СВЯЗЬ КОРРОЗИОННОЙ СТОЙКОСТИ ПОВЕРХНОСТИ ДЕТАЛЕЙ С АДГЕЗИОННОЙ ПРОЧНОСТЬЮ ВИБРАЦИОННЫХ МЕХАНОХИМИЧЕСКИХ ПОКРЫТИЙ

Abstract

The paper shows the relationship of corrosion resistance with the strength of mechanochemical zinc coatings formed in vibration technological systems. It is considered that coating process is a combination of mechanical and physico-chemical phenomena occurring simultaneously in the surface layer of the metal under the shock and pulse action of the activating medium indentors on it under conditions of low-frequency oscillations; at the same time, a coating is formed in the zone of local coating-substrate contact interaction, and its main parameter is adhesion. It is found out that the same adhesive strength of the coating can be provided as a result of varying the energy contribution to the process of coating formation by the chemical interaction of the coating medium with metal and the mechanical action of the indentors on the surface to be coated. The correlation dependence of the corrosion resistance estimated by the permeability indicator on the adhesive strength of the coating is proposed, which allows at the stage of technological preparation of production to design technological regulations with sufficient accuracy for practice by regulating the mechanical and chemical parameters of the process, while providing the adhesive strength required by the operating conditions and the most environmentally preferable conditions for the coating. It is noted: the technological efficiency of the coating process with the control of mechanical parameters is 2-3% higher compared to the control of the process by chemical parameters; for structural steel samples, under the selected coating conditions, corrosion resistance increases from 9.8 to 46.6 times in relation to uncoated samples. This indicates a high level of protective anticorrosive properties of vibrational mechanochemical zinc coatings.