CORROSION BEHAVIOR OF LONG–TIME IMMERSED RUSTED CARBON STEEL IN FLOWING SEAWATER

doi:10.3724/SP.J.1037.2012.00258

Acta Metall Sin

2012, Vol. 48

Issue (10): 1260-1266 DOI: 10.3724/SP.J.1037.2012.00258

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CORROSION BEHAVIOR OF LONG–TIME IMMERSED RUSTED CARBON STEEL IN FLOWING SEAWATER

PENG Xin ¹, WANG Jia ^1,2, SHAN Chuan ¹, WANG Haijie ¹, LIU Zaijian ¹, ZOU Yan ³

1.The College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100
2. State Key Laboratory for Corrosion and Protection of Metals, Shenyang 110016
3. Shandong Provincial Key Laboratory of Ocean Environment Monitoring Technology, Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao 266100

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PENG Xin WANG Jia SHAN Chuan WANG Haijie LIU Zaijian ZOU Yan. CORROSION BEHAVIOR OF LONG–TIME IMMERSED RUSTED CARBON STEEL IN FLOWING SEAWATER. Acta Metall Sin, 2012, 48(10): 1260-1266.

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Abstract

The rust/metal structure is one of the multiphase and multiple interface complex systems. The corrosion under rust is the uppermost and longest form of metallic corrosion evolution process. It is difficult to accurately determine the electrochemical parameters because the existence of rust complicates the electrochemical corrosion process. Based on the result of the previous studies of quiescent seawater, the weight–loss method and different electrochemical tests such as polarization curves (PC), electrochemical impedance spectra (EIS) and linear polarization resistance (LPR) were carried out to study the corrosion behavior of A3 carbon steel immersed in flowing seawater for about 280 d. After very short immersing time, there is a thin yellow rust layer on carbon steel, but as time prolonged, the yellow corrosion products are rushed away quickly, and a tense black rust layer cover about the whole electrode. The corrosion rate obtained by weight–loss method show a steady decline and keep stable after about 84 d, but it is higher than that of the static state system data. The cathodic polarization curves show an obvious reduction current peak at about −950 mV, which makes a remarkable overestimating of the cathodic corrosion current. Polarization resistance (Rp), determined by LPR and EIS, increases during the merely short–initial immersion period, then, it decreases gradually with immersion time. This means that the corrosion rate determined by electrochemical tests shows an another pattern compared with the weight–loss result. After a very short immersion time (about 14 d), there is a remarkable deviation between the weight–loss and electrochemical test results, and the longer immersed the greater of this deviation is. So no matter in static state or flowing seawater, electrochemical methods can not get an accurate corrosion rate of carbon steel. And reliable electrochemical measurement and analysis for rusted steel need much more attention.

Key words: carbon steel flowing seawater rust layer corrosion rate deviation

Received: 08 May 2012

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Supported by National Natural Science Foundation of China (No.50971118)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00258 OR https://www.ams.org.cn/EN/Y2012/V48/I10/1260

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