ZCuSn5Pb5Zn5/B10偶对在流动海水中的腐蚀规律与机制研究  

Galvanic Corrosion Behavior of ZCuSn5Pb5Zn5/B10 Couple in Flowing Seawater

作　　者：邢少华 刘仲晔 刘近增 白舒宇 钱峣 张大磊 XING Shaohua;LIU Zhongye;LIU Jinzeng;BAI Shuyu;QIAN Yao;ZHANG Dalei(State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China;Military Representative Office of Naval Equipment Department in Xiangtan Region,Xiangtan 411100,China;Offshore Oil Engineering(Qingdao)Co.,Ltd.,Qingdao 266520,China;Qingdao Jimo District Bureau of Industry and Information Technology,Qingdao 266205,China;School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国船舶集团公司第七二五研究所、海洋腐蚀与防护重点实验室,青岛266237 [2]海军装备部驻湘潭地区军事代表室,湘潭411100 [3]海洋石油工程(青岛)有限公司,青岛266520 [4]青岛市即墨区工业和信息化局,青岛266205 [5]中国石油大学(华东)材料科学与工程学院,青岛266580

出　　处：《中国腐蚀与防护学报》2023年第6期1339-1348,共10页Journal of Chinese Society For Corrosion and Protection

摘　　要：通过电化学法和微观形貌表征手段研究了ZCuSn5Pb5Zn5和B10管状偶对在静态以及1、3和5 m/s流速海水中的电偶腐蚀规律,探讨了电偶腐蚀机理。结果表明:在静态海水中,ZCuSn5Pb5Zn5和B10几乎不发生电偶腐蚀,且多次发生极性反转现象;流动海水中,ZCuSn5Pb5Zn5和B10间电偶腐蚀速率显著增加,1、3和5m/s流速海水中的电偶腐蚀分别是静态海水中的22倍、49倍和69倍。混合电位理论分析表明ZCuSn5Pb5Zn5/B10电偶腐蚀速率是由ZCuSn5Pb5Zn5阳极反应动力学和B10阴极反应动力学共同控制,流动海水加速溶解氧、腐蚀产物扩散,金属阳极溶解和溶解氧还原速率增加,电偶腐蚀速率增加;在低流速条件下,阳极表面沉积腐蚀产物可抑制电偶腐蚀,但流速达到3 m/s以上时,腐蚀产物难以形成,保护作用逐渐减弱。Valve is one of the most important components for seawater pipeline,and is widely used in ship,but it suffers from serious corrosion,which leads to leaking or unclosing.Galvanic corrosion be-tween ZCuSn5Pb5Zn5 and B10 is the main cause of such corrosion.In this paper,the galvanic corrosion of the couple ZCuSn5Pb5Zn5/B10 in flowing seawater and the galvanic corrosion mechanism is as-sessed by means of electrochemical method,SEM and EDS.The results suggest that,in static seawater,the galvanic corrosion rate between ZCuSn5Pb5Zn5 and B10 is very small,the relevant anode and cath-ode are reversed many times.In flowing seawater of 1,3 and 5 m/s,the galvanic corrosion rate of ZCuSn5Pb5Zn5 obviously increases,which is 22,49 and 69 times of that in static seawater respectively.In flowing seawater,the diffusion rate of dissolved oxygen and corrosion products is accelerated and the rele-vant anodic-and cathodic-reactions are both accelerated,thus the galvanic corrosion rate increases.The galvanic corrosion between ZCuSn5Pb5Zn5 and B10 is controlled by both the ZCuSn5Pb5Zn5 anodic re-action and the B10 cathodic reaction.With the gradually depositions of corrosion products,the anodic-and cathodic-reactions are inhibited,however when the flowing rate is more than 3 m/s,the deposition of corrosion products turns to be difficult,thus cannot provide proper barrier effect to the galvanic corrosion.

关 键 词：海水管路 截止阀 铜镍合金 流动海水 电偶腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]