Steam oxidation resistance and performance of newly developed coatings for Haynes® 282® Ni-based alloy. (1st July 2018)

• Record Type: Journal Article
• Authors: Dudziak, T.; Boron, L.; Gupta, A.; Saraf, S.; Skierski, P.; Seal, S.; Sobczak, N.; Purgert, R.
• Is Part Of: Corrosion science. Volume 138(2018)
• Page Start: 326
• Page End: 339
• Publication Date: 2018-07-01
• Subjects: A. Nickel alloy -- A. ceramic -- B. SEM -- B. XRD -- C. Oxide coatings -- C. oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.04.005
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Steam oxidation study on bare and ceramic coated Haynes ® 282 ® alloy at 800 °C for 2000 hours performed. Nano CeO2, Al2 O3, YSZ and Al2 O3 -Graphene oxide coatings with/out bond coat (Ni-5 wt.% Al) deposited on Haynes ® 282 ® alloy using air plasma spray. High degree of internal oxidation observed in Haynes ® 282 ® alloy. Plasma sprayed nano CeO2 coating with no bond coat reduced internal oxi-dation process extensively. Al2 O3 based coatings showed poor adhesion and detached from the substrate after 250 hours. Abstract: Steam oxidation test was carried out at 800 °C for 2000 h on nine plasma sprayed coatings on gamma-prime (γ') strengthened Haynes ® 282 ® Ni-based alloy. The lowest oxidation kinetics and extensive reduction in internal oxidation process was observed in the sample coated with nano CeO2 with no bond coat. This is due to the oxygen deficiency in CeOx that facilitates the inward movement of oxygen arising from the presence of Ce 3+ oxidation state and ensures the quick formation of protective, impermeable and adherent layer of Cr2 O3 .