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Composite coatings using plasma electrolytic oxidation and sodium fumarate reduce corrosion by 0.12 mm/year, suggesting effective biodegradation for implants.
This study presents a method for fabricating composite protective coatings on the MA8 magnesium alloy, combining plasma electrolytic oxidation (PEO), impregnation of the protective layer with sodium fumarate (used as an environmentally friendly corrosion inhibitor), and polycaprolactone treatment for controlled active agent release. The sample with the composite coating exhibits a low corrosion rate of 0,12 mm/year and maintains stable anticorrosion properties for 7 days. The active corrosion protection mechanism involves three stages: inhibitor release from the PEO layer pores, migration to damaged surface areas, and the adsorption on metallic magnesium or magnesium corrosion products. The polymer layer extends the duration of the inhibitor protective effect. The proposed method enables controlled biodegradation of magnesium alloys, making them promising candidates for implant materials.
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A. S. Gnedenkov (2025) studied this question.
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