侵蚀性阴离子对A3钢腐蚀电化学行为的影响  

Effect of Aggressive Anions on Corrision Behavior of A3 Steel

作　　者：张治国[1] 吴明[1] 陈旭[1] 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,抚顺113001

出　　处：《腐蚀与防护》2011年第8期609-612,共4页Corrosion & Protection

基　　金：国家自然科学基金项目(No.50771053)

摘　　要：利用电化学阻抗谱和极化曲线研究了A3钢在不同浓度的Cl^-、SO_4^(2-)、S^(2-)溶液中的腐蚀行为。结果表明,阴离子Cl^-、SO_4^(2-)、S_4^(2-)对A3钢腐蚀速率影响较大。且在相同浓度下腐蚀速率的排序为:S2^->Cl^->SO_4^(2-)。随着Cl^-、SO_4^(2-)、S^(2-)浓度的增加,腐蚀电位负移,腐蚀电流逐渐增大,阻抗弧半径减小,阻抗减小,腐蚀加剧。混合的侵蚀性离子对A3钢腐蚀速率影响依次为:S^2+Cl^->SO_4~2+S^(2-)>SO_4^(2-)+Cl^-。The corrosion behviors of A3 steel in water with different concentrations of Cl^-, SO4 ^2- and S^2- were studied by electrochemical impedance spectroscopy and polarization curves. The results show that Cl^-, SO4^2- and S^2- impact the corrosion of A3 steel greatly. At the same concentration, the corrosion rate could be ranked in the order of S^2- 〉 Cl^- 〉 SO4^2-. The corrosion potential shifted towards negative direction and the corrosion current increased gradually with the increase of S^2-, Cl^- and SO4^2- concentration. The impedance decreased and the corrosion increased. The corrosion rate of the mixed corrosive anions could be ranked in the order of S^2- ＋ Cl^-〉SO4^2- ＋ S^2-〉 SO4^2- ＋ Cl^-.

关 键 词：腐蚀电流 腐蚀 模拟水样 

分 类 号：TG172.6[金属学及工艺—金属表面处理] TG174.3[金属学及工艺—金属学]