Hybrid polymer-containing coatings, impregnated with a corrosion inhibitor, formed for protection of biodegradable magnesium alloys. A.S. GNEDENKOV, V.S. FILONINA, S.L. SINEBRYUKHOV, V.I. SERGIENKO, S.V. GNEDENKOV

Abstract

Hybrid polymer-containing coatings, impregnated with a corrosion inhibitor, formed for protection of biodegradable magnesium alloys. A.S. GNEDENKOV, V.S. FILONINA, S.L. SINEBRYUKHOV, V.I. SERGIENKO, S.V. GNEDENKOV (Institute of Chemistry, FEB RAS, Vladivostok).

The paper presents the results of a study of the electrochemical properties of hybrid polymer-containing coatings with a self-healing function based on oxide layers formed by plasma electrolytic oxidation (PEO) on biodegradable magnesium alloy MA8. As a result of the research, it was found that the impregnation of the corrosion inhibitor 8-hydroxyquinoline (8-HQ) into the structure of the composite polymer-containing layers provides a significant increase in the corrosion resistance of the base PEO layer and makes it possible to control the rate of resorption of the implant due to the self-healing effect of the coating. At the same time, among all the formed layers, hybrid coatings obtained by impregnating the porous part of the base PEO-layer with inhibitor and a polymer from the solution based on dichloromethane have the best electrochemical characteristics. The decrease in corrosion current density Ic for these coatings was 5 orders of magnitude, comparing to a system without inhibitor. The inhibitor efficiency index for these coatings also has the highest values among all studied inhibitor-containing systems and reaches 83.9 % even after the samples immersion to 3 % NaCl solution for 22 h.