新型铝阳极在滩海陆岸环境中的活化机理  

Activation Mechanism of New Al Anode in Tidal and Coastal Environment

作　　者：孙鑫宁 杨超[2] 刘海波[2] 王安泉 乍靖榆 王德华 SUN Xinning;YANG Chao;LIU Haibo;WANG Anquan;ZHA Jingyu;WANG Dehua(Engineering Technology Management Center of Shengli Oilfield,SINOPEC,Dongying 257000,China;Technology Inspection Center of Shengli Oilfield,SINOPEC,Dongying 257000,China;PipeChina West East Gas Pipeline Company,Zhengzhou 450003,China)

机构地区：[1]中国石化胜利油田分公司工程技术管理中心,东营257000 [2]中国石化胜利油田分公司技术检测中心,东营257000 [3]国家管网集团西气东输公司郑州输气分公司,郑州450003

出　　处：《腐蚀与防护》2023年第6期40-46,共7页Corrosion & Protection

摘　　要：针对国标铝阳极在滩海陆岸环境中不能满足阴极保护要求的问题,建立了用于模拟滩海陆岸环境的试验装置,研究了3种新型铝阳极在滩海陆岸环境中的工作特性和活化机理。结果表明:Al-1阳极和Al-3阳极的实际电容量均大于1500 A·h·kg^(-1),电流效率均大于50%,这优于国标铝阳极性能;在-1.10 V极化电位下,3种新型阳极的稳定阳极电流密度分别为128μA·cm^(-2)(Al-1阳极)和70μA·cm^(-2)(Al-2阳极和Al-3阳极)。Al-1阳极更适合滩海陆岸环境,原因是Al-1阳极中Sn-In固溶体和GaO_(3)^(3-)的还原过程促进了铝阳极表面腐蚀产物层在滩海陆岸环境中的持续溶解。Aiming at the problem that the national standard aluminum anode cannot meet the requirements of cathodic protection in the tidal and coastal environment,a test device for simulating tidal and coastal soil environment was established,and the working characteristics and activation mechanism of three new Al anodes in tidal and coastal environment were studied.The results showed that the actual capacitance of Al-1 anode and Al-3 anode was greater than 1500 A·h·kg^(-1),and the current efficiency was greater than 50%,which was better than the national standard aluminum anode performance.At-1.10 V polarization potential,the stable anode current densities of the three new anodes were 128μA·cm^(-2)(Al-1 anode)and 70μA·cm^(-2)(Al-2 anode and Al-3 anode),respectively.The Al-1 anode was more suitable for the beach and coastal environment,because the reduction process of Sn-In solid solution and GaO_(3)^(3-)in the Al-1 anode promoted the continuous dissolution of corrosion product layer on the surface of aluminum anode in tidal and coastal environment.

关 键 词：滩海陆岸环境 干湿交替 铝阳极 工作特性 活化机理 

分 类 号：TG174[金属学及工艺—金属表面处理]