000Cr25Ni20奥氏体不锈钢在硝酸溶液中的腐蚀电化学行为
Electrochemical Corrosion Behavior of 000Cr25Ni20 Austenitic Stainless Steel in Nitric Acid Solution
摘 要
研究了000Cr25Ni20奥氏体不锈钢在不同温度和不同浓度硝酸中的腐蚀电化学行为,发现随着硝酸浓度和温度的升高,000Cr25Ni20不锈钢在溶液中的自腐蚀电位向过钝化区移动,钝化区范围变小.钝化电位下,000Cr25Ni20不锈钢的电化学阻抗谱呈容抗特征,容抗弧半径较大:同一外加钝化电位下硝酸浓度对阻抗谱的影响不明显:在钝化/过钝化过渡区,伴随晶间腐蚀的出现,阻抗谱在低频段出现感抗特征,随着钝化膜极化阻值的急剧减小,高频段的容抗半径大幅度减小.
硝酸
电化学
钝化
000Cr25Ni20 stainless steel
nitric acid
electrochemical corrosion
passivation
Abstract
The electrochemical corrosion behavior of 000Cr25Ni20 austenitic stainless steel in nitric acid solution at different temperatures and in different concentrations were investigated.The results showed that the free corrosion potential of 000Cr25Ni20 stainless steel was shifted towards to transpassive zone and the range of the passive zone reduced with the rise of both nitric acid concentration and temperature.At passive potential,a capacitive loop with great value of radius appeared in the electrochemical impedance spectroscopy (EIS).The influence of nitric acid concentration on the EIS was not obvious at the same passive potential.In passive/transpassive transition zone,with intergranular corrosion occurred,a inductive loop appeared at low frequency area.The radius of the capacitive loop at high frequency decreased sharply because of the impedance value of passive film severely decreasing.
中图分类号 TG172.6+3 TG142.7
所属栏目 试验研究
基金项目
收稿日期 2010/2/22
修改稿日期 2010/3/15
网络出版日期
作者单位点击查看
联系人作者赵吉庆(sdu.zjq@126.com)
引用该论文: WANG Wei,ZHAO Ji-qing,ZHANG Qi-fu. Electrochemical Corrosion Behavior of 000Cr25Ni20 Austenitic Stainless Steel in Nitric Acid Solution[J]. Corrosion & Protection, 2010, 31(12): 939～941
被引情况:
【1】颜润浦,赵吉庆,杨钢,赵西成,杨西荣, "工业纯钛在盐酸中的腐蚀行为",腐蚀与防护 36, 182-186(2015)
【2】王梅丰,魏红阳,陈东初,万斌,倪磊,刘桂宏,李光东, "表面粗糙度对硝酸钝化304不锈钢点蚀行为影响",腐蚀与防护 36, 1156-1160(2015)
【3】徐一慧,孔令真,路伟,徐光远,王奎升, "304不锈钢在硝酸环境中的腐蚀电化学行为",腐蚀与防护 36, 905-909(2015)
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参考文献
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【2】Fauvet P,Balbaud F,Robin R.Corrosion mechanisms of austenitic stainless steels in nitric media used in reprocessing plants[J].Journal of Nuclear Materials,2008,375(1):52-64.
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