Laser Cladding Process of Flow Channel in 316L Stainless SteelBipolar Plate for Fuel Cells
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摘要: 通过激光熔覆成形工艺制备了316L不锈钢燃料电池双极板流道，根据双极板流道结构要求，建立了熔覆道成形量化评分标准，通过正交试验研究了激光功率、扫描速度、铺粉厚度对熔覆道成形性能和耐腐蚀性能的影响。结果表明：铺粉厚度、激光功率、扫描速度对熔覆道成形影响的显著性依次减小；较低的激光功率、较高的扫描速度、较小的铺粉厚度以及较低的热输入，有利于获得成形更好的熔覆道；激光功率和扫描速度的增加均有利于提高熔覆道的耐点蚀性能；熔覆道成形效果越好，耐点蚀性能越好。Abstract: The 316L stainless steel bipolar plate for fuel cells was prepared by laser cladding forming process. According to the requirements of bipolar plate channel structure, the quantitative scoring standard of cladding channel was established. The effects of laser power, scanning speed and powder thickness on formability and corrosion resistance of the cladding channel were studied by orthogonal experiment. The results show that the effect of spreading powder thickness, laser power, and scanning speed on the formation of cladding channels decreased in order. The relatively low laser power, high scanning speed, small spreading thickness and low heat input were conducive to obtaining a cladding channel with better formability. Increasing laser power and scanning speed were both beneficial to improve the pitting corrosion resistance of the cladding channel. The better the formability of the cladding channel, the better the pitting corrosion resistance.
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Keywords:
- fuel cell /
- bipolar plate /
- laser cladding /
- corrosion resistance
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