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| Pitting Corrosion Characteristics of Monel K-500 Alloy in the Artificial Seawater |
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| DOI：10.7643/issn.1672-9242.2022.06.000 |
| KeyWord:Monel K- 500 alloy pitting corrosion SVET SKP self-repair TiC |
| Author | Institution |
| QIN Ming-hua |
Institute for Special Steels, Central Iron and Steel Research Institute, Beijing , China |
| ZHENG Wen-jie |
Institute for Special Steels, Central Iron and Steel Research Institute, Beijing , China |
| WANG Juan |
Wuhan Second Ship Design and Research Institute, Wuhan , China |
| ZHU Yu-liang |
Institute for Special Steels, Central Iron and Steel Research Institute, Beijing , China |
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| Abstract: |
| Research on pitting corrosion characteristics of marine materials have been conducted wildly, however, Monel K-500 alloy, as one of the most important marine corrosion resistant alloys, there is a little research on its pitting characteristics. In order to research the pitting characteristics of Monel K-500 alloy in the seawater, the initiation and growth process of pitting corrosion was studied by scanning vibrating electrode technique (SVET) under constant current mode, and morphology of pitting area was characterized by scanning electron microscopy (SEM). SVET results showed that the anodic potential was transferred from the pitting center to the boundary area, and the smaller anode area with more positive potential could be absorbed by larger negative anode area. The SEM results showed that the accumulation of corrosion product on TiC surface, the dissolution of matrix around TiC and the shedding of TiC will appear near the pitting corrosion area. SVET results indicated that passive film of Monel K-500 alloy was with good ability to self-repair, leading to slow expansion of pitting depth. Besides, the growth of Monel K-500 alloy could be in the way to annex and penetrate each other. The SEM results suggested that the pitting corrosion of Monel K-500 alloy was mainly induced by the precipitation of TiC, so the performance of pitting corrosion resistance of Monel K-500 alloy could be optimized by controlling the amount and distribution of TiC on the aspect of composition and process. |
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