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含Cl^-溶液中SO4^2-对316不锈钢临界点蚀温度的影响
引用本文:廖家兴,蒋益明,吴玮巍,钟澄,李劲,宋洪伟.含Cl^-溶液中SO4^2-对316不锈钢临界点蚀温度的影响[J].金属学报,2006,42(11):1187-1190.
作者姓名:廖家兴  蒋益明  吴玮巍  钟澄  李劲  宋洪伟
作者单位:[1]复旦大学材料科学系,上海200433 [2]宝山钢铁股份有限公司技术中心,上海201900
基金项目:国家自然科学基金项目50571027和上海市科委纳米专项基金项目0452nm004资助
摘    要:采用外加恒电位下腐蚀电流-温度扫描方法研究了在0.5%Cl^-溶液中,SO4^2-浓度对316不锈钢点腐蚀行为的影响.结果表明,随着SO4^2-浓度的增加,钝化电流增加,开路电位降低.当SO4^2-浓度低于0.42%时,316不锈钢的临界点蚀温度比不存在SO4^2-时的临界点蚀温度低;当SO4^2-浓度大于0.42%时,临界点蚀温度比不存在SO4^2-时的临界点蚀温度高.从离子竞争吸附的角度进行分析,对SO4^2-加速与抑制点蚀两种作用规律的形成原因进行了解释.

关 键 词:不锈钢  临界点蚀温度  硫酸根离子  氯离子  竞争吸附
文章编号:0412-1961(2006)11-1187-04
收稿时间:2006-03-22
修稿时间:2006-03-222006-06-05

INFLUENCE OF SO4^2- IN AQUEOUS SOLUTION CONTAINING Cl^- ON THE CRITICAL PITTING CORROSION TEMPERATURE OF 316 STAINLESS STEEL
LIAO Jiaxing, JIANG Yiming, WU Weiwei, ZHONG Cheng, LI Jin ,SONG Hongwei.INFLUENCE OF SO4^2- IN AQUEOUS SOLUTION CONTAINING Cl^- ON THE CRITICAL PITTING CORROSION TEMPERATURE OF 316 STAINLESS STEEL[J].Acta Metallurgica Sinica,2006,42(11):1187-1190.
Authors:LIAO Jiaxing  JIANG Yiming  WU Weiwei  ZHONG Cheng  LI Jin  SONG Hongwei
Affiliation:1.Department of Materials Science, Fudan University, Shanghai 200433;2.Technology Center of Bao Steel Ltd., Shanghai 201900
Abstract:The influence of SO42- on the pitting corrosion behavior of 316 stainless steel has been studied by measuring the relationship of corrosion current and temperature in 0.5% Cl- solutions with different concentrations of SO42- at constant applied potentials. The results showed that with the increase of SO42- concentration, the passivation current increased and the open circuit potential decreased; When the concentration of SO42- was less (more) than 0.42%, the critical pitting temperature was lower (higher) than that without SO42-. The inhibition and acceleration effects of SO42- on the pitting corrosion were discussed by analyzing the mechanism of the ion-competitive adsorption.
Keywords:stainless steel  critical pitting temperature  SO4^2-  Cl^- competitive absorption
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