| Summary: | 碩士 === 國防大學理工學院 === 應用化學碩士班 === 97 === The traditional Bipolar plates (BPPs) have some disadvantages such as expensive, weight heavy, and volume massive, which bulky or heavy and carry inconvenience in the cell application. Nowadays, Bipolar plates demanded to have lightweight, and inexpensive cost characteristics.
Because of the advantage of good malleability, lightweight, high mechanical strength, and low cost. The Al alloy is considered a material to replace the traditional BPPs.
In this study, a trivalent chromium layer was deposited on 5052 Al alloy by using conversion treatment to improve the corrosion resistance of the bipolar plates. It is excellent in easy operation, simple manufacturing and low cost by using trivalent chromium conversion treatment.
The results of XPS and TEM measurements showed that the chemical compositions of the coating were mainly Cr, Al, and Zr oxides with a nano structure. From the linear polarization and SEM experiments, the coating formed at 5min conversion treatment showed excellent anticorrosive performance in the simulate PEMFC environment(0.5M H2SO4, 80℃), and the fuel cell environment(80℃, aerate, 0.6V) either. The contact resistance of the coating tended to decrease as a result of increasingly additional pressure. Up to 140N/cm2, the contact resistance of the coating is coherent with the substrate.
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