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oai:docta.ucm.es:20.500.14352/68792024-10-03T15:41:30Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Lu, Xiaopeng author Ma, Jirui author Mohedano Sánchez, Marta author Pillado Ríos, Borja author Arrabal Durán, Raúl author Qian, Kun author Li, Yan author Zhang, Tao author Wang, Fuhui author 2021-04-22 Plasma electrolytic oxidation (PEO) coatings on AZ91 Mg alloy were sealed in calcium nitrate solutions at different pH values (3, 4 and 5). Sodium dodecyl sulfate (SDS) was added to study the effect of SDS on the corrosion resistance of the sealed coatings. The microstructure, chemical composition and corrosion resistance of the coatings were investigated by means of SEM, XPS, XRD and electrochemical corrosion tests. The corrosion performance of the coatings was improved due to precipitation of Ca-containing precipitate. Low pH and SDS addition enhanced hydroxyapatite precipitation and produced hydrophobic coatings with worse paint adhesion but better corrosion resistance. 0257-8972 10.1016/j.surfcoat.2021.127220 https://hdl.handle.net/20.500.14352/6879 https://doi.org/10.1016/j.surfcoat.2021.127220 https://www.sciencedirect.com/science/article/pii/S0257897221003947 Ca-based sealing of plasma electrolytic oxidation coatings on AZ91 Mg alloy