As an important means to extend the service life of automobiles, improve its power performance and improve the appearance of exterior decoration, electroplating process, with the rapid development of the automotive industry, puts forward more stringent quality requirements. Electroplating is also becoming more widely used in the automotive industry.
Shock absorber connecting rod
In the past, the damper connecting rod was electroplated with an Eth hard hard chrome process, and the corrosion resistance could not meet the requirements. Recently used HEEF25 microcrack chrome plating process, the thickness of the coating is 20±5μ; and the specification of 10l±3μ, the general requirement is 400-600 strips/cm, which is positive for ensuring the corrosion resistance and lubricity of the damper connecting rod. effect. The current density in this process has a significant relationship with the number of microcracks, crack morphology and amount of osmosis. The general control is at 58A/dm2. The design of the cylindrical anode and the polishing after plating have an impact on the quality.
bush
In order to prevent the Sn in the coating from forming a brittle phase by thermal diffusion from the body, on the bearing bush of the high-power engine, it is necessary to apply a nickel grid on the body, and replace the Pb-Sn binary with the electroplated Pb-Sn-Cu alloy. Alloy plating.
Piston, piston ring, connecting rod
The piston, piston ring and connecting rod are three-sport moving parts of the automobile engine, and the friction loss accounts for 40-50% of the total loss of the engine. Reducing the weight of the piston, piston ring and connecting rod and improving the friction environment have great significance for reducing engine vibration, noise and fuel consumption.
In the past, the piston did not perform any surface treatment or only chemical immersion tin (formation of the initial wear-in layer): the piston ring was chrome-plated and phosphatized: the connecting rod was only oxidized by the splicing of the phase; the bearing bush on the connecting rod was plated with Pb- Sn binary alloy and electroplating Sn treatment. These electroplated layers have not been able to meet the needs of modern engine speed, high power, compactness and ECR technology development.
Inlet and exhaust valve
The friction loss of the intake and exhaust valves is about 2% of the energy loss of the station engine. Measures to reduce losses: reduce the structural size of the inlet and outlet valves, and use a lightweight material port such as Zinc Alloy Heat-resistant steel. Working at 750 ° C high temperature, there is a smog in the engine exhaust gas, the Qin gas exhaust valve will undergo intense oxidation, potassium must be carried out on the surface, usually by spraying molybdenum, salt bath furnace nitriding treatment.
Recently, the treatment method that attracts people's attention is to treat the carburizing treatment. The process has little impact on the environment. The TiC hard layer formed on the surface is 50μm deeper than the permeation layer treated by the heat-resistant steel salt bath furnace, and the hardness reaches HV700. Oxidation, wear resistance, heat-resistant steel gas valve, the processing cost is more expensive than the salt bath furnace treatment.
Exhaust cylinder, silencer
The exhaust system installed in the chassis part of the vehicle is corroded by environmental impacts such as the impact of mud and sand, and is subjected to scouring and oxidative corrosion of high-temperature exhaust gas above 400 °C. The working environment is very harsh. The materials of the exhaust system are mostly made of stainless steel and hot-dip aluminum. In the process of use, the aluminum plate often occurs blackening and rusting of the coating. The corrosion test of the whole car has a grade 5 corrosion in 40 cycles, and the corrosion resistance is not as good as stainless steel. The addition of a silicon element cable to the hot-dip aluminum can suppress the growth of the iron-aluminum alloy layer and improve the processing performance. The service life of the hot-dip aluminum plate is related to the thickness of the coating, the molding process, and the operating temperature.
Car decoration
Modern car decoration parts are mostly made of plastic parts. Corrosion resistance, thermal shock resistance and decorative properties required for high-grade automotive plastic decorative plating parts are extremely high.
Shock absorber connecting rod
In the past, the damper connecting rod was electroplated with an Eth hard hard chrome process, and the corrosion resistance could not meet the requirements. Recently used HEEF25 microcrack chrome plating process, the thickness of the coating is 20±5μ; and the specification of 10l±3μ, the general requirement is 400-600 strips/cm, which is positive for ensuring the corrosion resistance and lubricity of the damper connecting rod. effect. The current density in this process has a significant relationship with the number of microcracks, crack morphology and amount of osmosis. The general control is at 58A/dm2. The design of the cylindrical anode and the polishing after plating have an impact on the quality.
bush
In order to prevent the Sn in the coating from forming a brittle phase by thermal diffusion from the body, on the bearing bush of the high-power engine, it is necessary to apply a nickel grid on the body, and replace the Pb-Sn binary with the electroplated Pb-Sn-Cu alloy. Alloy plating.
Piston, piston ring, connecting rod
The piston, piston ring and connecting rod are three-sport moving parts of the automobile engine, and the friction loss accounts for 40-50% of the total loss of the engine. Reducing the weight of the piston, piston ring and connecting rod and improving the friction environment have great significance for reducing engine vibration, noise and fuel consumption.
In the past, the piston did not perform any surface treatment or only chemical immersion tin (formation of the initial wear-in layer): the piston ring was chrome-plated and phosphatized: the connecting rod was only oxidized by the splicing of the phase; the bearing bush on the connecting rod was plated with Pb- Sn binary alloy and electroplating Sn treatment. These electroplated layers have not been able to meet the needs of modern engine speed, high power, compactness and ECR technology development.
Inlet and exhaust valve
The friction loss of the intake and exhaust valves is about 2% of the energy loss of the station engine. Measures to reduce losses: reduce the structural size of the inlet and outlet valves, and use a lightweight material port such as Zinc Alloy Heat-resistant steel. Working at 750 ° C high temperature, there is a smog in the engine exhaust gas, the Qin gas exhaust valve will undergo intense oxidation, potassium must be carried out on the surface, usually by spraying molybdenum, salt bath furnace nitriding treatment.
Recently, the treatment method that attracts people's attention is to treat the carburizing treatment. The process has little impact on the environment. The TiC hard layer formed on the surface is 50μm deeper than the permeation layer treated by the heat-resistant steel salt bath furnace, and the hardness reaches HV700. Oxidation, wear resistance, heat-resistant steel gas valve, the processing cost is more expensive than the salt bath furnace treatment.
Exhaust cylinder, silencer
The exhaust system installed in the chassis part of the vehicle is corroded by environmental impacts such as the impact of mud and sand, and is subjected to scouring and oxidative corrosion of high-temperature exhaust gas above 400 °C. The working environment is very harsh. The materials of the exhaust system are mostly made of stainless steel and hot-dip aluminum. In the process of use, the aluminum plate often occurs blackening and rusting of the coating. The corrosion test of the whole car has a grade 5 corrosion in 40 cycles, and the corrosion resistance is not as good as stainless steel. The addition of a silicon element cable to the hot-dip aluminum can suppress the growth of the iron-aluminum alloy layer and improve the processing performance. The service life of the hot-dip aluminum plate is related to the thickness of the coating, the molding process, and the operating temperature.
Car decoration
Modern car decoration parts are mostly made of plastic parts. Corrosion resistance, thermal shock resistance and decorative properties required for high-grade automotive plastic decorative plating parts are extremely high.
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