Surface modifications of aluminum alloy 5052 for bipolar plates using an electroless deposition process
Surface modifications of aluminum alloy 5052 for bipolar plates using an electroless deposition process
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DOI：
10.1016/j.jpowsour.2008.04.082
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发表时间：
2008-08
影响因子：
9.2
通讯作者：
C. Bai;Y. Chou;C. Chao;Shuo-Jen Lee;M. Ger
中科院分区：
文献类型：
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作者：
C. Bai;Y. Chou;C. Chao;Shuo-Jen Lee;M. Ger
本研究尝试用表面改性铝合金 5052 代替燃料电池中的石墨双极板。为了改善铝合金的表面特性，通过化学沉积工艺在不同 pH 值和钼酸钠 (Na2MoO4) 浓度下在基材上沉积 Ni-Mo-P 涂层。研究了控制条件对这些沉积物的微观结构和耐腐蚀性的影响。此外，将Ni-Mo-P涂层的热稳定性和耐腐蚀性与各种攻击环境下的Ni-P沉积物进行了比较。实验结果表明，本实验生产的所有沉积物的电导率均优于美国能源部的目标。最佳的Ni-Mo-P涂层是在pH 7.0和70°C下含有4.13×10−2M Na2MoO4的溶液中生成的，在混合酸性环境中具有优异的耐腐蚀性。研究还发现，Ni-Mo-P 镀层比 Ni-P 镀层表现出更好的热稳定性和优异的长期耐腐蚀性。因此，Ni-Mo-P沉积物在保护双极板涂层方面具有广阔的应用前景。
This study tries to replace graphite bipolar plates in fuel cells with surface-modified aluminum alloy 5052. To improve the surface characteristics of Al alloy, Ni–Mo–P coatings were deposited on the substrates under various pH values and concentrations of sodium molybdate (Na2MoO4) by an electroless deposition process. The effects of the controlling conditions on the microstructure and the corrosion resistance of these deposits were examined. Moreover, the thermal stability and the corrosion resistance of Ni–Mo–P coatings were compared with those of Ni–P deposits in various attacking environments. The experimental results indicate that the electrical conductivity of all deposits produced in this experiment is superior to the U.S. DOE's target. The optimum Ni–Mo–P coating, which is produced in a solution containing 4.13×10−2M Na2MoO4at pH 7.0 and 70°C, possesses superior corrosion resistance in a mixed acidic environment. It is also found that Ni–Mo–P coatings exhibit better thermal stability, and superior long-term corrosion resistance than Ni–P deposits. The Ni–Mo–P deposits, therefore, are promising for applications in protecting coatings for bipolar plates.