New generation composite coatings with the function of «active» corrosion protection of magnesium alloys. A.S. GNEDENKOV, S.L. SINEBRYUKHOV, D.V. MASHTALYAR, V.S. EGORKIN, I.E. VYALIY, S.V. GNEDENKOV

Abstract

New generation composite coatings with the function of «active» corrosion protection of magnesium alloys. *A.S. GNEDENKOV¹, S.L. SINEBRYUKHOV¹, D.V. MASHTALYAR^{1, 2}, V.S. EGORKIN¹, I.E. VYALIY¹, S.V. GNEDENKOV¹ (¹Institute of Chemistry, FEB RAS, Vladivostok; ²Far Eastern Federal University, Vladivostok). *E-mail: asg17@mail.com

A new method of the formation of composite coatings with the function of «active» corrosion protection of  magnesium alloys was developed using plasma electrolytic oxidation method (PEO). The electrochemical properties of these protective coatings formed on MA8 magnesium alloy were studied. The effect of corrosion inhibitor impregnated into pores of the surface layer on the coating protective properties in a corrosive medium was established. Additional protection was achieved using controllable pore sealing by polymer. It was established that polymer treatment of the PEO-layer does not reduce the inhibitor efficiency. The formed protective composite polymer- and inhibitor-containing coatings decrease the corrosion current density of the magnesium alloy in a 3 % NaCl solution up to three orders of magnitude. This predetermines the prospects of new generation coatings formation that sufficiently expand the application field of electrochemically active materials.