Evaluation of Water-line Area Corrosion for Q235 Steel by WBE Technique

doi:10.11902/1005.4537.2013.247

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (5): 451-458 DOI: 10.11902/1005.4537.2013.247

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Evaluation of Water-line Area Corrosion for Q235 Steel by WBE Technique

CHEN Yalin^1,^2,³, ZHANG Wei^2,³(

), WANG Wei¹, WANG Jia^1,⁴, WANG Qi¹, CAI Guangxu¹

1. College of Chemistry and Chemical Engineering,Ocean University of China, Qingdao 266100, China
2. Qingdao Institute of Marine Corrosion, Qingdao 266071, China
3. NCS Testing Technology Co., Ltd, Qingdao 266071, China
4. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

The water-line area corrosion of carbon steel in 3.5%NaCl solution was studied by me- ans of wire beam electrode (WBE) technique. The corrosion current distribution was regularly measured over a period of 40 d. In the initial stage, it was found that, down from the waterline, the anodic current increased gradually. This indicated that an oxygen concentration cell had been formed already. But the cathode region and anode region were mixed up in this stage. With the progress of the corrosion process, the cathode region was located near the waterline and the anode region was located beneath the cathode region. As the cathodic reaction above the waterline was speeding up, the corrosion region extended from the lower portion of the electrode upward to the waterline and thus the corrosion rate of whole electrode increased. In the smooth stage of corrosion, the main cathode region was located above the waterline and the corrosion rate became stable. This work confirms the applicability of the WBE method for the study of water-line corrosion. This method can especially provide information concerning the evolution of the corrosion current distribution of the electrode, which can not be acquired by the traditional technique with a bulk electrode of long steel strip.

Key words: water-line corrosion wire beam electrode corrosion of metal current distribution

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Cite this article:

CHEN Yalin, ZHANG Wei, WANG Wei, WANG Jia, WANG Qi, CAI Guangxu. Evaluation of Water-line Area Corrosion for Q235 Steel by WBE Technique. Journal of Chinese Society for Corrosion and protection, 2014, 34(5): 451-458.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2013.247 OR https://www.jcscp.org/EN/Y2014/V34/I5/451

Fig.1 Photo of WBE's surface (a) and profile near waterline (b)

Fig.2 Current density distribution maps of the WBE surface after immersion for 2 h (a), 12 h (b), 2 d (c), 6 d (d), 18 d (e) and 40 d (f)

Fig.3 Current density of each row after immersion for 2 h (a), 12 h (b), 2 d (c), 6 d (d), 18 d (e) and 40 d (f)

Fig.4 Change of the anode current density during the immersion process

Fig.5 Corrosion morphologies of WBE's surface after immersion for 4 d (a), 18 d (b) and 40 d (c)

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