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Abstract
This study investigated the effects of HCl and KCl on a laser-clad FeCrAl coating at 450 °C in an in-situ ESEM followed by a furnace exposure. In all in-situ TEM cross-sections, three major phases were identified: an iron rich oxide, an iron-chromium mixed oxide and an aluminium enriched layer. HCl allowed chlorine based corrosion to occur which suggests interaction from its gas phase. EDX of the regions around KCl crystals showed a decrease in chromium which is an indication of chlorine selectively removing chromium. Moreover, the mass gain in HCl with KCl was significantly lower than that observed in air with KCl.
Highlights
As we transit to more sustainable power generation, there has been an increase in the uptake of biomass combustion as an alternative to conventional fossil fuels [1]
As oxygen has been excluded from the Energy-Dispersive X-ray (EDX) measurements, this transition region most probably represents the iron-chromium spinel
The corrosion performance was tested in in-situ ESEM, air and HCl rich environment for 1–250 h at 450 °C
Summary
As we transit to more sustainable power generation, there has been an increase in the uptake of biomass combustion as an alternative to conventional fossil fuels [1]. One of the techniques used to combat the aggressive high temperature corrosion environments within boilers is to use corrosion resistant materials. Many of these materials are expensive, and as such it is not economically feasible to replace conventional ferritic steels. In these situations, a surface engineering solution or a corrosion resistant coating can be applied. One such technique is laser cladding, where the feedstock material is fed into a meltpool on the surface of the substrate generated by a laser—as the meltpool is moved across the surface a coating is built up
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