HVOF喷涂Co基WC涂层的耐锌腐蚀行为  

Zinc corrosion resistant behavior of HVAF sprayed Co based WC coating

作　　者：李德元[1] 谢天男[1] 尹雁冬 黄娣[3] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]大连华锐重工特种备件制造有限公司技术部,辽宁大连116052 [3]辽宁地质工程职业学院机电系,辽宁丹东118008

出　　处：《沈阳工业大学学报》2013年第4期385-389,共5页Journal of Shenyang University of Technology

基　　金：沈阳市科技局科技攻关项目(F10-011-2-00)

摘　　要：为了提高热镀锌用辊件的耐腐蚀性,试验采用超音速火焰喷涂方法制备WC-12Co涂层,研究了涂层在450℃锌液中的耐腐蚀性能以及失效机制.将316L/WC-12Co涂层进行液锌腐蚀,以扫描电镜能谱分析、x-射线衍射方式分析对比了未经过腐蚀试件、腐蚀5天试件、腐蚀10天试件的组织变化和相组成,结果显示涂层基体Co受液锌腐蚀生成Co与Zn化合物,引发横向裂纹,导致涂层剥落.涂层全部剥落后保护失效,使母材被液锌直接严重腐蚀,最终生成锌渣FeZn13.In order to improve the zinc corrosion resistance of rollers used for hot-galvanization, WC-12Co coating was prepared with high velocity oxygen fuel （HVOF） spraying method, and the corrosion resistance and failure mechanism of the coating in liquid zinc at 450 ℃ were studied. The liquid zinc corrosion tests were performed for the 316/WC-12Co coating. The microstructural change and phase constituent of specimens without corrosion as well as specimens corroded respectively for five and ten days were analyzed with SEM-EDS and XRD. The results show that the Co-Zn compounds generate on the Co matrix of the coating after the liquid zinc corrosion, which causes the transversal cracks and leads to the flaking of the coating. When the coating entirely flakes off, the protection effect of the coating will disappear, and thus, the base metal is seriously corroded by liquid zinc and some zinc slag （Fe-Zn13） forms finally.

关 键 词：辊件 碳化钨 超音速火焰喷涂 涂层 液锌腐蚀 热镀锌 横向裂纹 失效机制 

分 类 号：TG174.422[金属学及工艺—金属表面处理]