摘要
在不锈钢表面制备一层导电性好、耐腐蚀的薄膜,是获得高性能质子交换膜燃料电池双极板材料的有效方法。实验分别采用抛光、喷砂和拉砂三种方法对不锈钢基体进行了前处理,然后利用物理气相沉积技术在不锈钢表面制备了TiN膜。观察了双极板材料的微观结构,并对其导电性和耐蚀性进行评价,以研究基体前处理对性能的影响。经过不同的前处理,双极板材料表面呈现出完全不同的微观结构。双极板材料的界面导电性与有效接触面积密切相关。当与碳纸接触时,抛光前处理的双极板材料导电性最好;当与膨胀石墨接触时,喷砂前处理的双极板材料电阻最低。在模拟电池腐蚀环境下0.5mol/LH2SO4+2×10-6F-的电化学腐蚀结果显示,喷砂前处理的双极板材料具有最好的耐腐蚀能力。
Forming a protecting film with low interfacial contact resistance and good corrosion resistance on stainless steel is one of the possible solutions to get high performance bipolar plate for proton exchange membrane fuel cell （PEMFC）. TiN was coated on 316L stainless steel by PVD as bipolar plate, and effects of the base metal pretreatment were studied. Three kinds of pretreatment method were applied： polishing, sandblasting and light ream. Microstructure, contact resistance and corrosion behaviors of the samples were investigated. Different microstructures were obtained by different pretreatments. The contact resistance is greatly related to the effective contact area. When contacted with carbon paper, the sample with polished base metal exhibited the best conductivity; when contacted with flexible graphite, the sample with sandblasting pretreatment showed lowest contact resistance. Corrosion behaviors of the samples were studied in 0.5 mol/L H2SO4＋2 × 10^-6 F-and the sample pretreated by sandblasting showed the best corrosion resistance.
出处
《电源技术》
CAS
CSCD
北大核心
2008年第10期669-672,共4页
Chinese Journal of Power Sources
基金
国家“863”项目“模压薄型燃料电池双极板制备技术”课题(No.2006AA11A134)资助
关键词
质子交换膜燃料电池
金属双极板
前处理
抛光
喷砂
拉砂
proton exchange membrane fuel cell （PEMFC）
metal bipolar plate
pretreatment
polishing
sandblasting
light ream
