Features of Plasma-Electrolyte Synthesis of Heterooxide Nanocomposites on Multicomponent Alloys of Valve Metals

The chapter is devoted to the study of plasma-electrolyte synthesis features of heterooxide nanocomposites on multicomponent alloys of valve metals (aluminum and titanium alloys). A technological approach to the homogenization of the multicomponent alloys surface by plasma electrolytic oxidation has been developed. The choice of type and composition of complex electrolyte for surface treatment of multicomponent alloys is substantiated. The efficiency of using electrolytes based on alkali metal diphosphates is shown. The oxidation parameters and the composition of the modified surface of aluminum and titanium alloys of different composition were studied. The ways to control the surface homogenization process of multicomponent alloys are established. It is proved that during the PEO of aluminum and titanium alloys in a solution of 0.5–1.0 mol/dm3 K4P2O7 allows to reduce the content of alloying elements in the surface layers up to 4 times. A developed oxide matrix of the carrier metal (Al2O3, TiO2) is also formed. This is the basis for the development of catalytic material due to the targeted incorporation of the active components (oxides of cobalt/manganese). It is shown that in one technological process under the specified conditions (diphosphate electrolyte, PEO method) there is a formation of the heterooxide coatings. The kinetic regularities and peculiarities of the formation of the heterooxide layer on multicomponent alloys of different composition have been studied. It is established that the developed method allows forming heterooxide coatings with high adhesion, developed surface, and high content of oxides of active components (manganese, cobalt). The synthesized heterooxide systems on multicomponent aluminum (titanium) alloys have a set of enhanced functional properties. They can be used effectively in many industries, including the decontamination of toxic agents.