锌合金牺牲阳极海水干湿交替条件下的电化学性能研究
ELECTROCHEMICAL PERFORMANCE OF ZINC ALLOY SACRIFICIAL ANODE IN SEA WATER UNDER WET-DRY CYCLIC EXPOSURE CONDITION
摘 要
对Zn-Al-Cd合金牺牲阳极在海水全浸和海水干湿交替条件下的电化学性能进行了对比研究,并对阳极表面腐蚀产物的形貌和阳极表面溶解状况进行了分析.随着干湿交替次数的增加,锌合金阳极的工作电位逐渐正移,发出电流的能力逐渐减弱,阳极活性逐渐降低,电流效率明显下降.在干湿交替条件下,锌合金阳极表面腐蚀产物更为致密,表面溶解状况不如全浸时的均匀.表面腐蚀产物层致密和局部腐蚀是造成干湿交替条件下锌合金牺牲阳极活性和电流效率降低的主要原因.
牺牲阳极
干湿交替
电化学性能
Zinc alloy
Sacrificial anode
Dry-wet alternation
Electrochemical performance
Abstract
The electrochemical performance of a Zn-Al-Cd alloy sacrificial anode was studied in seawater upon wet-dry cyclic exposure.The morphology of the corrosion products and the dissolution behavior of the anode surface were examined.With the increase of wet-dry cycles,the working potential of the zinc alloy anode moved gradually in the positive direction,while the electrochemical activity of the anode reduced and its current efficiency decreased significantly.The corrosion product of the anode after cyclic exposure was denser than that after full immersion in seawater and the dissolution of the anode suface for the former was not as uniform as for the latter.The decrease of anode activity and current efficiency could be mainly attributed to the formation of dense corrosion product and localized corrosion at the anode surface.
中图分类号 TG172.4
所属栏目 试验研究
基金项目
收稿日期 2006/3/6
修改稿日期 2006/5/12
网络出版日期
作者单位点击查看
引用该论文: MA Yan-yan,XU Li-kun,WANG Hong-ren,WANG Jia. ELECTROCHEMICAL PERFORMANCE OF ZINC ALLOY SACRIFICIAL ANODE IN SEA WATER UNDER WET-DRY CYCLIC EXPOSURE CONDITION[J]. Corrosion & Protection, 2007, 28(1): 9～12
被引情况:
【1】沈磊,宋振纶, "超塑性锌铝合金的腐蚀行为",腐蚀与防护 32, 761-764(2011)
【2】黄振风,郭建章,刘广义,杜建平,马力,陈志杰, "海水干湿交替环境对铝合金牺牲阳极性能的影响",腐蚀与防护 37, 160-164(2016)
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参考文献
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【2】Cruz R P,Nishikata A,Tsuru T.Pitting corrosion mechanism of stainless steels under wet-dry exposure in chloride-containing environments[J].Corros Sci,1998,40:125-139.
【3】El-Mahdy G A,Tsuru T,Nishikata A.Electrochemical corrosion monitoring of galvanized steel under cyclic wet-dry conditions[J].Corros Sci,2000,42:183-194.
【4】Kamimura T,Stratmann M.The influence of chromium on the atmospheric corrosion of steel[J].Corros Sci,2001,43:429-447.
【5】Yadav A P,Suzuki F,Nishikata A,et al.Investigation of atmospheric corrosion of Zn using ac impedance and differential pressure meter[J].Electrochim Acta,2004,49:2725-2729.
【6】Chen Y Y,Tzeng J,Wei I L,et al.Corrosion resistance and mechanical properties of low-alloy steels under atmospheric conditions[J].Corros Sci,2005,47:1001-1021.
【7】吴建华,温秀忭,刘光洲,等.阴极保护对海水间浸低碳钢的防蚀作用[J].中国腐蚀与防护学报,1998,18(2):131-135.
【8】Perkins J,Bornhold R A.The corrosion product morphology dound on sacrificial zinc anodes[J].Corros Sci,1977,17:377-384.
【9】孔小东,陈学群,常万顺,等.干湿交替条件下牺牲阳极保护效果分析[J].材料保护,1998,31(12):35-36.
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