Corrosion of MA956 by Flowing Coal-Biomass Slags

Abstract

In this paper, we summarize the results of the laboratory scale tests of the corrosion rates of Special Metals MA956 during exposure to flowing coal/biomass slags at metal surface temperatures up to 1200{degree sign}C. The tests were performed in a bench- scale system for 100 hours each. The slag was heated to 1500 {degree sign}C before being poured onto the surface of the alloy which was cooled internally with flowing air. The results presented in the paper include measurements of surface recession and elemental diffusion both within the alloys and between the alloys and the slag. The data demonstrates that as long as the surface temperature of the alloy is kept below the solidus temperature of the slag, corrosion rates are very low and the slag creates a barrier to reduce the oxidation rate of the alloy.