合金化热镀锌板阴极电泳针孔缺陷原因分析  

Reason analysis of pinhole defect formed on hot-dip zinc alloy coated steel sheet after cathodic electrophoretic coating

作　　者：姚士聪 孙鹏 颜晨曦 郝玉林 龙袁 YAO Shicong;SUN Peng;YAN Chenxi;HAO Yulin;LONG Yuan(Research Institute of Technology of Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing Shougang Co.,Ltd.,Beijing 100041,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]北京首钢股份有限公司,北京100041

出　　处：《电镀与涂饰》2022年第22期1621-1626,共6页Electroplating & Finishing

摘　　要：针对某主机厂HC180BD+ZF汽车外板电泳针孔缺陷原因进行分析。结果发现合金化热镀锌表面镀层铁含量越高,δ相含量越高,使其在磷化液的中活性越小,所得的磷化膜越薄,最终导致磷化后表面电阻低,在阴极电泳涂装过程中易出现火花放电现象,因而产生针孔缺陷。The reason for the formation of pinhole defects on electrophoretic coating of HC180BD+ZF plate from an original equipment manufacturer(OEM)was analyzed.It was found that the higher iron content in coating on the surface of hot-dip zinc alloy coated steel sheet was,the moreδphases it had,resulting in the formation of thinner phosphating film for its lower activity in phosphating solution.Spark discharge phenomenon occurred more easily on the thin phosphating film with low surface resistance during cathodic electrophoretic coating,leading to the formation of pinhole defects.

关 键 词：热浸镀 锌铁合金 铁含量 磷化 阴极电泳 针孔 形成机制 

分 类 号：TQ153.2[化学工程—电化学工业]