燃料电池不锈钢双极板CrN/CrC薄膜表面改性研究

Research on CrN/CrC film surface modification of stainless steel bipolar plates for fuel cells

采用离子镀技术在质子交换膜燃料电池不锈钢双极板表面制备了CrN/CrC多层薄膜。测试结果表明,与未镀膜的不锈钢基体相比,镀膜不锈钢的接触电阻（120N/cm2压紧力）降低2个数量级,并且耐蚀性能显著改善,腐蚀电流密度降低0.5~1个数量级。同时,镀膜不锈钢的耐久性亦大幅提升,改性薄膜可以有效保护不锈钢基体免受腐蚀损害。

The CrN/CrC multilayer film was prepared on stainless steel bipolar plate surface of proton exchange membrane fuel cell （PEMFC） by arc ion plating （ALP）. The measurement results show that compared with the uncoated stainless steel substrate, the interfacial contact resistance of the coated sample greatly decreases by 2 orders of magnitude （at 120 N/cm^2 compaction force）. The corrosion resistance of the coated sample is remarkably improved. The corrosive current density decreases by 0.5-1 order of magnitude. Moreover, there is a significant improvement in the durability of the coated sample. The modified film can effectively protect the stainless steel substrate from corrosion.