Abstract
The widespread use of magnesium―lithium (Mg―Li) alloys is frequently hampered by the grand challenge associated with their high propensity to corrosion. Herein, we describe a method to access anti-corrosion coatings on Mg―8.5Li alloy employing plasma electrolytic oxidation (PEO) technique with phosphate additive. Our results reveal the oxide coating has a compact and uniform structure after 10-min PEO treatment, along with higher thickness (˜28 μm), hardness, and wettability (28°). Electrochemical measurements demonstrate the coating endows a significant enhancement in corrosion resistance for the Mg―8.5Li alloy along with a decent long-term protection for 300 h.
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