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A direct comparative study of the corrosion behaviour of Si-free and Si-rich slurry aluminide coatings in molten carbonate melts
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Advisor(s)
Abstract(s)
ABSTRACT: This study is focused on the evaluation of the hot corrosion behaviour of two low-cost slurry aluminide coatings with and without Si addition deposited on ferritic-martensitic steels, comparing them with uncoated steel, after 1000-h of exposure to Li, K, Na molten carbonates at 650ºC, under static and dynamic conditions with a high linear velocity (1.3 m/s). Both coatings evidenced a high performance increase in comparison with uncoated substrates after exposure in both conditions. Both coatings behaved in a similar way according to the gravimetric results. However, after dynamic exposure, the Si-free aluminide maintained its morphology and composition after 1000 h with α-LiAlO2 as the only corrosion product while the Si-rich coating showed a higher attack extent in the outer part and developed a large quantity of voids at the coating/substrate
interface, leading to substrate corrosion.
Description
Keywords
Concentrated solar power Thermal energy storage High-temperature corrosion Coatings Molten carbonates
Citation
Audigié, P... [et.al.] - A direct comparative study of the corrosion behaviour of Si-free and Si-rich slurry aluminide coatings in molten carbonate melts. In: Livro de Resumos : 8as Jornadas de Corrosão e Proteção de Materiais, Fórum Tecnológico, Lisboa, 24 novembro, 2022, p. 33-35
Publisher
LNEG - Laboratório Nacional de Energia e Geologia