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CORROSION BEHAVIOR OF Q235 CARBON STEEL IN SEAWATER REVERSE OSMOSIS PERMEATE |
LIANG Qinqin1, CAO Shun’an1, YIN Li1, XIAO Li2 |
1. College of Power and Mechanical Engineering, Wuhan University, Wuhan 430072
2. Zhejiang Zheneng Yueqing Power Generation Co. Ltd, Wenzhou 325609 |
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Abstract The corrosion behavior of Q235 steel in seawater reverse osmosis permeate(RO) was investigated by rotation coupon method, SEM, IR and XRD, and electrochemical tests were used for studying the control step and electrode process of corrosion reaction. Experimental results showed that the corrosion rate was speeded up in first 48 h and maintained at 1.4 mm/a afterwards. Initial rust layer was formed by a thin layer of\linebreak γ-FeOOH, and with time passing by, it transformed to a double-layer structure with inner thick Fe3O4 layer and outer α-FeOOH/γ-FeOOH layer. Corrosion process was controlled by cathodic reaction, resistance of which reached peak in initial stage, then reduced rapidly because of conversion of γ-FeOOH to Fe3O4, which provided no inhibition of corrosion and caused high corrosion rate of Q235 steel. As the generation and conversion of γ-FeOOH reached equilibrium on the surface of Q235 steel, corrosion resistance and corrosion rate kept steady.
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Received: 12 October 2011
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Corresponding Authors:
LIANG Qinqin
E-mail: liangqinqin716@gmail.com
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[1] Marangou V S, Savvides K. First desalination plant in cyprus product water aggressivity and corrosion control[J]. Desalination, 2001, 138: 251-258[2] Wei C Z, Shen S R. Application of membrane method seawater desalination technology in Yuhuan power plant[J]. Electric Power Technol. Environ. Prot., 2010, 26(5): 48-49 (韦存忠, 沈隼睿. 膜法海水淡化技术在玉环电厂的应用[J]. 电力科技与环保, 2010, 26(5): 48-49)[3] Li J, Liu G C, Wang W, et al. Research of corrosion resistance of carbon steel in RO desalinated water[J]. Guangzhou Chem. Ind., 2009, 37(4): 95-97 (李敬, 刘贵昌, 王玮等. 碳钢在反渗透水中耐蚀性研究[J]. 广州化工, 2009, 37(4): 95-97)[4] Liu G Z, Zhang X, Hao S L, et al. Corrosion inhibition of seawater reverse osmosis permeate[P]. China: CN101381169 (刘光洲, 张茜, 郝少丽等. 一种海水淡化一级反渗透水的缓蚀方法[P]. 中国: CN101381169)[5] GB/T 18175-2000. Determination of corrosion inhibition performance of water treatment agents-rotation specimen method[S]. Beijing: Standards Press of China, 2001(GB/T 18175-2000. 水处理剂缓蚀性能的测定旋转挂片法[S]. 北京: 中国标准出版社, 2001)[6] Zou Y, Zheng Y Y, Wang Y H, et al. Cathodic electrochemical behaviors of mild steel in seawater[J]. Acta Metall. Sin., 2010, 46(1): 123-128 (邹妍, 郑莹莹, 王燕华等. 低碳钢在海水中的阴极电化学行为[J]. 金属学报, 2010, 46(1): 123-128)[7] Cao C N, Zhang J Q. An Introduction to Electrochemical Impedance Spectroscopy[M]. Beijing: Science Press, 2002 (曹楚南, 张鉴清. 电化学阻抗谱导论[M]. 北京: 科学出版社, 2002)[8] Misawa T, Kyuno T, Suetaka W, et al. The mechanism of atmospheric rusting and the effect of Cu and P on the rust formation of low alloy steels[J]. Corros. Sci., 1971, 11: 35-48[9] Xie Y, Li Y, Sun T, et al. Research on protection performance of γ-FeOOH and α-FeOOH rust layer in-situ growing on Q235 steel[J]. Chin. Sci. Bull., 2008, 53(23): 2848-2855 (谢颖, 李瑛, 孙挺等. 原位生长的纯γ-FeOOH 和α-FeOOH 锈膜对Q235钢保护性能的研究[J]. 科学通报, 2008, 53(23):2848-2855)[10] Hack H P. Galvanic Corrosion[M]. Philadelphia: ASTM, 1988 |
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