Corrosion behavior of ferritic stainless steel with 15wt% chromium for the automobile exhaust system
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第9期
论文作者：Hua-bing Li Zhou-hua Jiang Hao Feng Hong-chun Zhu Bin-han Sun Zhen Li
文章页码：850 - 860
摘 要：The effect of chloride ion concentration,pH value,and grain size on the pitting corrosion resistance of a new ferritic stainless steel with 15wt% Cr was investigated using the anodic polarization method.The semiconducting properties of passive flms with diferent chloride ion concentrations were performed using capacitance measurement and Mott-Schottky analysis methods.The aging precipitation and intergranular corrosion behavior were evaluated at 400-900℃.It is found that the pitting potential decreases when the grain size increases.With the increase in chloride ion concentration,the doping density and the flat-bland potential increase but the thickness of the space charge layer decreases.The pitting corrosion resistance increases rapidly with the decrease in pH value.Precipitants is identifed as Nb（C,N） and NbC,rather than Cr-carbide.The intergranular corrosion is attributed to the synergistic efects of Nb（C,N） and NbC precipitates and Cr segregation adjacent to the precipitates.
Hua-bing Li，Zhou-hua Jiang，Hao Feng，Hong-chun Zhu，Bin-han Sun，Zhen Li
School of Materials and Metallurgy, Northeastern University
摘 要：The effect of chloride ion concentration,pH value,and grain size on the pitting corrosion resistance of a new ferritic stainless steel with 15wt% Cr was investigated using the anodic polarization method.The semiconducting properties of passive flms with diferent chloride ion concentrations were performed using capacitance measurement and Mott-Schottky analysis methods.The aging precipitation and intergranular corrosion behavior were evaluated at 400-900℃.It is found that the pitting potential decreases when the grain size increases.With the increase in chloride ion concentration,the doping density and the flat-bland potential increase but the thickness of the space charge layer decreases.The pitting corrosion resistance increases rapidly with the decrease in pH value.Precipitants is identifed as Nb（C,N） and NbC,rather than Cr-carbide.The intergranular corrosion is attributed to the synergistic efects of Nb（C,N） and NbC precipitates and Cr segregation adjacent to the precipitates.
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