磁控溅射NiCrCN涂层在质子交换膜燃料电池阴极环境中的腐蚀行为
Corrosion Behaviors of Magnetron Sputtered NiCrCN Coating in Proton Exchange Membrane Fuel Cell Cathode Environment
董延 1陶毅 2张金洲2
作者信息
- 1. 河南职业技术学院智能制造学院,郑州 450046
- 2. 浙江工业大学材料科学与工程学院,杭州 310014
- 折叠
摘要
采用非平衡磁控溅射技术在316L不锈钢表面沉积NiCrCN涂层,研究不同铬靶电流(2,4,6 A)下涂层的微观形貌以及在模拟质子交换膜燃料电池(PEMFC)阴极环境(0.5 mol·L-1 H2SO4+2 mg·L-1 HF,空气鼓入,70 ℃)中的耐腐蚀性能.结果表明:制备的NiCrCN涂层均由金属镍、CrN、Cr2N、Cr7C3等相组成;4 A铬靶电流下制备的涂层表面光滑平整且结构致密,而2,6 A铬靶电流下制备的涂层中出现明显的柱状晶结构.在模拟PEMFC阴极环境中恒电位0.6 V极化以及高电位1.0 V循环极化后,随着铬靶电流的增大,涂层的腐蚀电流密度先减小后增大,4 A铬靶电流下制备涂层的腐蚀电流密度最小,恒电位极化曲线更加平稳,恒电位极化时溶解在腐蚀溶液中的金属离子质量浓度最小,表面腐蚀程度最轻;该涂层在静止浸泡14 d后的电荷转移电阻始终比316L不锈钢高1个数量级.在PEMFC正常工作、快速启动/关闭和长期静止条件下服役的最佳NiCrCN涂层为4 A铬靶电流下制备的涂层.
Abstract
Unbalanced magnetron sputtering technology was used to deposit NiCrCN coating on 316L stainless steel surface.The micromorphology and corrosion resistance in the simulated cathode environment of a proton exchange membrane fuel cell(PEMFC)(0.5 mol·L-1 H2SO4+2 mg·L-1 HF,air injection,70 ℃)of the coating prepared at different Cr target currents were studied.The results show that the prepared NiCrCN coatings were composed of metal nickel,CrN,Cr2 N,Cr7 C3 phases.The surface of the coating prepared at 4 A Cr target current was smooth and compact,while the columnar crystal structure of the coatings prepared at 2,6 A Cr target currents was obvious.After polarization at constant potential of 0.6 V and cyclic polarization at high potential of 1.0 V in the simulated cathode environment of PEMFC,the corrosion current density of the coating first decreased and then increased with the increase of Cr target current.The corrosion current density of the coating prepared at 4 A Cr target current was the smallest,and the constant potential polarization curve was more stable;the mass concentration of metal ions dissolved in corrosion solution in constant potential polarization was the smallest,and the surface corrosion degree was the lightest.The charge transfer resistance of the coating prepared at 4 A Cr target current after immersion for 14 d was 1 order of magnitude higher than that of 316L stainless steel.The best NiCrCN coating for PEMFC service under normal operation,quick start-up/shut-down and long-term rest conditions was the coating prepared at 4 A Cr target current.
关键词
质子交换膜燃料电池/NiCrCN涂层/磁控溅射/耐腐蚀性能Key words
proton exchange membrane fuel cell/NiCrCN coating/magnetron sputtering/corrosion resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据