45Mn钢件表面电镀霉斑的形成原因分析

针对45Mn钢件表面电镀出现的霉斑现象,分析了钢板的化学成分、原始组织及表面质量。结果表明,钢的化学成分和微观组织未见异常,满足标准要求,但钢板表面粗糙、氧化脱碳严重,形成微裂纹是电镀不合格的主要原因。通过优化生产工艺,提高表面质量,可以避免电镀霉斑的形成。

Formation cause analysis of electroplating mildew spot on 45Mn steel part surface

Formation causes of electroplating mildew spot on 45Mn steel part surface was analyzed by studying the chemical composition, original microstructure and surface quality of the part and the raw steel sheet. The results show that both the chemical composition and the microstructure of the raw steel sheet meet the standard requirements and without abnormality. However, the roughening of the steel surface and the existence of carbon segregation defects lead to microcracks on the electroplating steel surface, which are the main reasons for the electric plating defects. Through optimizing the production process and improving the surface quality, the formation of the mildew spot on the surface of electroplating steel part can be avoided.