Besides their noteworthy tribological and corrosion protection properties, Plasma Electrolytic Oxidation (PEO) coatings feature a porous microstructure that is able to host corrosion inhibitors. This study reveals that although 2,5pyridindicarboxylate (2,5PDC) shows a remarkable corrosion inhibition effect for bare AZ21 Mg alloy, it can extensively deteriorate a PEO coating on the same Mg substrate, resulting in an overall accelerated failure of the PEO-coated AZ21 alloy. The deteriorative behavior of 2,5PDC towards PEO-coated AZ21 is explained based on the characterization of the bare and PEO-coated AZ21 exposed to the NaCl electrolyte with and without inhibitor using EIS, SEM, STEM and ToF-SIMS.

除了显着的摩擦学和腐蚀防护性能外，等离子电解氧化 (PEO) 涂层还具有多孔微观结构，能够容纳腐蚀抑制剂。该研究表明，尽管 2,5 吡啶二羧酸盐 (2,5PDC) 对裸露的 AZ21 镁合金显示出显着的缓蚀效果，但它可以使同一镁基体上的 PEO 涂层广泛劣化，导致 PEO 涂层的 AZ21 整体加速失效合金。2,5PDC 对 PEO 涂层 AZ21 的劣化行为基于暴露于 NaCl 电解质的裸露和 PEO 涂层 AZ21 使用 EIS、SEM、STEM 和 ToF-SIMS 的表征来解释。