Protective conversion coatings based on rare-earth compounds for passivation of galvanized steel

• A.A. Abrashov, A.V. Sundukova, N.S. Grigoryan, N.A. Asnis, N.A. Khazanov, T.A. Chudnova and E.A. Zheludkova

D. Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, 125047 Moscow, Russian Federation

Abstract: The publication deals with the development of a process for applying protective conversion coatings containing rare earth metals (REMs) on the surface of galvanized steel to replace environmentally hazardous chromating processes. The compositions of solutions for the deposition of individual protective/decorative or adhesive coatings have been optimized, and the physicochemical and mechanical properties of coatings that might be potential alternatives to toxic chromate coatings have been studied. The addition of rare-earth metal (REM) compounds and citric acid to the solutions increases the protective ability, abrasion resistance, frost and heat resistance of the coatings being formed, and improves the appearance and thickness uniformity.

Keywords: corrosion protection, conversion coatings, surface treatment, chromate-free passivation, rare earth metals

Int. J. Corros. Scale Inhib., 2022, 11, no. 4, 1749-1762
doi: 10.17675/2305-6894-2022-11-4-22

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