Application Of Plastic Electroplating-Electroplating Process in Automobile Industry

Application of plastic Electroplating-Electroplating process in Automobile Industry.
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. Electroplating is more and more widely used in the automobile industry.
Shock absorber connecting rod.
In the past, the connecting rod of shock absorber was electroplated with hard chromium, and its corrosion resistance could not meet the requirements. The HEEF25 micro-crack chromium plating process is adopted a few days ago, the thickness of the coating is 20 ±5 μ, compared with 101 ±3 μ, the number of cracks is generally required to be 400-600 / cm, which plays a positive role in ensuring the corrosion resistance and lubricity of the shock absorber connecting rod. In this process, the current density is obviously related to the number of microcracks, the shape of cracks and the amount of infiltration atmosphere. It is generally controlled in 58A/dm2. The design of the tubular anode and the polishing after plating have an effect on the quality.
Bearing bush.
In order to prevent the thermal diffusion of Sn in the coating to the slave body to form a brittle phase, a nickel gate needs to be plated on the bearing bush of the high-power engine, and the Pb-Sn-Cu alloy coating is used instead of Pb-Sn binary alloy coating.
Piston, piston ring, connecting rod.
Piston, piston ring and connecting rod are three moving parts of automobile engine, and their friction losses account for about 40-50% of the total loss of the engine. Reducing the weight of piston, piston ring and connecting rod and improving their friction environment are of great significance to reduce engine vibration, noise and fuel consumption.
In the past, the piston did not carry out any surface treatment or only chemical tin dipping (the initial running-in layer was formed): the piston ring was plated with chromium and phosphating: the connecting rod was oxidized with only one screw; the bearing on the connecting rod was electroplated with Pb-Sn binary alloy and electroplated with Sn. These electroplated coatings can no longer meet the needs of high speed, high power, compact and ECR technology development of modern engines.
Intake and exhaust valve.
The friction loss of intake and exhaust valves is about 2% of the energy loss of the station engine. Measures to reduce the loss: reduce the structural size of intake and exhaust valves, the use of lightweight materials such as the use of Qin alloy Depu heat-resistant steel. Working at a high temperature of 750 ℃ and the friction detection of scales from the engine exhaust gas, the imperial exhaust valve will undergo fierce oxidation, and potassium must be carried out on the surface, which is usually treated by molybdenum injection and salt bath furnace nitriding.
. Oxidation resistance, wear resistance, heat-resistant steel valve, the treatment cost is more expensive than salt bath furnace treatment.
Exhaust cylinder, silencer.
The exhaust system installed in the automobile chassis is not only corroded by the impact of road mud and sand, but also eroded and oxidized by high temperature waste gas above 400 ℃. The working environment is very bad. The materials of exhaust system are mostly stainless steel and hot-dip aluminized plate. In the process of working and using, the coating blackening and corrosion often occur on the aluminized plate. The corrosion resistance test of the whole vehicle has grade 5 corrosion in 40 cycles, and the corrosion resistance is not as good as that of stainless steel. The addition of silicon element cable to hot-dip aluminizing can restrain the growth of Fe-Al alloy layer and improve the processability. The service life of hot-dip aluminized sheet is related to the thickness of coating, forming process and working temperature.
Automobile decoration parts.
Most of the decorative parts of modern cars are plastic parts. High-grade automobile plastic decorative electroplating parts require extremely high corrosion resistance, thermal vibration resistance and decoration.