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| Erosion-corrosion Mechanism of Q235 Steel and High Manganese Steel for Dredging |
| Received:March 11, 2024 Revised:April 21, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.07.017 |
| KeyWord:dredging Q235 steel high manganese steel pure erosion erosion-corrosion synergistic effect |
| Author | Institution |
| CHEN Hao |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian , China |
| LI Dan |
CNOOC Research Institute Co., Ltd., Beijing , China |
| LIU Yongfei |
CNOOC Research Institute Co., Ltd., Beijing , China |
| YAO Haiyuan |
CNOOC Research Institute Co., Ltd., Beijing , China |
| CHEN Jingjie |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian , China |
| XU Yunze |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian , China |
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| Abstract: |
| The work aims to compare the erosion-corrosion behavior of Q235 steel and new high manganese austenitic steel for traditional dredging, and analyze the coupled damage mechanism of erosion-corrosion between the two steels. The pure erosion and erosion-corrosion behavior of Q235 steel and high manganese steel were studied with a jet spraying device. The coupling components of erosion-corrosion were decoupled by electrochemical impedance and weight loss measurement methods. Finally, the mechanism of erosion-corrosion coupling damage was analyzed through morphology characterization. The pure erosion results showed that both Q235 steel and high manganese steel had high losses under high flow velocity gravel impact, and the pure erosion rate of Q235 steel was twice that of high manganese steel. The results of erosion-corrosion showed that the total loss rate of Q235 steel was twice that of high manganese steel, and the erosion played a dominant role in the erosion-corrosion loss of both types of steel. The corrosion enhanced erosion rate of Q235 steel accounted for 25.9% of the total loss rate, which was higher than the proportion of high manganese steel at 18.3%. By comparing and analyzing the macroscopic and microscopic damage morphology of two types of steel, it is found that although the hardness of high manganese steel is much higher than that of Q235 steel, its deformation ability is also high, which makes high manganese steel have better erosion resistance than Q235 steel. In addition, the addition of Cr and Al elements further enhances the corrosion resistance of high manganese steel, ultimately resulting in a much better erosion resistance than Q235 steel. |
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