Abstract
In this paper, we have developed conditions for the deposition of zirconium oxide coatings from solutions containing hexafluorozirconic acid as well as tungsten and molybdenum salts on a steel base. Based on electrochemical studies, it was shown that the addition of tungsten and molybdenum salts to the solution to deposit zirconium oxide coatings led to the inhibition of the anodic process of iron ionization. It was shown that the optimal conditions for the deposition of oxide-zirconium coatings on the surface of steel samples from a solution of 0.2 g/L Zr (IV) + 0.15 g/L W (VI) + 0.1 g/L Mo (VI) were a deposition temperature of 30 °C and time of 10 min. The thickness of the oxide-zirconium coatings formed under these conditions was 64.72 nm, the adhesion value was 3.17 MPa/s, and the corrosion resistance was 26 s according to Akimov’s drop method. The depth of corrosive penetration, determined in the salt fog chamber, did not exceed 2 mm after 240 h of testing, meeting the requirements for adhesive layers under the paintwork.
Highlights
One of the most common methods for protecting metal structures from corrosion is the deposition of anti-corrosion protective coatings
Heavy metal ions form active centers that contribute to the deposition of zirconium oxide produced as a result of hydrolysis of hexafluorozirconic acid at pH 4.5 and 5.5 and room temperature [13,14,15]
We consider the combined effect of Mo (VI) and W (VI) ions on the formation of a zirconium oxide coating on the surface of steel samples
Summary
One of the most common methods for protecting metal structures from corrosion is the deposition of anti-corrosion protective coatings. Zirconium dioxide deposited from a solution provides the formation of chemical bonds of the produced film with both the metal base and with the subsequent paint and varnish coating. Since corrosion processes can be represented through a course of cathodic and anodic processes on a metal surface, the cyclic voltammetry method was used to study the corrosion resistance of the formed anticorrosive coatings. The method of cyclic voltammetry makes it possible to obtain independent information on the processes occurring on steel samples during the deposition of oxide-zirconium coatings, and at the same time to assess the degree of their corrosion resistance [7,16]. The proposed electrochemical method for assessing the anticorrosion resistance of coatings on steel samples can be used to establish the qualitative and quantitative composition of phosphating solutions and control the anticorrosive activity of the formed oxide-zirconium coatings
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