Effect of Sn on Corrosion Behavior of Ultra-pure 17 mass% Cr Ferritic Stainless Steels in Sulphuric Acid  

作　　者：Xiang-jun ZHANG Fei GAO Zhen-yu LIU 

机构地区：[1]State Key Laboratory of Rolling and Automation,Northeastern University [2]School of Material and Metallurgy,Northeastern University

出　　处：《Journal of Iron and Steel Research International》2016年第10期1044-1053,共10页

基　　金：Item Sponsored by National Science-technology Support Plan Project of China(2012BAE04B02);National Natural Science Foundation of China(51271050);China Postdoctoral Science Foundation(2015M581346);Foundamental Research Funds for the Central Universities of China(N150203002)

摘　　要：The effect of Sn on corrosion behavior of ferritic stainless steels in 20mass% 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 Sn^2＋ 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））））.The effect of Sn on corrosion behavior of ferritic stainless steels in 20mass% 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 Sn^2＋ 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））））.

关 键 词：stainless steel TIN sulphuric acid general corrosion hydrogen overpotential 

分 类 号：TG172.63[金属学及工艺—金属表面处理]