镀层厚度对热镀锌热轧板耐蚀性的影响  

Effect of Coating Thickness on Corrosion Resistance of Hot Galvanized Plate

作　　者：侯蓉[1,2] 徐光[1] 戴方钦[1] 马国和 柯江军 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]湖北省高性能钢铁材料协同创新中心,湖北武汉430081 [3]黄石山力科技股份有限公司,湖北黄石435003 [4]黄石山力兴冶薄板有限公司,湖北黄石435100

出　　处：《材料保护》2017年第6期5-8,26,共5页Materials Protection

基　　金：国家高技术研究发展计划(863计划)项目(2012AA03A504)资助

摘　　要：为模拟热镀锌板的实际使用情况,以剪裁后不同镀层厚度的热镀锌热轧板为研究对象,采用光学显微镜(OM)观察镀锌前后基体组织,通过中性盐雾试验分析镀层厚度对热镀锌热轧板产生白锈和红锈的影响规律。结果表明:在腐蚀过程中,腐蚀沿镀层由四周向内部扩展,同时由钢基体向表面扩展和锌层表面向内部扩展;随着镀层厚度增加,腐蚀扩展时间增长导致腐蚀时间增长,热镀锌板抗白锈能力增强,意味着耐蚀寿命增加;但抗白锈能力与镀层厚度呈非线性关系,涂层较厚时,通过增加镀层厚度提高热镀锌板抗白锈能力的效率降低。For simulating the actual usage of galvanized plates,using the clipped hot galvanized plates with different coating thickness as subjects,the structures of plate substrate before and after galvanization were observed by optical microscope （OM）,and the influencing mechanism of coating thickness on white rust and red rust of galvanized plates was analyzed by salt spray experiment.Results showed that during the corrosion process,the corrosion extended from surrounding to the internal,from the matrix of steel to the surface and from the zinc layer surface to the internal.With the increase of coating thickness,the longer expansion time of corrosion caused longer corrosion time,leading to the stronger ability of resisting white rust of galvanized plates,which indicated that the corrosion resistance life was improved.However,the relationship between the corrosion resistance life and coating thickness was nonlinear,and when the coating was too thick,the efficiency of improving corrosion resistance life was decreased by increasing coating thickness.

关 键 词：镀层厚度 热镀锌 热轧板 耐蚀性 

分 类 号：TG174.443[金属学及工艺—金属表面处理]