Studies on waterline corrosion processes and corrosion product characteristics of carbon steel in 3.5 wt% NaCl solution |
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| Authors: | Chuanpeng Li Lunwu Zhang Zhonghai Lu Rui Ding Xiaodong Zhao Bin Wang Hongtao Cui Jie Liu |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Yantai University, Yantai, China;2. Southwest Technology and Engineering Research Institute, Chongqing, China;3. School of Ocean, Yantai University, Yantai, China;4. School of Chemistry and Materials Science, Ludong University, Yantai, China |
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| Abstract: | The waterline corrosion behaviors of carbon steel partially immersed in a 3.5 wt% NaCl solution were investigated using the wire beam electrode technique, and the effects of corrosion products on the processes of waterline corrosion were analyzed. The results demonstrated that the initial stage and development stage of waterline corrosion were mainly controlled by the concentration and diffusion of dissolved oxygen, respectively, and the deceleration stage of waterline corrosion was mainly affected by corrosion products. The main component of the yellow corrosion products was γ-FeOOH, and γ-FeOOH that exhibited a high reduction reactivity could be involved in the cathodic reaction. The black corrosion products were mainly composed of Fe3O4 with strong thermodynamic stability and the processes of dissolved oxygen diffusion and ion transports were obviously affected due to the continuous accumulation of Fe3O4 on the surface of the electrodes. Polarity reversals were observed on the single electrodes below the waterline, but the reasons for the phenomena were different from each other. |
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| Keywords: | carbon steel corrosion products polarity reversal waterline corrosion WBE |
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