摘要
为了研究晶粒细化对镁合金阳极氧化膜的质量和性能的影响,采用阳极氧化的方法在常规变形镁合金和挤压-剪切大塑形变形后获得的细晶粒镁合金表面制备氧化膜,研究了常规变形镁合金和细晶粒镁合金表面阳极氧化膜的形貌、结构、成分、表面粗糙度、硬度及耐腐蚀性能。结果表明:与常规挤压镁合金相比,挤压-剪切后镁合金的晶粒得到了大大细化,其表面氧化膜的孔隙更为细小圆整,表面粗糙度更小,硬度更高,耐蚀性更好。分析认为:镁合金基体组织细化之后,缺陷密度增加,使其阳极氧化时表面火花非常细小,放电更均匀,从而使氧化膜更为致密,耐蚀性更好。
In order to study the effect of grain refinement on the quality and performance of magnesium alloy, anodic oxide films were formed on conventional AZ31 magnesium alloy and ultrafine-grained AZ31 magnesium alloy by extrusion-shearing. The morphology, structure,composition,surface roughness, hardness and corrosion resistance of anodic oxidation films on conventional and ultrafine-grained AZ31 magnesium alloy were studied. The results show thatcompared with the conventional magnesium alloy,the anodic oxidized surface of extrusion-shear magnesium alloy exhibits a more smaller and more rounded microspores,less surface roughness,higher hardness and better corrosion resistance. It is believed that the changes of the surface properties owe to the matrix microstructure refinement and the defect density increased. The spark discharge is more uniform and small on this surface,so that the film is more compact,and exhibits better corrosion resistance.
出处
《重庆理工大学学报（自然科学）》
CAS
2017年第12期58-62,104,共6页
Journal of Chongqing University of Technology：Natural Science
基金
重庆市基础与前沿研究计划项目(cstc2016jcyj A0434)
重庆市教委科学技术研究项目(KJ1601104)
关键词
挤压-剪切
细晶粒镁合金
阳极氧化
耐蚀性
extrusion-shearing process（ES）
ultra-fine grained magnesium alloy
anodic oxidation
corrosion resistance
