Protective properties of Zr-containing conversion coatings on zinc
https://doi.org/10.29235/1561-8331-2022-58-1-94-104
Abstract
The aim of the study is to develop an environmentally friendly chromium-free passivation technology for galvanized steel. Passivation of zinc coatings was carried out by deposition of conversion coatings from solutions containing ZrO(NO3)2, Na2SiF6 and oxidizer H2O2 or K2S2O8. The effect of the solution pH, the concentration of Na2SiF6 and the type of oxidizer on the protective properties of coatings was studied by the drop method and electrochemical method of linear voltammetry in 3 % NaCl using the full factor experiment 23 . The main effects and effects of the interaction of the studied factors for the darkening time of the droplet and the dissolution potential of zinc are calculated. The solution pH in the presence of the oxidizing agent K2S2O8 influences the both parameters in the most extent. Concentration of Na2SiF6 has a significant effect on the dissolution potential of zinc and the least effect on the darkening time of the droplet. An increase in the solution pH and the concentration of Na2SiF6 increases the protective properties of the coatings. Measurements of the mass loss and open circuit potential during the resource testing of conversion coatings in 3% NaCl showed an increase in the corrosion rate over time.
About the Authors
A. V. Tarasevich
Belarusian State Technological University
Belarus
Belarus
Tarasevich Aleksandr V. – student
13a, Sverlova str., 220006, Minsk
V. G. Matys
Belarusian State Technological University
Belarus
Belarus
Matys Vladimir G. – Ph. D. (Chemistry), Associate Professor
13a, Sverlova str., 220006, Minsk
V. V. Poplavskiy
Belarusian State Technological University
Belarus
Belarus
Poplavskiy Vasiliy V. – Ph. D. (Physics), Associate Professor
13a, Sverlova str., 220006, Minsk
V. A. Ashuiko
Belarusian State Technological University
Belarus
Belarus
Ashuiko Valeriy A. – Ph. D. (Chemistry), Associate Professor
13a, Sverlova str., 220006, Minsk
I. M. Zharskiy
Belarusian State Technological University
Belarus
Belarus
Zharskiy Ivan M. – Ph. D. (Chemistry), Professor
13a, Sverlova str., 220006, Minsk
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