表面缺陷对镀层质量的影响

Influence of Surface State on Coating Quality

采用化学成分分析、扫描电镜及能谱分析、显微组织分析、电镀模拟试验等方法分析了活塞杆电镀成品表面针孔、麻点缺陷的形成原因,研究了待镀件表面缺陷对镀层质量的影响。结果表明:暴露于表层的非金属夹杂物、磨削裂纹及表面凹坑会造成该处镀层减薄甚至漏镀,形成针孔、麻点类缺陷。

The reasons of pinholes and pitting defects forming on electroplated piston rod surface were analyzed by chemical composition test, SEM, EDS, microstructure analysis and electroplate simulation test. The influence of surface defects of the product on the coating quality was studied. The results showed that nonmetallic inclusion exposed to the surface, grinding cracks and pits on the surface could alter the coating thickness, making it thin and skip plating, will form pinholes and pitting defect.