Corrosion behavior of ferritic stainless steel with 15wt% chromium for the automobile exhaust system
查看参考文献28篇
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文摘
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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 films with different 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°C. 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 identified as Nb(C,N) and NbC, rather than Cr-carbide. The intergranular corrosion is attributed to the synergistic effects of Nb(C,N) and NbC precipitates and Cr segregation adjacent to the precipitates. |
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来源
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International Journal of Minerals
, Metallurgy and Materials,2013,20(9):850-860 【核心库】
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DOI
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10.1007/s12613-013-0806-4
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关键词
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ferritic stainless steel
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corrosion resistance
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pitting
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chlorides
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intergranular corrosion
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grain size
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地址
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School of Materials and Metallurgy, Northeastern University, Shenyang, 110004
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1674-4799 |
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学科
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冶金工业 |
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基金
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supported by the Program for Liaoning Innovative Research Team in University
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the Fundamental Research Funds for the Central Universities
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the General Scientific Research Project of the Department of Education of Liaoning Province, China
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文献收藏号
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CSCD:4932755
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28
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