Change in the properties of composite coatings during climatic tests in a salt spray chamber. D.V. MASHTALYAR, K.V. NADARAIA, E.A. BELOV, S.L. SINEBRYUKHOV, S.V. GNEDENKOV
Keywords:
magnesium, plasma electrolytic oxidation, composite coating, polymer-containing coating, climatic tests, salt spray chamber, protective coatings, corrosion resistanceAbstract
Change in the properties of composite coatings during climatic tests in a salt spray chamber. D.V. MASHTALYAR1,2, K.V. NADARAIA1,2, E.A. BELOV1, S.L. SINEBRYUKHOV1, S.V. GNEDENKOV1 (1Institute of Chemistry, FEB RAS, Vladivostok, 2Far Eastern Federal University, Vladivostok).
The paper presents analysis of changes in the protective properties of composite coatings obtained on the MA8 magnesium alloy by plasma electrolytic oxidation followed by treatment in an aqueous suspension of superdispersed polytetrafluoroethylene, during salt spray test. The dynamics of changes in the electrochemical properties of composite polymer-containing coatings was studied. The effect of the multiplicity of the application of the composite layer on the corrosion resistance of the coatings was estimated. It was established that the polymer-containing coating obtained by the plasma electrolytic oxidation and threefold treatment in the superdispersed polytetrafluoroethylene suspension has the highest resistance to corrosion due to the greater homogeneity of the obtained composite layer. After 40 days of exposure to an aggressive corrosive environment, the values of polarization resistance and impedance modulus for this type of coating are one order of magnitude higher than those for the base PEO-coating before test.
