Corrosion passive behaviour duplexstainlesssteelat different rates simulated marine-environmentsolution
Shang-lin Lv1 . Zhong-min Yang2 . Bin Zhang2,3 . Jie Chen1 . Ying Chen2 . Xiao-bin Li1
1 National Construction Steel Quality Supervision and Test Centre, Central Research Institute of Building and Construction Co., Ltd., Beijing 100088, China 2 Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China 3 China University of Pertroleum–Beijing, Beijing 102249, China
Corrosion passive behaviour duplexstainlesssteelat different rates simulated marine-environmentsolution
Shang-lin Lv1 . Zhong-min Yang2 . Bin Zhang2,3 . Jie Chen1 . Ying Chen2 . Xiao-bin Li1
1 National Construction Steel Quality Supervision and Test Centre, Central Research Institute of Building and Construction Co., Ltd., Beijing 100088, China 2 Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China 3 China University of Pertroleum–Beijing, Beijing 102249, China
摘要 The corrosion and passive behaviour of duplex stainless steel 2205 at six cooling rates (1, 5, 10, 15, 20 Cs -1 and water quenched) in a simulated marine-environment solution was investigated using electrochemical measurements of poten-tiostatic critical pitting temperature, potentiodynamic polarisation curves, electrochemical impedance spectroscopy and Mott–Schottky curves. The microstructural evolution and pitting morphologies of the specimens were visualised using an optical microscope and scanning electron microscope. The electrochemical responses of the passive .lm show that passivity of the steel was enhanced as the cooling rate increased; however, the threshold cooling rate was 20 Cs -1, beyond which pitting corrosion resistance remained stable. Based on the analyses of microstructural evolution and pit morphologies, the proportion of the ferrite phase increased with the cooling rate and the ratio of austenite and ferrite was close to 1:1. The pitting size decreased as the cooling rate increased, and most metastable pits on specimens were located in the ferrite phase and on the ferrite–austenite interface. Thus, pitting resistance of steel is governed by the phase that provides the lowest pitting resistance equivalent number. The optimised pitting corrosion resistance for steel 2205 was achieved when it was greater than or equal to 20 Cs -1.
Abstract：The corrosion and passive behaviour of duplex stainless steel 2205 at six cooling rates (1, 5, 10, 15, 20 Cs -1 and water quenched) in a simulated marine-environment solution was investigated using electrochemical measurements of poten-tiostatic critical pitting temperature, potentiodynamic polarisation curves, electrochemical impedance spectroscopy and Mott–Schottky curves. The microstructural evolution and pitting morphologies of the specimens were visualised using an optical microscope and scanning electron microscope. The electrochemical responses of the passive .lm show that passivity of the steel was enhanced as the cooling rate increased; however, the threshold cooling rate was 20 Cs -1, beyond which pitting corrosion resistance remained stable. Based on the analyses of microstructural evolution and pit morphologies, the proportion of the ferrite phase increased with the cooling rate and the ratio of austenite and ferrite was close to 1:1. The pitting size decreased as the cooling rate increased, and most metastable pits on specimens were located in the ferrite phase and on the ferrite–austenite interface. Thus, pitting resistance of steel is governed by the phase that provides the lowest pitting resistance equivalent number. The optimised pitting corrosion resistance for steel 2205 was achieved when it was greater than or equal to 20 Cs -1.
SHANGLIN -Lv,YANG Zhong-Min,BIN -Zhang, et al. Corrosion passive behaviour duplexstainlesssteelat different rates simulated marine-environmentsolution[J]. Journal of Iron and Steel Research International, 2018, 25(9): 943-953.
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2018, Vol. 25 
