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
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。
微量银
电化学腐蚀行为
微观形貌
Sn-Zn alloy
minor Ag
electrochemical corrosion behavior
micro-morphology
Abstract
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.
中图分类号 TG454
所属栏目 材料性能及其应用
基金项目 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)
收稿日期 2013/12/27
修改稿日期 2014/12/19
网络出版日期
作者单位点击查看
备注赵柏森(1975-),男,重庆人,副教授,硕士。
引用该论文: ZHAO Bai-sen,FU Tian,MA Rui,ZHAO Guo-ji. Influence of Minor Ag on Electrochemical Corrosion Behavior of Sn-9Zn Alloy[J]. Materials for mechancial engineering, 2015, 39(4): 68～70
赵柏森,傅田,马睿,赵国际. 微量银对Sn-9Zn合金电化学腐蚀行为的影响[J]. 机械工程材料, 2015, 39(4): 68～70
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