Kang Sin-Jae, Kim Geon-Il, Kim Seung-Hyun, Lee Ji-Han, Kim Jeong-Soo, Im Seong-Un, Kim Yeon-Soo, Kim Jung-Gu
School of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Chunchun-Dong, Jangan-Gu, Suwon-si, Gyeonggi-do, 16419, South Korea.
Water Electrolyzer Engineering Design Team, R&D Division, Hyundai Motor Company,17-5, Mabuk-ro 240 beongil, Giheung-gu, Yongin-si, Gyeonggi-do, 16891, South Korea.
Heliyon. 2024 Jul 14;10(14):e34551. doi: 10.1016/j.heliyon.2024.e34551. eCollection 2024 Jul 30.
In this study, the corrosion behavior and degradation mechanism of Ti-Pt-coated stainless steel bipolar plates were investigated through electrochemical tests and surface analysis in a polymer electrolyte membrane water electrolysis (PEMWE) operating environment. The coated bipolar plate has a corrosion current density of only 1.68 × 10 A/cm, which is an order of magnitude lower than that of the bare SS316L substrate (1.94 × 10 A/cm), indicating that its corrosion resistance is superior to that of bare SS316L substrate. However, in the PEMWE operating environment, the protection efficiency of the coating and the corrosion resistance of the coated bipolar plate decreased. The degradation of the coated bipolar plate can be attributed to electrolyte penetration into the blistering areas of the coating layer with micro voids. Defects in the coating layer occur because of the pressure of oxygen gas generated within the coating layer under high-potential conditions, thereby exposing the substrate to the electrolyte and corrosion.
在本研究中，通过在聚合物电解质膜水电解（PEMWE）运行环境中的电化学测试和表面分析，研究了镀钛-铂不锈钢双极板的腐蚀行为和降解机制。涂覆的双极板的腐蚀电流密度仅为1.68×10 A/cm，比裸露的SS316L基底（1.94×10 A/cm）低一个数量级，表明其耐腐蚀性优于裸露的SS316L基底。然而，在PEMWE运行环境中，涂层的保护效率和涂覆双极板的耐腐蚀性下降。涂覆双极板的降解可归因于电解质渗透到具有微孔的涂层起泡区域。涂层中的缺陷是由于在高电位条件下涂层内产生的氧气压力而产生的，从而使基底暴露于电解质并发生腐蚀。
