Flash-PEO as an alternative to chromate conversion coatings for corrosion protection of Mg alloy Article Swipe

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Chromate conversion coating Corrosion Conversion coating Materials science Coating Fluoride Metallurgy Corrosion inhibitor Flash (photography) Alloy Corrosion prevention Electrolyte Composite material Inorganic chemistry Chemistry Electrode Visual arts Physical chemistry Art

Ewa Wierzbicka , Bahram Vaghefinazari , Sviatlana V. Lamaka , Mikhail L. Zheludkevich , Marta Mohedano , Lara Moreno , Peter Visser , A. Rodrı́guez , Jorge H. Ramirez Velasco , R. Arrabal , E. Matykina ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.1016/j.corsci.2020.109189 · OA: W3110876691

In the present work, a flash-PEO coating is developed on AZ31B alloy in a combination of silicate, phosphate, and fluoride based electrolyte in order to offer a green alternative to chromate conversion coatings. Multilevel active protection is achieved through synergetic combination of self-sealing effect of PEO coating itself and active inhibition provided by an organic inhibitor impregnated in PEO pores in a post-treatment step. The results indicate that flash-PEO coatings, loaded with organic corrosion inhibitors, can be recommended for exploitation on industrial level as an equally effective corrosion protection system alternative to CCC for paint-bearing and paint-free applications.