DETERMINATION OF THE OPTIMAL DEPOSITION CONDITIONS OF OXIDE-ZIRCONIUM COATING ON STEELBASE.

In this paper, we developed a process for the deposition of adhesive oxide-zirconium coatings from solutions of hexafluorozirconic acid in the presence of Co (II) and Ni (II) ions on a steel base. The optimal conditions for the formation of oxide-zirconium coatings (concentrations of hexafluorozirconic acid, Co (II) and Ni (II) ions, temperature, pH, deposition time, thickness) are determined. The corrosion resistance of the obtained coatings was investigated depending on the change in the process parameters. It is found that the stabilization of the current-free potential and the optimum thickness of the zirconium oxide coating are achieved at close time parameters. The results of corrosion tests are in agreement with the adhesion strength of the obtained oxide-zirconium coatings on iron base in the temperature range 30-40°C. It is shown that the formed oxide-zirconium coatings satisfy the requirements imposed on adhesion layers for paint coatings. [ABSTRACT FROM AUTHOR]