|
| Corrosion Mechanism of A517 Marine Steel in Simulated Marine Immersion Zone |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.01.010 |
| KeyWord::The Initiation of Pitting Corrosion on Austenitic Stainless Steel:On the Role and Importance of Sulfide Inclusions[J]. ChemInform, 2010, 23(15):457-463. |
| Author | Institution |
| FANG Zhi-gang |
Unit 92228, People's Liberation Army, Beijing , China |
| CAO Jing-yi |
Unit 92228, People's Liberation Army, Beijing , China |
| YIN Wen-chang |
Unit 92228, People's Liberation Army, Beijing , China |
| GAO A-wang |
Unit 92228, People's Liberation Army, Beijing , China |
| HAN Zhuo |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| MENG Fan-di |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| LIU Li |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| WANG Fu-hui |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to study the corrosion mechanism of A517 marine steel in marine immersion zone. The corrosion environment in the marine immersion zone was simulated. The corrosion behavior of A517 steel was analyzed by weight loss method, SEM, EDS, XRD and electrochemical techniques. Its corrosion mechanism in the full immersion zone was also discussed. The results showed that the maximum potential difference of A517 steel in the thickness direction was 13 mV, which was less than the minimum potential difference of 50 mV in galvanic corrosion, indicating that the corrosion sensitivity of the material in the thickness direction was consistent. With the prolonged immersion time, the corrosion weight loss gradually increased, and the average corrosion rate decreased first and then increased and finally stabilized. The corrosion rate was about 0.127 mm/a. The initial stage of corrosion power is mainly controlled by the ultimate diffusion of dissolved oxygen, and later is the redox charge transfer control of corrosion products. Corrosion firstly propagates in the inclusions such as Al2O3 and MgO, and the corrosion products show obvious delamination. The outer rust layer is mainly γ-FeOOH which is loose and easy to fall off. The inner rust layer mainly is dense and uniform Fe3O4 β-FeOOH and α-FeOOH are also detected in the rust layer. The presence of a large number of microcracks in the rust layer weakens the protective effect of the product film and promotes the corrosion. |
| Close |
|
|
|