钢材热浸镀双镀法工艺优化与缺陷  

Process Optimization and Defect of Hot-dip Double-coating

作　　者：陆宇衡[1] 肖罡[2] 黄彩敏[1] 上官琪[1] 曾建民[1] 

机构地区：[1]广西大学有色金属材料及其加工新技术重点实验室,南宁530004 [2]九江职业技术学院机械工程系,九江332007

出　　处：《腐蚀与防护》2010年第11期889-892,共4页Corrosion & Protection

基　　金：新型抗腐蚀铝合金及热浸镀技术(桂科基0832001);广西研究生教育创新计划资助项目(105930903001)

摘　　要：通过双镀法对Q235钢材进行热浸镀纯铝及Zn-55%Al-1.6%Si,通过对比试验,得到最佳的工艺参数。利用金相显微镜(OM)、扫描电子显微镜(SEM)观察镀层及缺陷的相组成,并利用能谱仪(EDS)对缺陷进行成分分析,研究了镀层缺陷出现的原因。试验结果表明,最佳双镀工艺为预镀锌层完全冷却后再二次浸镀,纯铝浸镀时间60 s,温度710℃,Zn-55%Al-1.6%Si浸镀时间30 s,温度640℃。此工艺能够有效改善热浸镀双镀法的镀层质量。双镀过程中瘤子是最严重的镀层缺陷,抑制镀层缺陷的方法是控制浸镀时间。The optimal double-plating process of hot-dip aluminum and Zn-55% Al-1.6% Si on Q235 steel was obtained.Metallurgic microscopy and scanning electron microscopy（SEM） were used to characterize the microstructure of coating defects,and energy dispersive X-ray spectroscopy（EDS） was employed to analyze the composition and forming reason of defects.The optimal process of hot-dip double-plating was determined as follow： carring out secondary dip after complete cooling of pre-plated Zn,dip time and temperature of pure Al and Zn-55% Al-1.6% Si were 60 s,710 ℃,and 30 s,640 ℃ respectively.Nubble was the main defect during double-plating.The restrain method was to control dip time.

关 键 词：热浸镀 双镀法 工艺优化 缺陷 

分 类 号：TG174.44[金属学及工艺—金属表面处理]