摘要
针对汽车工业急待解决的连杆腐蚀裂纹造成的减振器失效问题,对腐蚀裂纹建立了毛细管模型,试验研究了不同电流密度高效镀铬条件下减振器连杆镀层的微裂纹特征和腐蚀裂纹扩展规律.结果表明:电流密度为58A/dm2时镀铬层微裂纹数量多且细密,在此电流密度下由于腐蚀电流的分散连杆基体的耐蚀性较好;镀铬层极化电流密度和裂纹长径比呈双曲线关系,电流密度为58A/dm2时镀层腐蚀裂纹短而浅,耐腐蚀性能好.
After model building, microcracks in the surface of the Chromium plating layers of piston rods in automobile shock absorbers and cross-section erosion cracks in the Chromium plating layers was investigated through salt spray test. The result shows that the Chromium plating layers treated in the current density (58 A/dm^2) have a large number of microcracks which are reticular distributed and protect piston rods effectively because of the diffusion of erosion current. The relation between polarizing current density of Chromium plating layers and slenderness ratio (x/r) is hyperbolic. The erosion cracks of current density 58 A/dm^2 are short and shallow and the Chromium plating layers have the best performance of corrosion resistance.
出处
《材料科学与工艺》
EI
CAS
CSCD
2003年第4期438-440,共3页
Materials Science and Technology
