Abstract
The aim of the research presented was to investigate the influence of different biomass ash at corrosion condition T = 650°C for 2000 h on the surface of weld cladded (CMT) stainless steels 309. The biomass ashes are rich in K2O, CaO, SiO2, whereas sewage sludge ash in P2O5, CaO, Fe2O3 and SiO2. Characterization of the stainless steel cross-section after the corrosion process inducted by the presence of ash were carried out SEM with EDS analysis. Phase analysis of corrosion products was made by X-ray diffraction (XRD) and simulated using FactSage version 8.3. It has been proved that biomass ashes have the corrosive properties, due to the presence of potassium, and are more aggressive than the sewage sludge ash.