海水中Cu^(2+)对B10铜合金腐蚀行为的影响  

The Effect of Cu^(2+) on Corrosion Behavior of B10(90Cu10Ni) Alloy in Seawater

作　　者：赵增元[1] 吕伟艳[2] ZHAO Zeng-yuan;LV Wei-yan(Offshore Oil Engineering (QingDao) Co., Ltd. Qingdao 266520, China;Agriculture University of Qingdao, Qingdao 266109, China)

机构地区：[1]海洋石油工程(青岛)有限公司,山东青岛266520 [2]青岛农业大学,山东青岛266109

出　　处：《全面腐蚀控制》2017年第7期63-67,共5页Total Corrosion Control

摘　　要：使用腐蚀电位、线性极化电阻和电化学阻抗谱等电化学方法研究了海水环境中Cu^(2+)对Bl0铜合金腐蚀行为的影响。研究结果表明,海水中一定浓度的Cu^(2+)能够增大B10铜合金腐蚀速度。加入的Cu^(2+)能够在一定条件下还原沉积在基体金属、腐蚀产物膜表面。沉积的铜和基体金属形成电偶电池,铜膜为阴极,基体金属为阳极,增大基体金属腐蚀速度。所以当海洋结构中具有B10铜镍合金结构时,必须控制海水中电解铜离子浓度,在控制生物附着与污损的同时避免诱发铜合金电偶腐蚀破坏。Open circuit potential,liner polarization and electrochemical impedance spectroscopy techniques have been used in this paper to study the effect of Cu2+ions on B10alloy.The results of the experiments indicated that the Cu2+ions reduced the corrosion-resistance capability of the alloy.The Cu2+ions as cathode were reduced by the film rich in Ni and the alloy to Cu,which deposited on the surface of the film and the alloy.The reduced Cu was coupled with the film and the alloy further,which can make the film more porous and lose its capability of protection.Seawater could easily go through the pores and reach the interface of film/alloy.The Cu deposited unevenly,which would induce localized corrosion even pitting corrosion.These two kinds of corrosion were more harmful to the alloy.So we conclude that it is not proper to use the method of adding Cu2+ions into the seawater directly to refrain the attachment of marine organisms and the marine fouling when there are structures made from B10alloy.Other ways must be looked for.

关 键 词：B10铜镍合金 CU2+ 电化学方法 

分 类 号：TG[金属学及工艺]