Abstract
This study addresses the effect of pre-oxidation on the corrosion resistance of the following three commercial steels: a low-alloyed ferritic 10CrMo9-10 steel; a Nb-stabilized austenitic AISI 347 steel; and a high-alloyed austenitic Sanicro 28 steel. Samples of these three steels were pre-oxidized under various conditions and then exposed to potassium chloride (KCl) for 168 h at 550 °C under dry conditions. In the case of the ferritic 10CrMo9-10 and the austenitic AISI 347 steels, despite differences in oxide scale composition and structure, their corrosion resistance could not be improved by any of the studied pre-oxidation procedures. In contrast, pre-oxidation conditions resulting in chromium-enriched oxides improved the corrosion resistance of the high-alloyed austenitic Sanicro 28 steel in terms of oxide scale growth during exposure to KCl.
Highlights
Substituting renewable fuels for fossil fuels has steadily increased during the last two decades
This study addressed the effect of pre-oxidation on the corrosion resistance of three commercial steels
Pre-oxidation conditions resulting in chromium-enriched oxides improved the corrosion resistance of the high-alloyed austenitic Sanicro 28 steel in terms of oxide scale growth during the exposure to KCl
Summary
Substituting renewable fuels for fossil fuels has steadily increased during the last two decades. The main reasons are the limited reservoirs of fossil fuels and because of high greenhouse gas and particle emissions, which are often coupled with coal combustion [1]. In contrast to fossil fuels, biomass is considered to be a C O2-neutral fuel with vast reservoirs, making it an appealing alternative. Different types of wastederived fuels are considered to be an option when striving for environmentally more sustainable power production. To slow or reduce corrosion, power plants using renewables are operated at lower steam temperatures, reducing the power production efficiency. More efficient ways to prevent corrosion are needed, so that power plants using biomass and waste-derived fuels can operate at higher steam temperatures
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