Composite coatings obtained by the PEO-method followed by the deposition of a polymer from an aqueous suspension of UTPFE. E.A. BELOV, K.V. NADARAIA, D.V. MASHTALYAR, I.M. IMSHINETSKIY, A.K. TSVETNIKOV, S.L. SINEBRYUKHOV, V.M. BUZNIK, S.V. GNEDENKOV

Abstract

Composite coatings obtained by the PEO-method followed by the deposition of a polymer from an aqueous suspension of UTPFE. E.A. BELOV¹, K.V. NADARAIA^1,2, D.V. MASHTALYAR^1,2, I.M. IMSHINETSKIY¹, A.K. TSVETNIKOV¹, S.L. SINEBRYUKHOV¹, V.M. BUZNIK^1,3, S.V. GNEDENKOV¹ (¹Institute of Chemistry, FEB RAS, Vladivostok; ²Far Eastern Federal University, Vladivostok; ³All-Russian Research Institute of Aviation Materials, Moscow).

The paper presents a comprehensive study of composite polymer-containing coatings on the MA8 magnesium alloy, formed by plasma electrolytic oxidation (PEO) followed by the deposition of a fluoropolymer from an aqueous suspension of ultradispersed polytetrafluoroethylene. By the methods of scanning electron microscopy, energy dispersive and X-ray phase analysis, morphological features, elemental and phase composition of composite coatings have been established. The fact of filling the pores with a fluoropolymer has been experimentally confirmed. Evaluation of the corrosion properties of the formed composite coatings revealed a decrease in the corrosion current density by more than 4 orders of magnitude in comparison with the base PEO layer. The highest resistance to the destructive effects of a corrosive environment, according to the results of tests in a salt fog chamber, was demonstrated by coatings after three times treatment with polytetrafluoroethylene. The resulting polymer-containing coatings have antifriction properties, reducing coating wear by more than 27 times in comparison with the base PEO layer. It was found that composite coatings have superhydrophobic properties: the contact angle reaches 154º, and the contact angle hysteresis is less than 10º.