摘要:
采用点腐蚀试验、电化学腐蚀试验和晶间腐蚀试验对409L,409M,410L,410S四种低铬铁素体不锈钢的耐腐蚀能力进行评定,并使用扫描电镜对试验用不锈钢的表面腐蚀情况进行形貌观察及成分分析,结果表明:由于Nb和Ti稳定化元素的添加,409型低铬不锈钢可获得较低的腐蚀速率,而无添加Nb和Ti稳定化元素的410型铁素体不锈钢具有较高的腐蚀速率;由于含镍钛夹杂物TiS、Ti(CN)和Nb(CN)的存在,409型不锈钢主要发生点蚀和晶间腐蚀等局部腐蚀;而无稳定化元素的410型不锈钢试样表面更易发生全面腐蚀。
关键词:
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低铬铁素体不锈钢 /
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铌 /
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钛 /
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腐蚀试验 /
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耐蚀性
Abstract:
The corrosion resistance of low-chrome ferritic stainless 409 L,409 M,410 L,410 S were evaluated by the chemical immersion erosion test,electrochemical corrosion test and intergranular corrosion test,and morphology and component analysis of corrosion film on the tested stainless steels’ surface were studied by Scanning Electron Microscopy.Compared with type 410 stainless steels,the corrosion rate of type 409 stainless steels is obviously decreased by the addition of Nb and Ti.Due to the existence of inclusions containing Nb and Ti,for example TiS,Ti（CN）and Nb（CN）,the pitting corrosion and intergranular corrosion resistance performances of type 409 stainless steels are observed,but type 410 stainless steels is readily to produce the general corrosion.
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