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| Corrosion Electrochemical Parameters Test of Rusted Carbon Steel in Seawater |
PENG Xin1, WANG Jia1,2, WANG Jinlong1, SHAN Chuan1, JIA Honggang3,
LIU Zaijian1, WANG Haijie1 |
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research , Chinese Academy of Sciences, Shenyang 110016, China;
3. Offshore Oil Engineering Co. (Qingdao) LTD., Qingdao 266100, China |
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Abstract As it is known that the existence of a rust scale on a steel surface may complicate the electrochemical corrosion process of the steel, thereby it is difficult to accurately measure the corrosion rate of carbon steel by traditional electrochemical methods. In this paper, weight-loss method and different electrochemical tests such as polarization curves (PC), electrochemical impedance spectra (EIS) and linear polarization resistance (LPR) were used to study the corrosion behavior of the Q235 carbon steel immersed in seawater for 1 a. The results show that the corrosion rates measured by both the electrochemical and weight-loss measurement show the same degressive trends during a short immersion period (for about 8 weeks), while those measured by electrochemical measurement turn to increase after 8 weeks' immersion in seawater. The longer the immersion time is, the bigger the deviation occurs for the corrosion rates measured by the two kind methods. It is believed that the rust scale presented on the electrodes had a great influence on its corrosion behavior. The evolution of phase constituents of the corrosion products on the rust steel was characterized by XRD. There is an obvious increasing of β-FeOOH in the corrosion product accumulated on the carbon steel with the immersing time going, and the reductive reaction of β-FeOOH during the electrochemical test process leads an overestimate of the corrosion rate, which caused the deviation between weight loss method and electrochemical tests. In order to solve this problem, the electrode was pretreated by a cathodic galvanostatic polarization with current density of -25 μAcm-2 to counteract the reduction current during the electrochemical test process. After the pre-polarization, the electrochemical measurement results coincided well with weight loss, which means this pre-polarization showed a good calibration of the deviation between the two measurement methods.
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Received: 29 March 2013
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Cite this article:
PENG Xin,WANG Jia,,WANG Jinlong,SHAN Chuan,JIA Honggang,
LIU Zaijian,WANG Haijie. Corrosion Electrochemical Parameters Test of Rusted Carbon Steel in Seawater. Journal of Chinese Society for Corrosion and protection, 2013, 33(6): 449-454.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I6/449
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