汽车减振器连杆镀铬层的吸氢与耐腐蚀性能

Hydrogen-Absorbing and Erosion Resistance of Piston Rods in Automobile Shock Absorber during Fast Chromium Plating

针对汽车减振器连杆高效镀铬工艺在高电流密度条件下因镀层吸氢量大而引起的耐腐蚀性能差的问题 ,研究了电流密度与镀层组织及耐腐蚀性能的关系 .动用扩散理论得到了电流密度与镀层氢含量的关系曲线 .试验证明 ,在 J=5 8A/dm2 的工艺条件下镀层含氢量小 ,吸氢速度平缓 ,此时的镀层耐腐蚀性最好 .研究结果对汽车减振器连杆电镀生产工艺的改进提供了理论依据 。

A large amount of hydrogen absorbed in the chromium plating layers decrease the erosion resistance of piston rods, treated by the fast chromium plating process with a high current density. Concentrating on this problem, the relationship among the current density, microstructure of chromium plating layers and erosion resistance property was investigated. The relation between the current density and hydrogen content of the chromium plating layers was established using the diffusion theories. It was derived that chromium plating layers would absorb less hydrogen and the hydrogen absorbing speed is relatively slow in the fast chromium plating process with a current density of 58 A/dm2, and then the erosion resistance of the layers is the best. It provides a theoretical basis for optimizing the plating process of piston rods for automobile shock absorbers, which is applicable in engineering.