纯镁表面真空扩散锌钇共渗层的组织及性能  

Microstructure and property of zinc-yttrium coating on pure magnesium by vacuum solid diffusion

作　　者：王红霞[1,2] 郭玉玲[1,2,3] 梁伟[1,2] 阴耀鹏[1,2] 赵兴国[1,2] 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]太原理工大学新材料界面科学与工程教育部重点实验室,太原030024 [3]晋中职业技术学院机电工程系,榆次030600

出　　处：《中国有色金属学报》2009年第3期439-444,共6页The Chinese Journal of Nonferrous Metals

基　　金：山西省大学生创新创业专项基金资助项目(07010727);山西省青年科技研究基金资助项目(2008021033);山西省归国留学基金资助项目(2007-25)

摘　　要：采用真空扩散锌钇共渗方法,在400℃下对纯镁进行表面合金化改性处理。采用OM、SEM、EDS、XRD和显微硬度、电化学腐蚀极化曲线测试等方法对渗层的组织结构、显微硬度和腐蚀性能进行分析。结果表明:表面合金化处理后,纯镁表面获得了致密的厚约2.7mm的合金反应渗层,渗层由金属间化合物Mg7Zn3、α-Mg饱和固溶体、α-Mg和I-Phase(Mg40Zn55Y5或Mg30Zn60Y10)片层共晶组织构成;该锌钇共渗层的显微硬度有很大的提高,并明显改善了纯镁在5%NaCl溶液中的耐腐蚀性能。Surface modification treatment on pure magnesium was conducted at 400℃ by vacuum solid zinc-yttrium co-diffusing. The microstructure, microhardness and corrosion resistance of the zinc-yttrium co-diffusing layer were investigated by OM, SEM, EDS, XRD, microhardness test and electrochemical corrosion polarization curves test. The results show that the zinc-yttrium co-diffusing layer with an thickness of 2.7 mm forms on the surface of pure magnesium after surface modification treatment. The dense layer is composed of intermetallic compounds Mg7Zn3, α-Mg saturate solution, α-Mg and I-phase （Mg40Zn55Y5 or Mg30Zn60Y10） lamellar eutectic phases. The microhardness of the surface diffusion alloying layer increases significantly and its corrosion resistance in 5% NaCt solution also improves obviously.

关 键 词：纯镁 锌钇共渗层 显微硬度 耐蚀性 

分 类 号：TG146.22[一般工业技术—材料科学与工程]