Investigation of the Corrosion Resistance of Porous Permeable Materials with Protective Coatings

Abstract

It is known that porous permeable materials are subject to corrosion during filtration and cleaning of aggressive media, which leads to their failure. That is why the urgent task is to increase their corrosion resistance. This article is devoted to the study of the corrosion resistance of PPM with combined protective coatings applied to their surface in the form of table salt and hydrochloric acid. The corrosion resistance of PPM with combined protective coatings applied in solutions of sodium chloride and hydrochloric acid has been studied. Com-bined protective coatings were formed by the methods of electric arc spraying and aluminum alloy on the surface of PPM and subsequent plasma electrolytic treatment. As a result, a combined protective coating is formed on the surface of the PPM. Based on potentiodynamic mode established that the corrosion potentials in a solution of table salt move in the positive direction when a combined coating is applied to the surface of the PPM, which indicates a de-crease in the corrosion activity of the surface. The corrosion currents of the combined protective coating for all the studied systems are reduced by 3 or-ders of magnitude, and an increase in the ratio of the cathode to anode current density reduces the rate of corrosion of the coating by another five times