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| Structure and Performance of Bipolar Plate Flow Channel by Overpotential Polishing Additive Manufacturing |
| Received:September 14, 2023 Revised:January 16, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.03.006 |
| KeyWord:overpotential polishing laser power bed fusion 316L microchannels bipolar plates corrosion resistance |
| Author | Institution |
| JIAN Ran |
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China;Aviation Key Laboratory of Science and Technology on Structural Corrosion Protection and Control, Hubei Jingmen , China |
| DONG Weisong |
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| LIN Kaijie |
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| The work aims to study the effect of overpotential polishing on the formability of the inner wall of stainless steel irregular cross-section microchannels and the performance of bipolar plates. The electrochemical test, scanning electron microscopy (SEM), and roughness test were adopted to analyze the laser power bed fusion (LPBF) shaped microchannels. The effects of polishing time on the surface morphology, typical defects, surface roughness, and corrosion resistance of microchannels were studied. In the first 10 minutes of polishing, the quality of the inner wall of microchannel was effectively improved. With the extension of polishing time, the surface roughness reached a stable value, and the typical defects gradually changed from local defects such as sticky powder and semi molten metal particles to large-scale defects such as spheroidization, slag hanging, and step effect, until pitting. Within 5~15 minutes of polishing, the surface quality of LPBF formed 316L stainless steel was improved. With the extension of polishing time, its corrosion resistance decreased. Adopting an overpotential polishing process and selecting an appropriate overpotential polishing time can effectively improve the forming quality of the inner wall of the microchannel and the corrosion resistance of bipolar plate. |
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