AZ91镁合金表面等离子熔凝处理及耐蚀性研究  

Study on the Surface Melting Treatment and the Corrosion Resistance of Magnesium Alloy AZ91 by Plasma Surface Treatment

作　　者：崔洪芝[1] 张海波[1] 孙金全[1,2] 曹丽丽[1] 肖成柱[1] 

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266510 [2]中国石油大学(华东)机电工程学院,山东青岛266555

出　　处：《材料工程》2009年第S1期232-235,240,共5页Journal of Materials Engineering

基　　金：973子项-镁合金等离子快速凝固和表面改性研究(2007CB613706);863计划项目(2006AA06Z381)

摘　　要：通过AZ91镁合金表面等离子处理,获得了镁合金表面熔凝层组织,采用SEM,EDS,极化曲线等测试方法,对处理后的AZ91镁合金微观结构和耐腐蚀性进行了研究,讨论了不同电流对AZ91镁合金硬度及熔凝层深度的影响。结果表明:经等离子扫描处理后的镁合金晶粒明显细化,硬度值显著提高,自腐蚀电位增大,自腐蚀电流密度减小,耐腐蚀性得到提高。The magnesium alloy surface melting structure was obtained by plasma surface treatment to AZ91 magnesium alloy.The microstructure and corrosion resistance of AZ91 magnesium alloy were analysed by using SEM,EDS and polarization curve.The hardness and penetration were discussed at different current.It shows that the grain of the melted layer is highly refined and the hardness of the melted layer is highly improved after plasma surface treatment.The maximum hardness of AZ91 is up to150HV at presence of 50A,which outclass the hardness of substrate(about 80HV).It can be obtained that the corrosion potential increases and the corrosion current density decreases based on the polarization curve.

关 键 词：AZ91镁合金 等离子处理 硬度 极化曲线 

分 类 号：TG174.4[金属学及工艺—金属表面处理]