咪唑啉季铵盐对A3碳钢在NaNO2+NaCl溶液中点蚀行为的影响
Influence of an Imidazoline Quaternary Ammonium Salt on Pitting Corrosion of Carbon Steel in NaNO22+NaCl Solution
摘 要
利用慢速动电位极化法、Mott-Schottky曲线、X射线光电子能谱(XPS)、扫描电化学显微镜(ESTM)等方法研究了咪唑啉季铵盐对A3碳钢在含NO2-的NaCl溶液中的点蚀行为.结果表明,咪唑啉季铵盐能对碳钢在NaNO2+NaCl溶液中钝化起到一定的促进作用,降低维钝电流密度;通过吸附于碳钢表面,降低n型半导体钝化膜层内的施主浓度,改善碳钢表面钝化膜的耐蚀性,尽管对稳态点蚀电位影响不大,但如果添加适量,能较明显地促进稳态蚀孔的再钝化,较适宜的咪唑啉季铵盐添加量约为40 mg/L.
点蚀
咪唑啉季铵盐
耐蚀性
carbon steel
pitting corrosion
imidazoline quaternary ammonium salt
corrosion resistance
Abstract
The effect of an imidazoline quaternary ammonium salt on pitting corrosion of Q235 carbon steel in a NaNO2 + NaCl solution was studied by polarization curves,Mott-Schottky curves,XPS and ESTM methods.The results showed that the imidazoline quaternary ammonium salt could accelerate the formation of the passive film on carbon steel surface in a NaNO2+NaCl solution and decrease the passive current;the imidazoline quaternary ammonium salt absorbed on carbon steel surface could also decrease the donor concentration in passive films and improve the film′s corrosion resistance;though imidazoline quaternary ammonium salt had no obvious influence on pitting potential,it was helpful for repassivation of stable pit with a proper quantity (e.g.40 mg/L).
中图分类号 TG174.42
所属栏目 缓蚀剂专题
基金项目 国家自然科学基金(51171014;51210001)
收稿日期 2014/6/27
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备注赵旭辉(1972-),副教授,博士,从事防腐蚀相关工作.
引用该论文: ZHAO Xu-hui,WANG Fang,ZHOU Yong,TANG Yu-ming,ZUO Yu. Influence of an Imidazoline Quaternary Ammonium Salt on Pitting Corrosion of Carbon Steel in NaNO22+NaCl Solution[J]. Corrosion & Protection, 2015, 36(2): 113
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【7】陈国浩.二氧化碳腐蚀体系缓蚀剂的缓蚀机理及缓蚀协同效应研究[D].北京:北京化工大学博士学位论文,2012.
【8】LI W S,LUO J L.Electric properties and pitting susceptibility of passive films formed on iron in chromate solution[J].Electrochemistry Communications,1999(1):349-353.
【9】林玉华,杜荣归,胡融刚,等.不锈钢钝化膜耐蚀性与半导体特性的关联研究[J].物理化学学报,2005,21(7):740-745.
【10】张云莲,史美伦,陈志源.钢筋钝化膜半导体性能的Mott-Schottky研究[J].机械工程材料,2006,30(7):7-10.
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