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| Effect of Temperature on Corrosion Behavior of 14Cr12Ni3-WMoV Stainless Steel in 0.02 mol/L NaCl Solution |
RAN Dou1,2, MENG Huimin1, LI Quande1,2,3( ), GONG Xiufang2,3, NI Rong2,3, JIANG Ying2,3, GONG Xianlong2,3, DAI Jun2,3, LONG Bin2,3() |
1.Institute of Advance Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2.State Key Laboratory of Long-life High Temperature Materials, Deyang 618000, China
3.Dongfang Turbine Co. , Ltd. , Deyang 618000, China |
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Abstract The effect of temperature on the corrosion behavior of 14Cr12Ni3WMoV stainless steel for the final stage blade of steam turbine in 0.02 mol/L NaCl solution was studied by means of electrochemical techniques including open circuit potential measurement, potentiodynamic polarization measurement and electrochemical impedance spectroscopy, as well as laser scanning confocal microscopy and scanning electron microscopy coupled with energy dispersive spectroscopy. The results show that with the increasing temperature, both the corrosion tendency and corrosion rate of 14Cr12Ni3WMoV stainless steel increase. Meanwhile, its pitting sensitivity increases with weakened self-repairing ability of its passivation film, thus the corrosion resistance of the steel decreases. The corrosion pit develops faster in the radial direction，but its development in depth slows down with the increasing temperature. When pitting occurs, Fe, Cr, Ni, W, Mo and V in the steel selectively dissolve, demonstrating that Fe and Ni dissolve quickly, while Cr, W, Mo and V are enriched in the corrosion pit due to their slow dissolution, whereas the change of temperature has no obvious effect on the enrichment of Cr, W, Mo and V.
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Received: 23 April 2020
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| Fund: Sichuan Applied Foundation Project(2019YJ0699);Project of State Key Laboratory of Long-life High Temperature Materials(DTCC28EE190230) |
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Corresponding Authors:
LI Quande,LONG Bin
E-mail: quandelee@126.com;longbin@dongfang.com
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About author: LI Quande, E-mail: quandelee@126.com
LONG Bin, E-mail: longbin@dongfang.com
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Cite this article:
RAN Dou, MENG Huimin, LI Quande, GONG Xiufang, NI Rong, JIANG Ying, GONG Xianlong, DAI Jun, LONG Bin. Effect of Temperature on Corrosion Behavior of 14Cr12Ni3-WMoV Stainless Steel in 0.02 mol/L NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 362-368.
URL:
https://www.jcscp.org/EN/10.11902/1005.4537.2020.073 OR https://www.jcscp.org/EN/Y2021/V41/I3/362
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