clamp is in close contact with the surface of the workpiece to prevent the surface of the workpiece from being ablated due to abnormal discharge.
5. The repair process for surface passivation color difference of automobile bright decoration strip according to claim 1, wherein the ratio of the area of the cathode to the area of the anode is 20-50: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543456.7A CN109355693B (en) | 2018-12-17 | 2018-12-17 | Surface passivation chromatic aberration repair process for automobile bright decorative strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543456.7A CN109355693B (en) | 2018-12-17 | 2018-12-17 | Surface passivation chromatic aberration repair process for automobile bright decorative strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109355693A CN109355693A (en) | 2019-02-19 |
| CN109355693B true CN109355693B (en) | 2020-08-18 |
Family
ID=65328980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811543456.7A Active CN109355693B (en) | 2018-12-17 | 2018-12-17 | Surface passivation chromatic aberration repair process for automobile bright decorative strip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109355693B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020206492A1 (en) | 2019-04-09 | 2020-10-15 | 3DM Biomedical Pty Ltd | Electropolishing method |
| CN111001621A (en) * | 2019-11-15 | 2020-04-14 | 常州市固歌光电有限公司 | Surface treatment process for automobile lamp |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591798B (en) * | 2008-06-01 | 2011-04-20 | 比亚迪股份有限公司 | Metal piece and method for processing surface of metal piece |
| CN102516887B (en) * | 2011-11-24 | 2014-01-08 | 珠海承鸥卫浴用品有限公司 | Polishing solution and plasma polishing process |
| CN108070899A (en) * | 2017-12-20 | 2018-05-25 | 深圳市锆安材料科技有限公司 | A kind of non-crystaline amorphous metal local polishing technique |
-
2018
- 2018-12-17 CN CN201811543456.7A patent/CN109355693B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109355693A (en) | 2019-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109355693B (en) | Surface passivation chromatic aberration repair process for automobile bright decorative strip | |
| CN101845662A (en) | Magnesium alloy surface treating method and magnesium alloy polished by same | |
| CN102953114A (en) | Stainless steel product and preparation method thereof | |
| CN110846711A (en) | Precise stainless steel pipe electrolytic polishing process and electrolyte thereof | |
| CN110629227A (en) | Electrolyte plasma polishing solution and polishing process for coinage copper alloy blank cake | |
| KR100695999B1 (en) | Anodizing method for matal surface using high-frequency pluse | |
| CN109396200A (en) | A kind of production technology coating the big specification wire pre-treatment of copper clad steel | |
| CN105887178A (en) | Plasma aluminum alloy polishing salt preparation and polishing method | |
| CN112609219A (en) | Bath solution for red anodic oxidation of aluminum alloy material and process method | |
| CN111778532A (en) | Alkaline zinc-nickel electroplating method for lock ring and embedded ring of automobile fuel tank | |
| US4148707A (en) | Electrochemical finishing of stainless steel | |
| CN106637377B (en) | Nickel-base alloy electrolytic polishing liquid and its polishing method | |
| CN117344366A (en) | Electrolyte plasma polishing solution for aluminum-magnesium-scandium alloy and polishing process based on same | |
| CN115161733B (en) | Surface treatment structure of aluminum alloy and preparation method thereof | |
| US4118301A (en) | Apparatus for electrochemical finishing of stainless steel | |
| CN101492833A (en) | Production process for electric slurry polishing | |
| US2607722A (en) | Electrolytic polishing of stainless steel | |
| CN106769354B (en) | Polishing method for aluminium alloy metallographic specimen | |
| KR20100085704A (en) | Method on surface treatment of aluminium material | |
| CN107988627A (en) | One kind 2 is aluminium section bar electrochemical polishing treatment technique | |
| CN113913916A (en) | Method for removing oxide skin on surface of titanium alloy | |
| CN104032363A (en) | Phosphoric-acid-free electrochemical polishing process for siliceous aluminum alloy | |
| KR20100085702A (en) | Method on printing on the surface of treated aluminium material | |
| CN111979565A (en) | Method for electroplating microporous nanocrystalline hard chromium layer | |
| CN104032365B (en) | Formula and process aiming at electrolytic polishing of siliceous aluminum alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |