Electrochemical oxidation of ZrB2–MoSi2 ceramics in a 3% NaCl solution

Electrochemical oxidation of ZrB 2 and MoSi 2 refractory compounds as well ZrB 2 –MoSi 2 ceramics in a 3% NaCl solution is studied using the method of polarization curves, quantitative AES, and SEM. It is established that the highest corrosion resistance is observed in the case of composites with a small amount (~5–10 wt.%) of MoSi 2 due to their stable passivation at comparatively low anodic potentials. It is shown that the corrosion rate of a molten ZrB 2 sample is 90% lower than that of a hot-pressed one.