|
| Flow Accelerated Corrosion Behavior of EH32 Steel in Artificial Seawater |
| Received:January 15, 2024 Revised:February 26, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.03.009 |
| KeyWord:EH32 steel artificial seawater flow accelerated corrosion rust layer flow field mass transfer synergistic effect |
| Author | Institution |
| JIANG Wanheng |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Liaoning Dalian , China |
| JIA Huifeng |
Offshore Oil Engineering Co., Ltd., Tianjin , China |
| SHU Wei |
Offshore Oil Engineering Co., Ltd., Tianjin , China |
| ZHANG Jian |
Offshore Oil Engineering Co., Ltd., Tianjin , China |
| ZHANG Qiliang |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Liaoning Dalian , China |
| YANG Hongqi |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Liaoning Dalian , China |
| XU Yunze |
School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Liaoning Dalian , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to clarify the synergistic mechanism of flow field, mass transfer and rust layer in the flow accelerated corrosion process of EH32 steel. The flow accelerated corrosion behavior of EH32 steel was studied by the jet injection system, and the flow field distribution was simulated based on CFD simulation. Finally, the corrosion morphology of EH32 steel was analyzed by microscopic morphology characterization. The result showed that in the jet injection system, the flow field distribution on the surface of the sample was uneven and could be divided into different areas according to the color of the rust layer. In the area facing the nozzle, the rust layer was the thickest but loose and porous, and the corrosion was the most serious and pits were formed. In the area away from the nozzle, the rust layer was gradually thinner but denser, and the corrosion morphology was transformed into "flow mark" and pitting. The conclusion is that the flow field seriously affects the distribution of corrosion products. The rust layer formed in the region with high normal stress and low shear stress is thick and loose, and the rust layer formed in the region with low normal stress and high shear stress is thinner but denser. The transfer process of the anodic solution generated by the reaction with the fluid leads to the formation of the "flow mark" damage morphology, and the dense rust layer inhibits the transfer of the anodic solution, resulting in the damage morphology of pitting pits. The accumulation of the rust layer and anodic liquid makes the central area of the nozzle appear as the main anode area, and the corrosion damage is the most serious, while the area away from the center has a low corrosion rate because the dense corrosion products inhibit the mass transfer process. The synergistic action of flow field, rust layer and mass transfer determines the flow accelerated corrosion behavior. |
| Close |
|
|
|