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| Effect of Sn on Corrosion Behavior of Ultra-pure 17 mass% Cr Ferritic Stainless Steels in Sulphuric Acid |
| Xiang-jun ZHANG1,Fei GAO2,Zhen-yu LIU1 |
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
2. School of Material and Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The effect of Sn on corrosion behavior of ferritic stainless steels in 20 mass% H2SO4 was investigated by alternating current and direct current electrochemical methods and gravimetric tests at 25 ��. The results show that Sn can effectively improve general corrosion resistance of ferritic stainless steels in H2SO4, mainly due to highly raised hydrogen evolution overpotential which is in favour of strong suppression of hydrogen evolution reaction, and inhibitive effect of dissolved Sn2+ on elementary anodic reactions. With increasing Sn content, the better corrosion resistance can be reached. The Electrochemical Impedance Spectroscopy (EIS) includes four time constants and can be perfectly fitted by equivalent circuit: Rs(CdlRct)(QadsRads(RL1(L1(RL2L2)))).
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Received: 19 February 2016
Published: 18 October 2016
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| Fund:National Science-technology Support Plan Project;National Natural Science Found Project |
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Corresponding Authors:
Xiang-Jun ZHANG
E-mail: zh.xj.good@163.com
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2016, Vol. 23 
