某型便携式装备镁合金基材腐蚀失效分析  

Corrosion Failure Analysis of Magnesium Alloy Substrate for a Portable Equipment

作　　者：蔡林宏 陈元林 刘世梁 杨炯昕 CAI Linhong;CHEN Yuanlin;LIU Shiliang;YANG Jiongxin(China South Industries Group Automation Research Institute Limited,Mianyang 621000,China)

机构地区：[1]中国兵器装备集团自动化研究所有限公司,四川绵阳621000

出　　处：《材料开发与应用》2024年第5期39-43,共5页Development and Application of Materials

基　　金：中国兵器装备集团有限公司关键技术攻关项目(2022165)。

摘　　要：由AZ31B镁合金制造的装备易在湿热试验后出现局部腐蚀现象,这会极大影响装备的使用寿命。本研究以AZ31B镁合金制备的某型便携式样机为研究对象,采用Leica超景深显微镜宏观分析腐蚀表面,用扫描电镜(SEM)进行表面形貌分析,并从镁合金零件机械设计及加工、化学镀镍、涂装工艺等方面进行探究,指出失效原因及机理。结果表明,本装备镁合金基材的局部腐蚀主要由零件应力集中、中磷化学镀镍及涂装工艺缺陷共同作用导致,主要为电化学腐蚀。最后,提出该型装备的腐蚀防护改进措施,提高了装备的环境适应性及可靠性。Local corrosion is inclined to occur to equipment made from AZ31B magnesium alloy after the humid heat test,which is a disadvantage to the service life of the equipment.In this study,with a portable equipment made from AZ31B magnesium alloy as the object,its macro-and micro-morphologies of corrosion are analyzed by Leica ultra-depth of field microscope and SEM,and the causes and mechanisms for the failure are investigated from perspectives of mechanical design and processing,electroless nickel plating,and coating process.It is concluded that the stress concentration and electroless nickel plating with medium volume of phosphorus and defects in coating process result in the corrosion,and that the corrosion is electrochemical corrosion.Based on the process verification and analysis,the improvement measures of corrosion protection for this type of equipment are put forward to promote the environment serviceability and reliability of the equipment.

关 键 词：镁合金 湿热试验 化学镀镍 腐蚀失效 

分 类 号：TG178[金属学及工艺—金属表面处理]