20th World Congress on Materials Science and Engineering
Title: High temperature corrosion resistance of inconel cladded layers in aggressive ash environment
Biography: Aleksandra Debowska
The choice of material used to work at high temperatures is one of the main problems while designing equipment for energy applications. Additionally, the presence of such elements as S, Cl, K or Na (typical elements which may be find at biomass or municipal wastes) in the work environment increases the possibility of corrosion occurrence. The aim of this study was to investigate the surface and cross-section of weld cladded (CMT, Cold Metal Transfer method) samples of Inconel 625 after exposure to different renewable fuel ashes at 650 °C for 500 h. Characterization of the Inconel samples and ashes after the corrosion process was performed using scanning electron microscopy (SEM) with EDAX analysis, X-ray fluorescence (XRF) and X-ray diffraction (XRD). Figure 1 shows cross-sectional image of Inconel sample after the corrosion process caused by mixed wood ash. On the surface, the corrosion products can be distinguished mostly oxides of elements such as chromium or nickel. Moreover some ashes compounds were observed as residues. There was proved that the effects of corrosion process depend on the type of ash used.