Abstract
Magnesium (Mg) alloys are lightweight materials with excellent mechanical properties, making them ideal for aerospace, automotive, and biomedical applications. However, their application is limited due to high susceptibility to corrosion, particularly in saline environments. Plasma electrolytic oxidation (PEO) is an effective method for enhancing the anti-corrosive properties of Mg alloys by forming protective oxide coatings. Despite these advantages, PEO coatings can suffer from limitations such as porosity, which compromises long-term protection. To address these issues, fluoride additives including F−, SiF62−, ZrF62−, TiF62−, and AlF63−, have been introduced into the PEO process. These additives significantly improve the anti-corrosive properties by forming MgF₂ and other stable metal oxide layers, which act as protective barriers. This review explores the effects and mechanisms of various fluoride additives in optimizing PEO coatings for Mg alloys, comparing their effectiveness in enhancing corrosion resistance and modifying surface morphology. It emphasizes the significance of fluorinated PEO in improving the performance and durability of coatings, providing valuable insights into optimizing coating processes for industrial applications.
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