(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)
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2.7 mm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。
关键字: 纯镁；锌钇共渗层；显微硬度；耐蚀性
（1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education,
Taiyuan University of Technology, Taiyuan 030024, China;
3. Department of Machine and Electric Engineering, Jinzhong Vocational Technology Institute, Yuci 030600, China）
Abstract: 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% NaCl solution also improves obviously.
Key words: pure magnesium; zinc-yttrium co-diffusing layer; microhardness; corrosion resistance
