The influence of pyrophosphate cobalt-containing electrolyte composition and operating parameters of plasma-electrolytic oxidizing on the process of formation of oxide coatings on silumin was studied. It was established that the use of given type solutions contributes to the homogenization of silumin surface and creates preconditions for the dopant incorporation to the growing oxide coating. It is shown that PEO parameters depend on the concentration ratio of cobalt sulfate and potassium pyrophosphate in a working solution. The formation of PEO coatings on high-silicon silumin with a maximum content of cobalt at minimizing the impurities is expedient to carry out from the electrolyte with a composition of 0.4 mol/dm3 K4P2O7, 0.1 mol/dm3 CoSO4. The rational mode of plasma-electrolytic treatment of silumin in pyrophosphate electrolyte for obtaining oxide coatings, enriched with cobalt, was substantiated. It is advisable to perform formation of PEO coatings of developed globular-mosaic surface, with maximum cobalt content and minimizing impurities in the range of current densities of 3–5 A/dm2 within 20–40 minutes.
Based on the results of experimental study, we demonstrated the ways to control the structure and surface morphology of cobalt-containing PEO coatings through the variation in the concentrations of electrolyte components, PEO parameters, and oxidizing time.
It was shown that inclusion of cobalt into the composition of surface oxide layers leads to a change of morphology and topography of the surface. The inclusion of cobalt to oxide layer composition leads to the formation of a mosaic three-dimensional surface structure. Obtained oxide systems have a high degree of surface development and consist of nanostructured spherical conglomerates.
The mixed oxide coatings incorporated by cobalt can be used in the air and water purification systems and in the ecological catalysis, specifically, for intracylinder catalysis of gas emissions of internal combustion engines.
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