Effect of SiO2 Nanoparticles and Soluble Silicate on the Composition and Properties of Oxide Layers Formed by Microarc Oxidizing on Magnesium Mg96

Resumo

Oxide layers deposited on magnesium by microarc oxidizing with introduction of different silicon-containing components, i.e., nanoparticles of SiO₂ and Na₂SiO₃ sodium metasilicate, into the electrolyte are studied. The effects due to individual and joint use of these substances as components of the electrolyte are compared. It is shown that the best wear resistance of the oxide layers is provided after addition of SiO₂ nanoparticles into the electrolyte, and the best corrosion resistance is obtained due to joint introduction of SiO₂ nanoparticles and sodium metasilicate. The mechanisms of interaction between SiO₂ nanoparticles and the forming oxide layer are suggested.