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| Corrosion Behavior of S420 Steel in Different Marine Zones |
MA Heng1, TIAN Huiyun2( ), LIU Yuxi3, WANG Yuexiang1, HE Kang1, CUI Zhongyu2, CUI Hongzhi2 |
1. Yinshan Section Steel Corporation of Laiwu Steel Group Ltd., Jinan 271104, China
2. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
3. College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China |
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Cite this article:
MA Heng, TIAN Huiyun, LIU Yuxi, WANG Yuexiang, HE Kang, CUI Zhongyu, CUI Hongzhi. Corrosion Behavior of S420 Steel in Different Marine Zones. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 635-644.
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Abstract The effect of diverse marine zones on the corrosion behavior of low alloy steels exhibits unique environmental characteristics, leading to significant differences in the corrosion rate of steels, as well as the composition and structure of rust scales. In this paper, the corrosion behavior of S420 steel, exposed in four different marine zones, i.e. atmospheric, splash, tidal, and immersion zones in the sea area of Qingdao by 36° 06' N and 120° 25' E for one year, was assessed by means of mass loss measurement, macroscopic and microscopic morphology observation, three-dimensional morphology detection, and corrosion product analysis. The results show that S420 steel exhibits the highest corrosion rate in the tidal zone and the lowest corrosion rate in marine atmosphere. Which may be attributed to the water-holding ability of the rust scale, thus providing sufficient electrolyte for the cathodic reaction. On the other hand, in the tidal zone, the wet-dry cycle results in the increase of the Cl- concentration, accelerating the anodic reaction. The formed corrosion products are mainly composed of γ-Fe2O3, Fe3O4 and α/γ-FeOOH. The persistent presence of the electrolyte film may facilitate the formation of γ-FeOOH, making it dominant in the rust scales formed in tidal zone and full immersion zone. In the splash zone, the production of Fe3O4 may be promoted due to the synergist of adequate oxygen supply and wet-dry cycle, thus Fe3O4 is dominant in the formed rust scale. In the marine atmosphere, the thickness of the formed rust scale is the smallest, and the value of α/γ* is the largest, which has protective effect against further corrosion of the steel substrate to certain extent. In the tidal zone, the thickness of the formed rust scale is the highest and the value of α/γ* is the lowest, which is loose and porous, and the number and width of cracks within the rust scale are larger and wider, resulting in worst protective effect for the substrate. In other words, the S420 steel exhibits obvious localized corrosion characteristics with the maximum depth and high volume of pits in the tidal zone.
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Received: 09 June 2023
32134.14.1005.4537.2023.192
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| Fund: 2021 Taishan Industry Leading Talents Project and Key Research and Development Program of Shandong Province(2020CXGC010305) |
Corresponding Authors:
TIAN Huiyun, E-mail: tianhuiyun@ouc.edu.cn
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