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| Corrosion Behavior of E420 in Seawater Environments of the Reef in the South China Sea |
| Received:April 07, 2020 Revised:April 17, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.10.001 |
| KeyWord:steel reefs in the South China Sea seawter environmets corrosion |
| Author | Institution |
| DING Kang-kang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| LIU Ya-qiang |
Beijing Huanjia Communication Technology Co., Ltd, Beijing , China |
| GU Liang-hua |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| GUO Wei-min |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| HOU Jian |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| SUN Ming-xian |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
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| Abstract: |
| The work aims to investigate the corrosion behavior and rules of E420 low alloy steel in seawater environments of the reef in the South China Sea. Field exposure test was carried out on E420 steel in the splash, tidal and immersion zones of South China Sea for 0.5 a, 1 a, 1.5 a and 2 a to study its corrosion morphology and law of dynamics and establish a grey prediction model GM(1,1) about corrosion rates. With the extension of the exposure period, the corrosion rate of E420 in different seawater zones of the reef in South China Sea decreased, while the pitting depth reached a higher level as a whole. The corrosion rates of E420 in the splash zone were the largest, far greater than that in the general sea areas, followed by the tidal zone, and the full immersion zone was the minimum. The relative error between the predicted corrosion rate based on GM(1,1) model and the measured corrosion rate was less than 25%.The environment in different seawater zones of the reef in South China Sea has severe corrosion property, especially in the splash zone, where formed anti-rust layers have limited protective effect. Corrosion tends to develop unevenly with time, and the grey model GM(1,1) can be used to predict the seawater corrosion of different zones in the South China Sea reef. |
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