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对用两种不同的电镀工艺制备的汽车减振器连杆进行了电解腐蚀试验 ,探讨了减振器连杆镀铬层点蚀的形成机理及其对连杆表面耐腐蚀性的影响。运用金相显微镜及扫描电镜观察腐蚀前后连杆的镀铬层组织 ,证实连杆的表面镀层缺陷是影响其耐腐蚀性的主要原因。电镀工艺中减小电流密度可以减小镀层裂纹宽度和深度 ,从而提高镀层的耐蚀性
Electrolytic corrosion test was conducted on the connecting rod of automobile shock absorber prepared by two different electroplating processes. The formation mechanism of pitting corrosion on the chrome plating layer of shock absorber and its influence on the corrosion resistance of the connecting rod surface were discussed. Using metallographic microscope and scanning electron microscopy to observe the chrome layer structure before and after the corrosion of the connecting rod, it is confirmed that the surface coating of the connecting rod is the main reason that affects the corrosion resistance. Reducing the current density in the electroplating process can reduce the width and depth of the crack in the coating, thereby increasing the corrosion resistance of the coating