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Journal of Chinese Society for Corrosion and protection  2012, Vol. 32 Issue (5): 412-416    DOI:
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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.

Key words:  seawater desalination      reverse osmosis permeate      Q235 steel      corrosion     
Received:  12 October 2011     
ZTFLH:  TG172  
Corresponding Authors:  LIANG Qinqin     E-mail:  liangqinqin716@gmail.com

Cite this article: 

LIANG Qinqin, CAO Shun’an, YIN Li, XIAO Li. CORROSION BEHAVIOR OF Q235 CARBON STEEL IN SEAWATER REVERSE OSMOSIS PERMEATE. Journal of Chinese Society for Corrosion and protection, 2012, 32(5): 412-416.

URL: 

https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2012/V32/I5/412

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