Hot corrosion behaviour of Al-Si coating in mixed sulphate at 1150 ˚C

Abstract

Abstract Hot corrosion test of Al-Si coating was investigated at 1150 ˚C based on the results reported from previous work which was conducted at 1050 ˚C. It has been observed that the coating failed after 20 h of hot corrosion. When the temperature of hot corrosion reached 1150 ˚C, the dissolution effect of the molten salt to Al2O3 scale was sharply enhanced. Therefore, during hot corrosion, Al-Si coating was not able to generate a protective oxide scale, and the original anti-oxidation and corrosion mechanism of diffusion barrier of Al-Si coating cannot be retained.