Al-Zn-Sn-Ce牺牲阳极干湿交替环境电化学性能研究  

Electrochemical Performance of Al-Zn-Sn-Ce Sacrificial Anode in Alternating Dry and Wet Environment

作　　者：张一晗 杨美桐 张海兵[1] 马力[1] 李祯 段体岗[1] ZHANG Yi-han;YANG Mei-tong;ZHANG Hai-bing;MA Li;LI Zhen;DUAN Ti-gang(State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Shandong Qingdao 266237,China;School of Mechanical Engineering,Liaoning Petrochemical University,Liaoning Fushun 113001,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266237 [2]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《装备环境工程》2023年第6期75-82,共8页Equipment Environmental Engineering

摘　　要：目的为满足高强钢装备的阴极保护要求,开展新型干湿交替环境牺牲阳极电化学性能测试,评价材料的阴极保护效果。方法采用高温熔炼方法,制备Al-Zn-Sn-Ce低电位牺牲阳极试样,进行不同浸水率下(干湿态环境时间比为1:1、3:1和7:1)的干湿交替环境牺牲阳极电化学性能试验、电化学表征测试及腐蚀微观形貌表征,通过对比试验数据和材料形貌表征结果,综合分析铝合金牺牲阳极在干湿交替环境下的电化学性能,探究干湿交替环境因素对阳极溶解行为的影响。结果Al-Zn-Sn-Ce牺牲阳极在多种试验环境下的工作电位为‒0.70~‒0.81 V(vs.SCE),符合高强钢阴极保护电位需求,阳极表面溶解形貌相对均匀,表面阴阳极电化学微区分布均匀。随着干湿态试验环境时间比的增加,阳极工作电位出现正移,干态环境下表面腐蚀产物的沉积和结壳导致阳极活化溶解能力下降,而干湿态环境时间比最大时,阳极自腐蚀反应得到一定的抑制,阳极电流效率均保持在75%以上。结论随着干湿态试验环境时间比的增加,牺牲阳极在干湿交替试验环境中的工作电位出现正移。由于干态环境下表面腐蚀产物的沉积和结壳,导致阳极活化溶解能力下降,但自腐蚀反应得到抑制。Al-0.7Zn-0.1Sn-0.1Ce低电位牺牲阳极在复杂干湿交替环境中表现出良好的阴极保护性能。The work aims to carry out the electrochemical performance test of the new sacrificial anode in alternating dry and wet environment to evaluate the cathodic protection effect of the material,so as to meet the cathodic protection requirements of high-strength steel equipment.Al-Zn-Sn-Ce low-potential sacrificial anode samples were prepared by high-temperature smelting method and subject to electrochemical performance test,electrochemical characterization test and corrosion mi-cro-morphology characterization of sacrificial anode in alternating dry and wet environments at different water immersion rates(the time ratio of dry and wet conditions was 1:1,3:1,and 7:1).By comparing the test data and material morphology characteri-zation results,the electrochemical performance of aluminum alloy sacrificial anode in the alternating dry and wet environment was comprehensively analyzed,and the effect of alternating dry and wet environment factors on the anodic dissolution behavior was explored.The working potential of Al-Zn-Sn-Ce sacrificial anode in various test environments was‒0.70~‒0.81 V(vs.SCE),which met the requirements of high-strength steel cathodic protection potential.The dissolution morphology of anode surface was relatively uniform,and the electrochemical micro-regions of anode and cathode on the surface were evenly distrib-uted.With the increasing time ratio of dry and wet test environment,the working potential of the anode shifted positively and the deposition and crusting of the surface corrosion products in the dry environment led to a decrease in the anodic activation and dissolving ability.The corrosion reaction was suppressed to a certain extent,and the anode current efficiency was main-tained above 75%.With the increase of the time ratio of the dry and wet test environment,the working potential of the sacrificial anode in the alternating dry and wet test environment shifts positively.The self-corrosion reaction is inhibited,and the Al-0.7Zn-0.1Sn-0.1Ce low-potential sacrificial anode exhibits good ca

关 键 词：干湿交替环境 水下装备 牺牲阳极 电化学 

分 类 号：TG172[金属学及工艺—金属表面处理]