Kim Yu-Sung, Lee In-Sik, Choi Jin-Young, Jun Shinhee, Kim Daeil, Cha Byung-Chul, Kim Dae-Wook
Advanced Manufacturing Process R&D Group, Ulsan Regional Division, Korea Institute of Industrial Technology (KITECH), 55 Jongga-ro, Jung-gu, Ulsan 44313, Korea.
Total Marine Engineering Co., Ltd., 6 Goneul-ro, Dong-gu, Ulsan 44056, Korea.
Materials (Basel). 2021 Aug 31;14(17):4972. doi: 10.3390/ma14174972.
Niobium was coated on 316L stainless steel by pulsed direct-current (DC) magnetron sputtering to improve corrosion behavior. The applied bias voltage highly affected the microstructure and crystallographic features, which lead to improved corrosion behavior. Due to the increased bias voltage, the microstructure of the niobium coating layer presented a smaller crystallite size and a densified structure, which obviously reduced the number of pinholes in the coated layer. Additionally, an increase in the degree of orientation toward the (110) plane, the most densely packed plane, lead to reduced dissolution of metal ions. Therefore, a pure niobium coating layer effectively protected the metal bipolar plate from a highly corrosive environment of polymer electrolyte membrane fuel cell (PEMFC) stacks. In particular, higher bias voltages of 600 and 800 V induced improved corrosion resistance, which satisfied the demand for the bipolar plate.
通过脉冲直流磁控溅射在316L不锈钢上涂覆铌，以改善其腐蚀性能。施加的偏置电压对微观结构和晶体学特征有很大影响，从而改善了腐蚀性能。由于偏置电压的增加，铌涂层的微观结构呈现出更小的晶粒尺寸和致密化结构，这明显减少了涂层中的针孔数量。此外，朝着最密集堆积的(110)平面的取向程度增加，导致金属离子的溶解减少。因此，纯铌涂层有效地保护了金属双极板免受聚合物电解质膜燃料电池(PEMFC)堆的高腐蚀性环境的侵蚀。特别是，600和800 V的较高偏置电压提高了耐腐蚀性，满足了双极板的要求。
