Wang Yanli, Zhang Shenghua, Lu Zhaoxia, Wang Ping, Ji Xiaohong, Li Weihua
School of Chemistry and Chemical Engineering, Guangxi University Nanning 530004 P. R. China
School of Resources, Environment and Materials, Guangxi University Nanning 530004 P. R. China.
RSC Adv. 2018 May 25;8(35):19426-19431. doi: 10.1039/c8ra02161a.
A bilayer coating composed of an inner layer of Nb-doped TiO obtained by the sol-gel method and an external polyaniline layer with small SO groups obtained by galvanostatic deposition was prepared to protect 316L stainless steel bipolar plates of proton-exchange membrane fuel cells. The corrosion resistances of bare 316L and 316L with single polyaniline coating and Nb-doped TiO/polyaniline bilayer coating were investigated. The experimental results indicated that both single and bilayer coatings increased the corrosion potential and decreased the corrosion current density compared with bare 316L stainless steel. A thirty-day exposure experiment indicated that the Nb-doped TiO/polyaniline bilayer showed high stability, and it protected 316L more effectively from the penetration of the corrosive ions.
通过溶胶 - 凝胶法制备的掺铌二氧化钛内层和通过恒电流沉积法制备的带有小SO基团的外部聚苯胺层组成的双层涂层，用于保护质子交换膜燃料电池的316L不锈钢双极板。研究了裸露的316L以及带有单一聚苯胺涂层和掺铌二氧化钛/聚苯胺双层涂层的316L的耐腐蚀性。实验结果表明，与裸露的316L不锈钢相比，单一涂层和双层涂层均提高了腐蚀电位并降低了腐蚀电流密度。为期30天的暴露实验表明，掺铌二氧化钛/聚苯胺双层涂层具有高稳定性，并且能更有效地保护316L免受腐蚀性离子的渗透。
