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| Study of 40Cr Low Alloy Steel Corrosion Behaviour in Different Sea Area |
| Received:March 13, 2021 Revised:May 14, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.11.016 |
| KeyWord:40Cr steel seawater corrosion |
| Author | Institution |
| ZHANG Peng-hui |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Qingdao , China |
| ZHAO Jian-cang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Qingdao , China |
| DING Kang-kang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Qingdao , China |
| CHENG Wen-hua |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Qingdao , China |
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| Abstract: |
| The paper aims to study natural corrosion behavior of 40Cr in seawater. The corrosion behavior of 40Cr steel at full-immersion zone in Qingdao, Zhoushan and Sanya sea area was studied by means of morphology, corrosion weight loss and XRD analysis. The results showed that 40Cr steel corroded seriously in different seawater. Samples were covered with huge amount of marine organism in Qingdao and Sanya sea area, and silt in Zhoushan sea area as while. Pitting was the main corrosion morphology after removing the corrosion products. During test period, corrosion rates decreased as time prolonged, and samples in Sanya sea area corroded fastest under the same test period. In contrast with Q235 under same test condition, corrosion rates of 40Cr were higher. Pitting depth increased as time prolonged in Qingdao and Zhoushan sea area, while increasing first then decreasing in Sanya sea area, and samples in Qingdao sea area got the most shallow pitting depth under the same test period. Corrosion products were composed of α-FeOOH and Fe2O3, which were in steady state, regardless of test sea area or period. Pitting corrosion is the mainly corrosion morphology in the three sea areas. During test period, the corrosion rate of the samples in the three sea areas gradually decreases as time prolonged, and the corrosion of the samples in Sanya sea area is the most serious under same test condition. The content of C in 40Cr steel is higher, and its corrosion rate is higher than that of ordinary carbon steel under the same conditions. The corrosion products of 40Cr steel are mainly steady-state components, probably because of chromium addition, which catalyzed corrosion products converting to thermodynamic steady state. |
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