Mo、Mn元素对SUS430LX铁素体不锈钢点蚀的影响  

Effect of Mo and Mn on Pitting of SUS430LX Stainless Steel

作　　者：黄志涛[1] 田文怀[2] 锁红波[1] 

机构地区：[1]中航工业北京航空制造工程研究所,北京100024 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《失效分析与预防》2015年第5期269-273,共5页Failure Analysis and Prevention

摘　　要：为了研究汽车排气系统中消音器腐蚀穿孔失效的原因,以具有不同化学成分的铁素体不锈钢为研究对象,利用体视显微镜、金相显微镜和计算机联合X射线微区分析仪,研究了尾气凝结水对SUS430LX铁素体不锈钢点蚀的影响。结果表明:消音器在凝结水的作用下发生了严重的点蚀穿孔现象;其腐蚀产物主要为Fe、Cr的氧化物以及少量Fe与S、Cl元素生成的化合物;增加不锈钢中Mo、Mn元素含量,可有效提高SUS430LX不锈钢的耐点蚀性能。In order to investigate the mechanism of pitting corrosion of perforated muffle in auto exhaust system,the effect of condensed water on SUS430 LX ferritic stainless steel was studied with a stereomicroscope,an optical microscope（ OM）,and a computer-aided X-ray micro-analyzer（ CMA）. The results show that the pitting corrosion occurred on the surface of muffle.Corrosion products are made of oxide of Fe and Cr as well as a small quantity of sulfide and chloride of Fe. The pitting corrosion resistance of SUS430 LX ferritic stainless steel is improved by increasing the contents of Mo and Mn.

关 键 词：消音器 凝结水 铁素体不锈钢 点蚀 

分 类 号：TG174.1[金属学及工艺—金属表面处理]