Galvanic corrosion behavior of copper/titanium galvanic couple in artificial seawater  

Cu/Ti在模拟海水中的电偶腐蚀行为(英文)

作　　者：杜小青[1] 杨青松 陈宇[1] 杨洋[1] 张昭[1] 

机构地区：[1]浙江大学化学系,杭州310027 [2]湛江腐蚀与防护研究中心,湛江524000

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第2期570-581,共12页中国有色金属学报（英文版）

基　　金：Projects(21073162,51131005)supported by the National Natural Science Foundation of China;Project(Y4100206)supported by the Science and Technology Bureau of Jiaxing Municipality and Zhejiang Provincial Natural Science Foundation of China

摘　　要：The corrosion behaviors of copper and copper/titanium galvanic couple （GC） in seawater were studied by electrochemical impedance spectroscopy （EIS） and electrochemical noise （EN） techniques in conjunction with scanning electron microscopy （SEM） method. The results show that the corrosion process of copper in seawater can be divided into two stages, in which corrosion resistance and SE show the same evolution trend of initial increase and subsequent decrease, while SG changes oppositely. However, the ensemble corrosion process of copper/titanium GC in seawater includes three stages, in which corrosion resistance and SE show the evolution features of initial decrease with a subsequently increase, and the final decrease again;while SG changes oppositely. The potential difference between copper and titanium in their galvanic couple can accelerate the initiation of pitting corrosion of copper, and both the minimum and maximum corrosion potentials of copper/titanium GC are much more positive than those of pure copper.采用电化学阻抗谱、电化学噪声和扫描电镜等技术研究了纯铜、铜/钛耦合电极在模拟海水中的腐蚀行为。结果表明:纯铜的腐蚀过程分2个阶段,其腐蚀阻抗和点蚀参数SE均遵循先增后降的规律,而其腐蚀参数SG的变化规律则正好相反;铜/钛耦合电极的腐蚀过程则由3个阶段组成,其腐蚀阻抗和点蚀参数SE均遵循先降后升到最后再降的规律,而其腐蚀参数SG则同样反向变化。铜和钛之间的电势差加速了纯铜的点蚀萌生,同时铜/钛耦合电极的腐蚀电位总是正于纯铜的腐蚀电位。

关 键 词：Cu/Ti galvanic couple galvanic corrosion electrochemical impedance spectroscopy electrochemical noise 

分 类 号：TG174.3[金属学及工艺—金属表面处理]