海水管路黄铜焊接接头在人工海水中的电化学阻抗谱
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF WELDED JOINTS OF COPPER PIPE IN ARTIFICIAL SEAWATER
摘 要
利用扫描电镜(SEM)、阳极极化与电化学阻抗谱(EIS)试验方法,研究了紫铜管路中的黄铜焊缝在人工海水中的腐蚀特性.结果表明,在Tafel区,黄铜焊缝以CuCl-2络合离子和Zn2+溶解,并且CuCl-2和Zn2+的扩散是该溶解过程的控制步骤；当电极电位极化到-0.01～＋0.31 V时,难溶物Cu2O、CuCl、ZnO和Zn(OH)2ZnCl2附着在电极表面阻碍电极极化,因而在EIS谱图上出现2个容抗弧；电极电位超过＋0.31 V后,难溶物开始溶解至＋0.57 V完全溶解,这时电极反应以脱锌腐蚀为主,电极过程为Zn2+离子向溶液扩散控制.
焊接
腐蚀
铜合金
Seawater pipe
Welded joint
Corrosion
Copper alloy
Abstract
The corrosion behavior of welded joints of copper pipe in artificial seawater was studied by anodic polarization,electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM).The brass welded joint was dissolved into Zn2+ and CuCl-2,and this process was controlled by the diffusion of Zn2+ and CuCl-2,in the Tafel region.In the anodic region between -0.01 V and +0.31 V(SCE),the anode was covered with Cu2O,CuCl,ZnO and Zn(OH)2ZnCl2 films which hindered electrochemical polarization.Two arcs of capacitive reactance appeared in the EIS.In the region between +0.31 V and +0.57 V(SCE),the dezincification reaction was dominant process which was controlled by the diffusion of Zn2+.
中图分类号 TG172
所属栏目 试验研究
基金项目
收稿日期 2006/9/27
修改稿日期 2006/10/31
网络出版日期
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引用该论文: ZHOU Jian-qi,WANG Hong-zhi,MA Qing-hua,YIN Jian-ping. ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF WELDED JOINTS OF COPPER PIPE IN ARTIFICIAL SEAWATER[J]. Corrosion & Protection, 2007, 28(8): 403～406
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参考文献
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【2】Alkharafi F M,Ateya B G.Selective dissolution of brass in salt water[J].J Applied Electrochemistry,2004,24:47-53.
【3】Proyer M J,Fister J C.The mechanism of dealloying of copper solid solutions and intermetallic phases[J].J Electrochem Soc,1984,131(6):1230-1235.
【4】曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2004:188-190.
【5】张吉刚,王振尧,等.铜合金及其复合材料在氯化钠盐雾中的腐蚀行为[J].中国有色金属学报,2004,14(5):836-841.
【6】lgual Munoz A,Garcia Anton J.Corrosion behavior and galvanic studies of brass and bronzes in aqueous lithum bromide solutions[J].Corrosion,2002,58(7):560-569.
【7】Rabab M El-Sherif,Khaled M Ismail,Waheed A Badawy.Effect of Zn and Pb as alloying elements on the electrochemical behavior of brass in NaCl solutions[J].Electrocheimical Atac,2004,49:5139-5150.
【8】于辉,董飒英,徐海波,等.不同阳极电位下铝青铜的电化学阻抗谱研究[J].电化学,2004,10(1):35-40.
【9】Al-Kharafi F M,Ateya B G,Allah R M.Selective dissolution of brass in salt water[J].Journal of Applied Electrochemistry,2004,1(34):47-53.
【10】Rabab M.El-Sherif,Khaled M.Ismail.Effect of Zn and Pb as alloying elements on the electrochemical behavior of brass in NaCl solutions[J].Electrochimica Acta,2004,49:5139-5150.
【11】王宏智,陈 君,周建奇,等.紫铜海水管焊接部位在海水中的腐蚀特征[J].中国有色金属学报,2006,16(4):645-650.
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