Protective conversion costings based on titanium and zirconium compounds for the AMg6 aluminum alloy

• V.A. Baranova, A.V. Kolesnikova, A.A. Abrashov, N.S. Grigoryan, V.A. Sukhorukova, D.V. Mazurova and T.A. Vagramyan

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

Abstract: This work is devoted to the study of the deposition of protective conversion titanium and zirconium-containing coatings on the AMg6 aluminum alloy with the goal of replacing chromate passivation in various industries. A solution containing hexafluorotitanic and hexafluorozirconic acids was developed. The deposition parameters of the self-adhesive coating were selected. The influence of the presence of organic acids in the passivating solution on characteristics such as the protective ability of the coatings formed, resistance to pitting corrosion, thickness, and adhesion strength of the paint coatings (PC) to the adhesive sublayer was established. The possibility of using the developed solution for sealing the anodic oxide layers of the surface of aluminum alloys is investigated. It was found that dilution of the working solution leads to an improvement in the protective ability of the finish coating. The test results showed that porous anodic oxide coatings sealed in Ti, Zr-containing solutions have higher protective properties and resistance to ultraviolet rays compared to porous anode-oxide coatings sealed in hot water.

Keywords: corrosion protection, conversion coatings, titanium, zirconium, surface preparation, chromate-free passivation, H2ZrF6, H2TiF6

Int. J. Corros. Scale Inhib., 2026, 15, no. 1, 170-182
doi: 10.17675/2305-6894-2026-15-1-8

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