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Effect of pH on Corrosion Behavior of 14Cr12Ni3WMoV Stainless Steel in Chlorine-containing Solutions |
RAN Dou1,2, MENG Huimin1, LIU Xing1,2, 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 pH value on the electrochemical corrosion behavior of 14Cr12Ni3WMoV steel, which is often used for steam turbine final blade, in acidic chlorine-containing solutions was investigated by open circuit potential measurement, potentiodynamic polarization, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results show that with the decrease of pH value of acidic chlorine-containing solutions, the impedance of the steel surface decreases, while the corrosion rate and pitting sensitivity increase. When pitting occurs, the vertical growth of pits on the steel surface slowed down, while their lateral growth accelerated without obvious uniform corrosion. The passivation film of 14Cr12Ni3WMoV stainless steel is mainly composed of oxides and hydroxides of Fe and Cr in the solution of pH5, while the passivation film is mainly composed of hydroxides and oxides of Cr and corresponding compounds of high valence state Mo6+ in the solution of pH2. With the decrease in pH value of the acidic chlorine-containing solution, the dissolution of Fe in the passivation film on the steel is accelerated significantly, so that the stability of the passivation film decreases, thereby the corrosion resistance of the stainless steel decreases.
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Received: 25 September 2020
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Fund: Sichuan Applied Foundation Project(2019YJ0699);Project of State Key Laboratory of Long-life;High Temperature Materials(DTCC28EE190230) |
Corresponding Authors:
LI Quande,LONG Bin
E-mail: quandelee@126.com;longbin@dongfang.com
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Cite this article:
RAN Dou, MENG Huimin, LIU Xing, LI Quande, GONG Xiufang, NI Rong, JIANG Ying, GONG Xianlong, DAI Jun, LONG Bin. Effect of pH on Corrosion Behavior of 14Cr12Ni3WMoV Stainless Steel in Chlorine-containing Solutions. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 51-59.
URL:
https://www.jcscp.org/EN/10.11902/1005.4537.2020.175 OR https://www.jcscp.org/EN/Y2021/V41/I1/51
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