Abstract
A process was developed for chromate-free passivation of zinc-plated surfaces via formation of conversion silicon-containing coatings on these surfaces. The passivation performed in a solution containing 20–35 g L−1 sodium metasilicate, 0.2–0.5 g L−1 phosphonic acid, 20–30 mL L−1 H2O2, 200–500 mg L−1 saccharine, and 4–10 mg L−1 potassium pyrophosphate at pH 2.0–2.5 and temperature of 18–25°C in the course of 4 min. A warming-up of the solution to 40°C is allowed. The developed silicon-containing passivating coatings on zinc-plated steel details are comparable in corrosion resistance and protective capacity with iridescent chromate coatings, but, in contrast to the latter, sustain a thermal shock without deterioration of their protective characteristics and are more wear resistant.
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The study was financially supported by D. Mendeleev University of Chemical Technology of Russia, project no. 016-2018.
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Russian Text © The Author(s), 2019, published in Zhurnal Prikladnoi Khimii, 2019, Vol. 92, No. 10, pp. 1344–1351.
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Abrashov, A.A., Grigoryan, N.S., Zheludkova, E.A. et al. Silicon-containing Solution for Passivation of Zinc Coatings. Russ J Appl Chem 92, 1432–1438 (2019). https://doi.org/10.1134/S1070427219100136
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DOI: https://doi.org/10.1134/S1070427219100136