“…It is well known that the use of various substances in the form of particles as a dispersion phase of the electrolyte under PEO is one of the most effective ways to improve the protective and functional properties of oxide coatings, as well as to increase the productivity and efficiency of the PEO technology [ [18] , [19] , [20] , [21] , [22] , [23] , [24] ]. The using of SiO 2 , ZrO 2 , TiN, Si 3 N 4 , TiO 2 , TiC, MoS 2 particles, carbon nanotubes or halloysite nanotubes as additions to the electrolyte during PEO has led to significant improvement of wear- and corrosion resistance of formed oxide layers [ 21 , [25] , [26] , [27] , [28] , [29] , [30] ]. Silicon dioxide in a nanoscale form is one of the most proven substances as an additive to the electrolyte in the PEO of aluminum, magnesium and titanium alloys.…”