摘要
为提高纯镁的耐腐蚀性能,在大气环境下,采用固态扩散锌钇共渗的方法,对纯镁进行表面改性处理,研究了不同扩散时间对合金化渗层的影响。采用OM、SEM、EDS、XRD、显微硬度测试和电化学腐蚀测试等方法对渗层的组织结构、显微硬度和耐蚀性能进行了分析。结果表明,在一定范围内随着扩散时间的延长,渗层厚度迅速增加,但当渗层具有一定厚度后再延长时间,渗层厚度的增幅急剧减小。本实验中最佳扩散时间为90 min。该渗层组织由Mg7Zn3、MgZn、α-Mg固溶体组成。表层的显微硬度得到了大幅度提高,有效改善了纯镁在3.5%NaCl溶液中的耐腐蚀性能。
Surface modification treatment on pure magnesium was conducted by solid zinc-yttrium co-diffusing under atmosphere conditions to improve the corrosion resistance of pure magnesium.The effect of diffusion time on the zinc-yttrium co-diffusing layer was investigated.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 test.The results show that the thickness of the zinc-yttrium co-diffusing layer increases rapidly with the prolonging diffusion time within a certain range.However,the increase degree of the layer thickness decreases sharply with the prolonging diffusion time after a certain thickness is attained.The optimum diffusion time is 90 min.The layer is composed of Mg7Zn3,MgZn and α-Mg solid solution.The microhardness of the zinc-yttrium co-diffusing layer increases significantly.Corrosion resistance of pure magnesium with the layer in 3.5% NaCl solution can be improved obviously.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第4期178-182,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51301118
51274149)
2013山西省高等学校科技创新项目(2013108)
关键词
纯镁
锌钇共渗层
显微硬度
耐蚀性
pure magnesium
zinc-yttrium co-diffusing layer
microhardness
corrosion resistance
