激光表面合金化处理对AZ91D组织与耐蚀性能的影响  

Effects of Laser Surface Alloying on the Microstructure and Corrosion Resistance of AZ91D

作　　者：石雪梅 刘帅[2] 樊巧芳 杨铁军 郭凤平 丛丹 杨益民 SHI Xue-mei;LIU Shuai;FAN Qiao-fang;YANG Tie-jun;GUO Feng-ping;CONG Dan;YANG Yi-min(Electromechanical Engineering Training Department,Liaohe Oilfield Training Center,Panjin 124010,China;Xinglongtai Plant,Liaohe Oilfield Company,Panjin 124010,China;Jiangsu College of Safety Technology,Xuzhou 221011,China)

机构地区：[1]辽河油田培训中心机电工程培训部,辽宁盘锦124010 [2]辽河油田兴隆台采油厂,辽宁盘锦124010 [3]江苏安全技术职业学院,江苏徐州221011

出　　处：《材料保护》2022年第6期28-33,共6页Materials Protection

摘　　要：镁合金的耐蚀性较差,因此进行适当的表面改性处理以提高其耐蚀性成为目前研究的热点。在AZ91D镁合金表面预置Al粉并进行激光合金化处理,对比分析了合金化层组织和基体组织,测试了镁合金基体及合金化层的耐蚀性。结果表明:激光合金化区灰白色基体是由小部分α-Mg和较多的β-Mg_(17)Al_(12)组成,暗黑色点状组织是α-Mg+β-Mg_(17)Al_(12)针叶状组织是α-Mg。激光合金化工艺使合金化区中α-Mg晶粒细化,铝元素的偏析程度降低,β-Mg_(17)Al_(12)的含量显著增多,从而使镁合金表面的耐蚀性大幅度提升。Owing to the poor corrosion resistance of magnesium alloys,applying proper surface modification treatment to improve their corrosion resistance has become a hot point of current research.In this work,Al powders were pre-placed on the surface of AZ91D magnesium alloy and further treated by laser alloying.The microstructures of the alloyed layer and the substrate were compared and analyzed,and the corrosion resistances of the magnesium alloy and the alloyed layer were tested.Results showed that the gray-white matrix in the laser alloyed area was composed of a small part ofα-Mg and a large amount ofβ-Mg_(17)Al_(12),the dark black dotted structure wasα-Mg+β-Mg_(17)Al_(12),and the coniferous structure wasα-Mg.In all,the laser alloying process refined theα-Mg grains in the alloyed area,reduced the segregation degree of aluminum element,and significantly increased the content ofβ-Mg_(17)Al_(12),and therefore greatly improved the corrosion resistance of the magnesium alloy surface.

关 键 词：镁合金 激光合金化 组织 腐蚀 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]