Abstract
Earlier developed approaches to the formation of composite polymer-containing coatings by plasma electrolytic oxidation (PEO) using various low-molecular fractions of superdispersed polytetrafluoroethylene (SPTFE) have been summarized and a unique method for the formation of composite polymer-containing coatings at the surface of magnesium alloy MA8 has been suggested. The improvement in the corrosion and tribological behavior of the polymer-containing coating can be attributed to the morphology and insulating properties of surface layers and the solid lubrication effect of SPTFE particles. Such multifunctional coatings have high corrosion resistance (Rp = 3.0 × 107 Ω cm2) and low friction coefficient (0.13) under dry wear conditions.The effect of dispersion and ξ-potential of the nanoparticles (ZrO2 and SiO2) used as an electrolyte component for PEO on the composition and properties of the coatings has been investigated. Improvement of the protective properties for coatings with the incorporated nanoparticles has been explained by the greater thickness of the protective layer, relatively low porosity and the presence of narrow non-through pores. The layer with zirconia has an impedance modulus measured at low frequency (|Z|f→0Hz = 1.8 × 106 Ω cm2) more than one order of magnitude higher than the PEO-coating formed in the electrolyte without nanoparticles (|Z|f→0Hz = 5.4 × 104 Ω cm2).
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