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| Corrosion Behaviors of 904L Austenite Stainless Steel in Concentrated Sulfuric Acid Containing Hydrofluoric Acid |
| ZENG Hongtao1,2, XIANG Song1,2, LIU Songlin3, HE Yonggang3 |
1. School of Materials and Metallurgy, Guizhou University, Guiyang 550003, China;
2. Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guiyang 550003, China;
3. Wengfu Lantian Fluorine Chemical Co., Ltd., Fuquan 550508, China |
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Abstract Potentiodynamic polarization curves, cyclic polarization curves and electrochemical impedance spectroscopy (EIS) were used to investigate the corrosion behaviors of 904L stainless steel in concentrated sulfuric acid containing hydrofluoric acid. The result shows that the corrosion of 904L stainless steel in concentrated sulfuric acid is inhibited when the mass fraction of hydrofluoric acid is less than 2%; while the corrosion is promoted when the mass fraction of hydrofluoric acid is higher than 2%. With the increase of hydrofluoric acid concentration, the corrosion controlling step changes from electrochemical reaction to mixed mass transportation-electrochemical reaction. EIS and the plots present the change of time contant from one to two, i.e. capacitance loop in high frequency and inductance loop in low frequency.
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Cite this article:
ZENG Hongtao,XIANG Song,LIU Songlin,HE Yonggang. Corrosion Behaviors of 904L Austenite Stainless Steel in Concentrated Sulfuric Acid Containing Hydrofluoric Acid. Journal of Chinese Society for Corrosion and protection, 2013, 33(3): 182-187.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I3/182
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