Gnedenkov Andrey S, Sinebryukhov Sergey L, Filonina Valeriia S, Ustinov Alexander Yu, Sukhoverkhov Sviatoslav V, Gnedenkov Sergey V
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia.
Polymers (Basel). 2022 Dec 31;15(1):202. doi: 10.3390/polym15010202.
The method of hybrid coating formation on the surface of a bioresorbable wrought magnesium alloy and magnesium obtained by additive technology was proposed. Plasma electrolytic oxidation (PEO) with subsequent treatment of the material using an organic biocompatible corrosion inhibitor and a bioresorbable polymer material was used to obtain the protective layers. The optimal method of surface treatment was suggested. Using SEM/EDX analysis, XRD, XPS, and confocal Raman microspectroscopy, the composition of the formed surface layers was determined. The corrosion protection performance of the formed coatings was studied by potentiodynamic polarization and electrochemical impedance spectroscopy techniques in 0.9 wt.% NaCl and HBSS. Hydrogen evolution and mass loss tests were performed to study the corrosion rate of samples with different types of protective coatings. Sealing the pores of PEO coating with a polymeric material contributes to a significant reduction in the amount of the inhibitor diffusing into a corrosive medium. The best barrier properties were established for the hybrid coating formed with a one-stage application of benzotriazole and polycaprolactone. Such layers reduce the rate of alloy degradation due to active protection.
提出了一种在生物可吸收变形镁合金和通过增材制造技术获得的镁表面形成混合涂层的方法。采用等离子体电解氧化（PEO），随后使用有机生物相容性腐蚀抑制剂和生物可吸收聚合物材料对材料进行处理，以获得保护层。提出了最佳的表面处理方法。通过扫描电子显微镜/能谱分析（SEM/EDX）、X射线衍射（XRD）、X射线光电子能谱（XPS）和共焦拉曼显微光谱法确定了形成的表面层的成分。通过动电位极化和电化学阻抗谱技术在0.9 wt.% NaCl和汉克斯平衡盐溶液（HBSS）中研究了形成涂层 的耐腐蚀性能。进行析氢和质量损失测试以研究不同类型保护涂层样品的腐蚀速率。用聚合物材料密封PEO涂层的孔隙有助于显著减少扩散到腐蚀介质中的抑制剂的量。对于通过一步法应用苯并三唑和聚己内酯形成的混合涂层，确定了最佳的阻隔性能。由于主动保护，此类涂层降低了合金的降解速率。
