摘要
利用扫描电镜(SEM)和能谱仪(EDS)对合金化热镀锌(GA)板表面出现的黑斑缺陷进行了测试。黑斑处表面和截面均为氧元素含量较高,生成了ZnO腐蚀产物且黑斑处整个镀层均被氧化腐蚀;黑斑处镀层厚度比正常部位要厚,镀层有一定体积增加现象。研究结果表明,导致板面黑斑的主要原因是合金化热镀锌(GA)板表面局部粘附有某种电解腐蚀液加速了电化学腐蚀过程。
The black spot defects of continuous hot dip galvanized strip steel were analyzed by SEM and EDS.There were high oxygen contents in black spots from the surface and cross section,the ZnO corrosion products were produced and the whole coating was oxidized and corroded.There was a certain increase in the coating thickness at the black spot than at the other position.The results show that the main reasons for the black spot of the Galvanizing Alloying(GA)steel strip are that there were certain electrolytic corrosive solution on its surface,and this accelerated electrochemical corrosion process.
出处
《材料科学》
CAS
2019年第9期829-834,共6页
Material Sciences
基金
国家自然科学基金(NO:51771139)。
