稀土Y的添加对粉末包埋渗锌涂层耐腐蚀性能的影响  

Effect of Y Addition on Corrosion Resistance of Pack Cementation Zinc Coating on 42CrMo Steel

作　　者：刘丽 于思荣[1] LIU Li, YU Sirong(College of Mechanical and Electronic Engineering, China University of Petroleum （East China）, Qingdao 266580, China)

机构地区：[1]中国石油大学(华东)机电工程学院,青岛266580

出　　处：《腐蚀科学与防护技术》2018年第5期475-480,共6页Corrosion Science and Protection Technology

基　　金：中央高校基本科研业务费专项资金(16CX06020A)~~

摘　　要：采用粉末包埋技术在410℃下扩散渗3 h,在42CrMo钢表面制备了Zn-Fe渗层和Zn-Fe-Y渗层,观察了渗层的显微结构,分析了渗层的相组成,测量了渗层在3.5%(质量分数) NaCl溶液中的耐腐蚀性能,并研究了稀土Y的添加对Zn-Fe渗层的显微结构和耐腐蚀性能的影响。金相观察表明,Zn-Fe渗层和Zn-Fe-Y渗层都连续且呈单层结构,Y的添加改善了渗层的微观结构,增加了渗层的厚度。Zn-Fe渗层主要由FeZn_9、FeZn_(11)和Fe_(11)Zn_(40)相组成。除FeZn相外,Zn-Fe-Y渗层中还含有YZn_5相。渗层的元素浓度分布图表明,Y的添加促进了Zn和Fe的扩散。浸泡实验和极化实验结果表明,Zn-Fe-Y渗层的耐腐蚀性能优于Zn-Fe涂层的。To improve the corrosion resistance of 42 CrMo steel, coatings of Zn-Fe and Zn-Fe-Y were prepared by pack cementation process at 410 ℃ for 3 h. The prepared coatings were then characterized in terms of microstructure, thicknesse, phase composition, chemical composition as well as corrosion rate and polarization behavior in 3.5%NaCl solution. Results show that the Zn-Fe coating and Zn-FeY coating were continuous and monolayered. The Zn-Fe-Y coating was thicker than the Zn-Fe coating.The Zn-Fe coating was composed of FeZn9, FeZn（11） and Fe（11）Zn（40） phases, besides YZn5 could be detected in the coating with the addition of Y. The element concentration profiles showed that the addition of Y promoted the diffusion of Zn and Fe atoms. The corrosion rate of the Zn-Fe-Y coating was smaller than that of the Zn-Fe coating. The corrosion current density of the two coatings was lower than that of the substrate, while the corrosion current density of the Zn-Fe-Y coating was lower than that of the Zn-Fe coating. The corrosion resistance of the Zn-Fe-Y coating was better than that of the Zn-Fe coating.

关 键 词：粉末包埋 ZN-FE Y 显微结构 耐腐蚀性能 

分 类 号：TG172.3[金属学及工艺—金属表面处理]