%0 journal article
%@ 2213-9567
%A Rakoch, A., Monakhova, E., Khabibullina, Z., Serdechnova, M., Blawert, C., Zheludkevich, M., Gladkova, A.

%D 2020
%J Journal of Magnesium and Alloys
%N 3
%P 587-600 
%R doi:10.1016/j.jma.2020.06.002
%T Plasma-electrolytic oxidation of AZ31 and AZ91 magnesium alloys: comparison of coatings formation mechanism
%U https://doi.org/10.1016/j.jma.2020.06.002
3 
%X Thus, it was demonstrated that a good corrosion resistance of the coatings was only obtained on AZ91 and if the average thickness of the coating is around 50 µm, correlating with the formation of a sufficiently dense inner layer. Knowing this mechanism, a new two-step treatment was suggested, combining the standard PEO treatment with a subsequent PEO process in an electrolyte supporting the inner film formation. The concept was successfully applied and a further improved corrosion resistance was obtained compared to the single stage PEO process. This improvement of corrosion resistance was related to the better sealing of porosity and formation of a denser inner layer.