Electrochemical studies demonstrate improved corrosion resistance in magnesium alloys with cerium nitrate coatings, highlighting a promising protective strategy.
The paper presents a method for forming a hybrid protective coating on MA8 alloy formed by plasma electrolytic oxidation (PEO) with subsequent impregnation of the resulting heteroxide layer with cerium compounds and biopolymer treatment. The coating has a developed surface and contains magnesium, oxygen, calcium and phosphorus, which imparts bioactive properties to it. The introduction of cerium nitrate into the coating increases corrosion resistance without damaging the coating structure. Electrochemical studies (PDP and EIS) confirmed a significant improvement in the protective properties of hybrid coatings: the GP-NC01 sample demonstrates a 5,9-fold decrease in the corrosion current density and a 22-fold increase in polarization resistance compared to the base PEO coating. Volumetric tests revealed a 4-fold decrease in the volume of released hydrogen after 7 days of exposure to NaCl. The highest inhibitor efficiency (83%) was achieved for samples with a hybrid coating, which confirms the promise of a combined approach for protecting magnesium alloys.
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A. S. Gnedenkov (2025) studied this question.
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