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| Initial Corrosion Behaviors of Ship Steel Plate in Fresh Water Environment |
| Received:May 27, 2017 Revised:September 15, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2017.09.015 |
| KeyWord:ship plate freshwater environment corrosion |
| Author | Institution |
| HAO Zhang-ke |
1.Wuhan Research Institute of Materials Protection, Wuhan , China;2.State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan , China |
| CHEN Zhi-biao |
Wuhan Institute of Specification of China classification society, Wuhan , China |
| ZHANG Dong |
1.Wuhan Research Institute of Materials Protection, Wuhan , China;2.State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan , China |
| PAN Ying |
1.Wuhan Research Institute of Materials Protection, Wuhan , China;2.State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan , China |
| ZHOU Xue-jie |
1.Wuhan Research Institute of Materials Protection, Wuhan , China;2.State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan , China |
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| Abstract: |
| Objective To study initial corrosion behaviors of ship steel plate material in fresh water environment of the Yangtze River. Methods Several methods including morphology analysis, weight loss analysis, XRD, open circuit potential and polarization curves were used to study corrosion behaviors of Q235B and CCSA in different exposure modes (surface water, semi immersion, full immersion) and different soaking time (0.5a, 1a) in outdoor fresh water environment of the Yangtze River; corrosion behaviors in different exposure conditions (semi immersion and full immersion) in indoor fresh water environment of the Yangtze River in 768h; electrochemical corrosion behaviors of indoor fresh water environment at different times (0-14 d). Results Two kinds of ship steel plate materials suffered from serious corrosions in the Wuhan Section of the Yangtze River. The corrosion rate in the semi immersion environment was the largest, which was up to100 μm/a; the corrosion rate in the water surface area was the smallest, which was about 30 μm/a and the whole immersion zone was about 80 μm/a; the corrosion resistance of CCSA was better than that of Q235B and the corrosion rate was similar between 1 and 0.5 years. The corrosion potential of two kinds of marine steel plates in the fresh water immersion environment of Yangtze River decreased with time, and tended to be stable 2 days later. The corrosion rate in the semi immersion environment was greater than that of the full immersion zone. The polarization curves showed that after 2 days of immersion, the corrosion rate decreased and tended to be stable. Conclusion The corrosion resistance of CCSA is better than that of Q235B.The corrosion is the most serious in the semi immersion environment, followed by the total immersion zone, and the minimum environmental corrosion in the water surface. |
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