  Increasing pressure on the power industry to reduce carbon emissions has led
to increased research into the use of biomass feedstocks. This work
investigates the effects of HCl and KCl, key species influencing biomass boiler
corrosion, on a laser clad coating of the FeCrAl alloy Kanthal APMT. In-Situ
SEM exposure of the coating at 450 oC for 1 h was performed to investigate the
initial effects of KCl on the corrosion process. The same coatings were exposed
to 250 h exposures in both an air environment and a HCl rich environment. The
influence of KCl was investigated in both. Evidence of a slow growing aluminium
oxide was observed. It was found that HCl allowed chlorine based corrosion to
occur suggesting it can interact from the gas phase. It was also observed that
the presence of both HCl and KCl reduced the mass gain compared to KCl in an
air environment.
