微量银对Sn-9Zn合金电化学腐蚀行为的影响  

Influence of Minor Ag on Electrochemical Corrosion Behavior of Sn-9Zn Alloy

作　　者：赵柏森[1] 傅田[1] 马睿[1] 赵国际[1] 

机构地区：[1]重庆工业职业技术学院机械工程学院,重庆401120

出　　处：《机械工程材料》2015年第4期68-70,80,共4页Materials For Mechanical Engineering

基　　金：重庆市教委科研项目(KJ132105);重庆工业职业技术学院科研项目(GZY201210-YK)

摘　　要：采用电化学测试、扫描电镜观察、能谱分析等方法,研究了添加质量分数为0.5%的银元素对Sn-9Zn合金在3.5%NaCl溶液中电化学腐蚀行为的影响。结果表明:Sn-9Zn合金中均匀的显微组织使腐蚀原电池反应较为均匀,表面锌相作为腐蚀原电池的阳极几乎完全发生了腐蚀溶解;在添加0.5%银的Sn-9Zn合金中,局部形成银锌金属间化合物(IMC),合金成分与组织的不均匀导致腐蚀原电池反应不均衡,合金的自腐蚀电位略有提高,且会发生以锡相为阳极、富银相为阴极的腐蚀原电池反应。Electrochemical testing,scanning electron microscopy（SEM）observation,energy spectrum analysis were used to study the influence of minor Ag addition on the electrochemical corrosion behavior of Sn-9Zn alloy in 3.5wt.% NaCl solution.The results indicate that the galvanic corrosion reaction in the Sn-9Zn alloy was uniform due to its uniform microstructure.As the anode of the galvanic corrosion reaction,Zn phase almost completely dissolved and reacted in the Sn-9Zn alloy surface.Ag-Zn intermetallic compounds（IMCs）appeared in the Sn-9Zn alloy added with 0.5wt% Ag.An uneven composition and microstructure of the Sn-9Zn-0.5Ag alloy resulted in the galvanic corrosion reaction lopsided and uneven.The corrosion potential shift slightly,and another galvanic corrosion reaction using Sn-rich phase as anode and Ag-rich phase as cathode occurred.

关 键 词：锡锌合金 微量银 电化学腐蚀行为 微观形貌 

分 类 号：TG454[金属学及工艺—焊接]