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| Corrosion Behavior of New High Strength Stainless Steel in Seawater |
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| DOI：10.7643/issn.1672-9242.2022.07.012 |
| KeyWord:high strength stainless steel austenitic stainless steel seawater environment corrosion behavior corrosion resistance passivation film |
| Author | Institution |
| LIANG Ying |
Key Laboratory of Marine Corrosion and Protection, 725th Institute of China Shipbuilding Industry Corporation, Shandong Qingdao , China;China University of Petroleum East China, Shandong Qingdao , China |
| ZHANG Hui-xia |
Key Laboratory of Marine Corrosion and Protection, 725th Institute of China Shipbuilding Industry Corporation, Shandong Qingdao , China |
| HAO Fu-yao |
Key Laboratory of Marine Corrosion and Protection, 725th Institute of China Shipbuilding Industry Corporation, Shandong Qingdao , China |
| LI Xiang-bo |
Key Laboratory of Marine Corrosion and Protection, 725th Institute of China Shipbuilding Industry Corporation, Shandong Qingdao , China |
| HU Peng-fei |
Key Laboratory of Marine Corrosion and Protection, 725th Institute of China Shipbuilding Industry Corporation, Shandong Qingdao , China |
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| Abstract: |
| This paper is intended to study the corrosion resistance and determine the corrosion mechanism of new high strength stainless steel in seawater environment. In this paper, the corrosion resistence of the new high strength stainless steel in seawater environment were investigated by potentiometric polarization curve, electrochemical impedance test and seawater immersion test. The microstructure and passivation film composition of the stainless steel were analyzed by metallographic microscope observation, X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The results show that the self-corrosion potential, pitting potential and protection potential of the new high strength stainless steel in seawater are stable in the range of 0.012~0.02 V, 1.10 V and 0.89 V, respectively. The electrochemical impedance value remained 106 Ω.cm2 after 45 days of immersion in seawater, which indicated that there was no nucleation of pitting corrosion on the surface of the passivation film, and the passivation film still had good protection. This is because the stainless steel has a typical twinning austenite structure, and the main components of the passivation film surface are FeOOH, Cr(OH)3 and other hydroxides, and the inner composition is mainly Fe3O4, Cr2O3, CrO3 and elemental Ni, which has a strong passivation film repair ability, and thus has a good corrosion resistance in seawater. |
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