Publications

Data publikacji: 2024-01-25

Deposition and corrosion performance of phosphate-polylactic acid composite coatings on WE43 magnesium alloy

A.V. Paspelau, A.A. Kasach, Jacek Gurgul, Grzegorz Mordarski, Konrad Skowron, I.I. Kurilo, Dzmitry S. Kharytonau

Surface and Coatings Technology 478 (2024-01-25) 130419
https://doi.org/10.1016/j.surfcoat.2024.130419
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Abstrakt

The degradation profile of Mg alloys in biomedical environments can be controlled by applying various types of surface coatings. Phosphate chemical conversion coatings (CaP) and polylactic acid (PLA) biopolymer coatings are biocompatible and promising for the corrosion protection of Mg alloys. The aim of this work was to investigate the physicochemical properties and corrosion performance of inorganic, organic, and mixed inorganic-organic coatings. Three types of surface modification, CaP, PLA, and a combined CaP-PLA coating were obtained on the surface of the magnesium alloy WE43. Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and infrared spectroscopy were employed to characterize the surface and interfacial morphology, along with the composition of the coatings before and after corrosion experiments. The protective performance of obtained coatings was examined by electrochemical impedance spectroscopy and immersion testing in Hank's solution. Coated samples showed significantly improved corrosion resistance. The values of polarization resistance based on impedance measurements were 164; 8688; 69,410; and 228,369 Ω cm2 for WE43 alloy, CaP, PLA, and CaP-PLA coatings, respectively. The results allowed to propose the mechanism of the coatings growth and their further corrosion degradation. A two-component CaP-PLA coating provided reliable corrosion resistance in Hank's solution for 14 days.

Lista publikacji

Lista publikacji

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