Protective wear-resistant superhydrophobic coatings on the surface of anodized magnesium alloy AAZ31B

• A.A. Abrashov, A.A. Petrushina, V.K. Lyamina, N.S. Grigoryan, V.A. Sukhorukova, N.A. Asnis and A.A. Aivazyan

Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Sq., 125047 Moscow, Russia

Abstract: One of the approaches that has recently gained interest for protecting metallic surfaces from aggressive environments is the formation of continuous surface films with water-repellent and self-cleaning properties (so-called superhydrophobic films). A known drawback of chemically produced superhydrophobic coatings (SHC) is their low wear resistance. In the present work, the possibility of improving the wear resistance of SHC by preliminary anodic oxidation of magnesium alloy AZ31B was studied. An electrolyte containing 60 g/L NaOH and 30 g/L Na₃PO₄ for the anodic oxidation of the surface of magnesium alloy AZ31B was designed. It was found that anodization in this electrolyte results in the formation of anodic oxide films with the required developed microstructured topography. Preliminary anodization of the magnesium surface was shown to increase the adhesion strength with the SHC formed and, consequently, to enhance its wear resistance. Corrosion tests in a salt spray chamber demonstrated that the designed coating withstands 230 h under salt spray conditions (5% NaCl) before the first signs of corrosion appear on the substrate, whereas the untreated magnesium alloy begins to corrode after 5 hours.

Keywords: superhydrophobic coatings, surface treatment, corrosion protection, stearic acid, hydrophobization, anodizing of magnesium, wetting angle

Int. J. Corros. Scale Inhib., 2025, 14, no. 4, 2425-2438
doi: 10.17675/2305-6894-2025-14-4-38

Download PDF (Total downloads: 33)

Back to this issue content: 2025, Vol. 14, Issue 4 (pp. 1685-2564)