Hot corrosion behavior of La2(Zr0.7Ce0.3)2O7 based coatings prepared by plasma spraying and exposed to molten salts at 1050°C in air

Hot-corrosion performance of plasma sprayed La-2(Zr0.7Ce0.3)(2)O-7 based coatings in contact with Na2SO4, V2O5, and Na2SO4+V2O5 mixtures (50:50wt%) were investigated at 1050 degrees C in air for 12h. Structural change is found to rank minimal to moderate and to be severe in case of exposures to Na2SO4, V2O5, and salt mixture, respectively. The pyrochlore-structured coating on exposure to salt mixture undergoes various chemical reactions and massive phase transitions, resulting in the formation of rare earth vanadates, lanthanum sulphates, and mainly the monoclinic and tetragonal phases of zirconia. Coatings exposed for 12 and 24h to salt mixture, exhibited almost no difference.