咪唑啉季铵盐对A3碳钢在NaNO_2+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 NaNO_2+NaCl Solution

作　　者：赵旭辉[1] 王芳[1] 周勇[1] 唐聿明[1] 左禹[1] 

机构地区：[1]北京化工大学材料科学与工程学院材料电化学过程与技术北京市重点实验室,北京100029

出　　处：《腐蚀与防护》2015年第2期113-117,共5页Corrosion & Protection

基　　金：国家自然科学基金(51171014;51210001)

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40mg/L。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.40mg/L）.

关 键 词：碳钢 点蚀 咪唑啉季铵盐 耐蚀性 

分 类 号：TG174.42[金属学及工艺—金属表面处理]