冷凝液硫含量对SUS444铁素体不锈钢腐蚀行为的影响  

Effect of sulfur content in condensate on the corrosion performance of SUS444 ferritic stainless steel

作　　者：但佳永 周和荣[1] 刘鹏洋[1] Dan Jiayong;Zhou Herong;Liu Pengyang(College of Materials Science and Metallurgical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《武汉科技大学学报》2019年第1期13-21,共9页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(50971048);国家科技基础条件平台专题(汽车腐蚀专项)

摘　　要：利用冷凝液浸蚀-高温氧化循环腐蚀法模拟汽车排气系统内部服役环境,借助失重分析、腐蚀形貌观察及腐蚀产物分析,研究了SUS444不锈钢在不同硫含量的冷凝液中的腐蚀行为。结果表明,随着腐蚀循环次数的增加,不锈钢表面不断沉积的FeSO_4·7H_2O、Fe(NH_4)(SO_4)_2及Fe_4(SO_4)_5(OH)_2·18H_2O等硫酸盐物质加速了不锈钢的腐蚀进程,其点蚀深度及腐蚀速率均随冷凝液中硫含量的升高而增加。A condensate immersion/high temperature oxidation cyclic method was employed to simulate internal service environment of automotive exhaust system.Based on the weight loss method,corrosion morphology observation and corrosion product analysis,the effect of sulfur content in the condensate on the corrosion performance of SUS444stainless steel was investigated.The results show that the deposited sulfates on the surface of the stainless steel such as FeSO4·7H2O,Fe(NH4)(SO4)2and Fe4(SO4)5(OH)2·18H2O can accelerate the process of steel corrosion with the increasing time of cycles,and pitting depth and corrosion rate rise with increasing sulfur content in the condensate.

关 键 词：铁素体不锈钢 冷凝液 硫含量 腐蚀行为 循环腐蚀 点蚀 

分 类 号：TG171[金属学及工艺—金属表面处理]