Corrosion of Alumina Ceramics in an Aqueous Solution of Sodium Chloride
Two alumina based ceramics with 99.99 % and 95 % of Al2O3 were evaluated after dissolution in an aqueous solution containing 0.5 mol/l NaCl at temperatures of 150 and 200 °C. The weight loss of liquid phase sintered alumina was mainly attributed to congruent dissolution of SiO2 and CaO from grain-boundary amorphous film, which is accelerated at higher temperature, accompanied by precipitation of silicaceous phases from oversaturated solution at 200 °C. Pure polycrystalline alumina corroded by loss of alumina grains, which do not dissolve in the corrosion media.
J. Dusza, R. Danzer, R. Morrell and G.D. Quinn
D. Galusková et al., "Corrosion of Alumina Ceramics in an Aqueous Solution of Sodium Chloride", Key Engineering Materials, Vol. 409, pp. 283-286, 2009