Abstract
Hot corrosion is a severe form of industrial corrosion which occurs at high temperatures under the influence of oxidizing gases and can be prominently linked to the formation of a molten salt/ash layer over any metallic substrate. Throughout the years, several types of inhibitors and coatings have successfully been employed to reduce its devastating effects to a certain extent. In this study, two synthesized metal oxides namely Al2O3 and MnO2 were used as corrosion inhibitors and XRD, FTIR analysis were carried out to assess their structural properties. Further, TGA analysis for Al2O3 and MnO2 was carried out to determine thermal stability characteristics. The as-synthesized materials were further deposited as inhibitor coatings (Al2O3 with MnO2 bond coating, MnO2 coating and Al2O3 + 50% MnO2 coating) on T22 boiler steel specimens. All the specimens (bare T22 and coated T22 steel) were investigated for hot corrosion studies in Na2SO4-60%V2O5 environment at the temperature of 900 °C for 50 consecutive cycles. Every cycle involved a 1-h heating step in furnace followed by 20-min cooling at room temperature. Weight gain data were collected using a digital balance. XRD and (SEM–EDS) analysis were carried out to characterize the samples after exposure to hot corrosion environment. A better resistance to hot corrosion was observed for all the different types of coatings, with Al2O3 + 50% MnO2 coating representing maximum resistance. A high concentration of protective oxides such as Al2O3 and Cr2O3 present on the surface and their interaction to form dense layers on the coated samples explains the enhanced hot corrosion inhibition.
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Chaudhary, R., Kaur, A., Bala, N. et al. Effect of Superficially Applied MnO2 and Al2O3 Oxide Inhibitors in Enhancing High-Temperature Corrosion of T22 Boiler Steel. High Temperature Corrosion of mater. (2024). https://doi.org/10.1007/s11085-024-10240-3
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DOI: https://doi.org/10.1007/s11085-024-10240-3