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The present work is devoted to the study of the mechanism of the process of formation of adhesive oxide-titanium coatings on steel, zinc, and aluminum surfaces. For the first time, the following hypothesis has been confirmed experimentally, namely, that nickel, being the first metal to be deposited on a steel substrate, creates active centers on which titanium oxides are formed, because the hydrolysis of hexafluorotitanic acid is adsorbed, which then form a continuous film. The data obtained, regarding the dependence of the coating thickness on the linear rate of the solution flow along the treated surface, indirectly confirm that the formation of insoluble titanium oxides occurs because of the alkalization of the solution adjacent to the surface. It has been established that in the presence of hexavalent molybdenum compounds in the solution as oxidizers, molybdenum is included in the coating in the form of oxides. It has been revealed that in the lower layers of the coating, molybdenum is contained in the form of compounds of molybdenum (V) and (VI), while in the upper layers, it is contained only in the form of the compound of molybdenum (VI).

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Electrochemical oxidative polymerization of o-phenylenediamine on a carbon fi ber anode under potentiostatic conditions was studied. Deposition of poly(o-phenylenediamine) on the carbon fi ber surface was proved by scanning electron microscopy and IR spectroscopy. The electrodeposition of poly(o-phenylenediamine) on the carbon fi ber surface enhances the strength of carbon-fi ber-reinforced composite materials with epoxy matrix.

A solution is developed and the parameters of the process for depositing ceramic nanosize titanium-oxide coatings satisfying the requirements of adhesion layers beneath paint coats are determined.

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