Anodic Oxidation of SiC–TiB₂–B₄C Composites in 3% NaCl Solution

Abstract

Polarization curves and Auger spectroscopy are used to study the kinetics, formation mechanism, and layer-by-layer phase composition of oxide films resulting from the anodic oxidation of SiC–TiB₂–B₄C ceramics containing 10 wt.% and 40 wt.% TiB₂ in 3% NaCl solution. It is shown that two-layer oxide films forms in the former case (β-Ті₂О₃ is the lower layer and TiO₂ the upper one) and three-layer film forms in the latter case (nonstoichiometric β-ТіО is the upper and lower layers and β-Ті₂О₃ the intermediate one). Both ceramic samples, especially those with 10 wt.% TiB₂, have high corrosion resistance.