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Hot Corrosion Behaviour of Electroless Deposited Nano-structured Cerium Oxide Coatings on Superalloy
Cerium oxide film was developed on Superni-75, via electroless method using cerium acetate and triethanolamine. Hot corrosion studies were conducted on bare substrate and the cerium oxide-coated superalloy after exposure to a molten salt environment of Na2SO4–60%V2O5 at 900 °C under cyclic conditions. The weight change measurements were taken to calculate the cyclic hot corrosion kinetics of the coatings at 900 °C. The structural features of the samples were characterized by SEM/EDS and XRD. It was observed that the corrosion rate of cerium oxide-coated superalloy is lower than that of the uncoated superalloy due to the formation of dense and protective oxide scale over the surface of the coatings. In spite of the combined effect of thermal cycling and an aggressive environment, the weight variation per unit area was found to decrease as the cerium concentration increased. Cerium oxide film was able to impede the movement of ions, thereby reducing the short-circuit diffusion of ions. Also, there was an improvement in resistance to spallation in the coated specimens with increase in cerium concentration.
Hot Corrosion Behaviour of Electroless Deposited Nano-structured Cerium Oxide Coatings on Superalloy
Cerium oxide film was developed on Superni-75, via electroless method using cerium acetate and triethanolamine. Hot corrosion studies were conducted on bare substrate and the cerium oxide-coated superalloy after exposure to a molten salt environment of Na2SO4–60%V2O5 at 900 °C under cyclic conditions. The weight change measurements were taken to calculate the cyclic hot corrosion kinetics of the coatings at 900 °C. The structural features of the samples were characterized by SEM/EDS and XRD. It was observed that the corrosion rate of cerium oxide-coated superalloy is lower than that of the uncoated superalloy due to the formation of dense and protective oxide scale over the surface of the coatings. In spite of the combined effect of thermal cycling and an aggressive environment, the weight variation per unit area was found to decrease as the cerium concentration increased. Cerium oxide film was able to impede the movement of ions, thereby reducing the short-circuit diffusion of ions. Also, there was an improvement in resistance to spallation in the coated specimens with increase in cerium concentration.
Hot Corrosion Behaviour of Electroless Deposited Nano-structured Cerium Oxide Coatings on Superalloy
J. Inst. Eng. India Ser. D
Lone, Shafaq Ashraf (Autor:in) / Rahman, Atikur (Autor:in)
01.06.2020
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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