409不锈钢在消声器冷凝液中的腐蚀行为  

Corrosion Behavior of 409 Ferritic Stainless Steel in Condensate Solution of Automotive Mufflers

作　　者：阮伟慧[1] 王士栋[1] 李谋成[1] 沈嘉年[1] 

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《腐蚀科学与防护技术》2012年第4期301-304,共4页Corrosion Science and Protection Technology

基　　金：国家自然科学基金重点项目(51134010)资助

摘　　要：运用氧化-冷凝液蒸发循环方法模拟汽车消声器内腐蚀环境,研究了409不锈钢在两种冷凝液中的腐蚀行为,并分析了Cl-对冷凝液腐蚀的作用.结果表明,经250℃氧化后409不锈钢在冷凝液中表现出良好的钝态腐蚀性能,但无论冷凝液中是否存在Cl-,钝化膜在氧化和腐蚀的循环作用下均会被破坏而形成局部腐蚀坑.Cl-存在时,蚀坑内不易形成保护性氧化膜,形成的蚀坑更深.The corrosion behavior of 409 ferritic stainless steel in two kinds of condensate solution with or without Cl-was investigated to analyze the corrosion effect of Cl-in condensate solution by applying cyclic oxidation-condensate evaporation method,which simulated the corrosive environment inside automotive exhaust mufflers.The results of electrochemical tests in both solutions showed that passive films formed first after oxidation at 250 ℃,then was deteriorated during the cyclic oxidation and evaporation process,forming pitting due to localized corrosion.However,the presence of Cl-in the solution retarded the formation of protective oxide film in the pits,and further promoted the growth of pitting.

关 键 词：409不锈钢 汽车排气系统 冷凝液 腐蚀 电化学阻抗谱 

分 类 号：TG172[金属学及工艺—金属表面处理]