Pierre-Jean Panteix

Stability of Protective Oxide Layer Against Corrosion: Solubility Measurements of Chromium in Soda Lime Silicate Melts

The solubility of chromium oxide (Cr2O3) in soda lime silicate glasses was studied as a function of temperature (1,200xa0°Cxa0≤xa0Txa0≤xa01,350xa0°C), oxygen fugacity (−12xa0≤xa0log fO2xa0≤xa0−0.6) and glass composition (Na2O–CaO–xSiO2; xxa0=xa03, 4, 5 and 6). The fO2 was proved to induce several oxidation states of Cr for a given glass composition at a fixed temperature. The influence of glass composition on the Cr solubility was interpreted in terms of the optical basicity Λ concept. An increase in the melt basicity led to an increase in the Cr solubility for the experiments conducted under oxidizing conditions. The total dissolved Cr also showed a significant increase with increasing temperature for a given fO2 and glass composition. The results proved that the stability of Cr2O3 scale against corrosion was profoundly influenced by fO2, T and melt basicity.