The corrosion protection afforded by rare earth conversion coatings applied to magnesium

By Amy L. Rudd, C. Breslin, F. Mansfeld. 2000

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Formation of Mg,Al-hydrotalcite conversion coating on Mg alloy in aqueous HCO3−/CO32− and corresponding protection against corrosion by the coating (2009, background): “Several promising chromate-free conversion coatings of Mg alloys, including phosphate [22–25], phosphate–permanganate [26,27], stannate [27–31], vanadate [32], cobalt-III hex coordinated complex [33], cerate [34–37] or lanthanite [35] or praseodymate [35] and other coatings have been studied.”
Alternative conversion coatings to chromate for the protection of magnesium alloys (2014, neutral): “3 g/L [39,59,60].”
Comprehensive screening of Mg corrosion inhibitors (2017, background): “Multiple experimental reports confirmed that once deposited in optimized conditions, ceria based conversion coatings provide effective barrier for bare or PEO treated Mg alloys [7, 8, 56, 89-92].”
Environmentally Friendly Anticorrosive Polymeric Coatings (2021, methodology): “based on sol-gel technologies and hybrid inorganic-organic pre-treatments such as nano ceramic coatings using titanium [25], zirconium [26], silicate, rare earth metals [27], and molybdates [28] compounds as greener alternatives.”