Hot corrosion behavior of Pt-Ir modified aluminide coatings on the nickel-base single crystal superalloy TMS-82+

Ying Na Wu, A. Yamaguchi, Hideyuki Murakami, S. Kuroda

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Platinum-iridium films (Ir = 0, 32, 46, 83, 100 at.%) were deposited on the nickel-base single crystal superalloy through magnetron sputtering. After annealing and aluminizing, the Pt-Ir modified aluminide coatings mainly consisted of PtAl2 and β-(Ni,Pt,Ir)Al phases. Hot corrosion resistance of Pt-Ir modified aluminide coatings with the different Ir contents were evaluated by exposure at 1173 K in the presence of the 90%Na2SO4 + 10%NaCl (wt%) salt deposits. The corrosion kinetics curves of the specimens were plotted up to 100 h heating time. The phase constitution, morphology of corrosion products, and element concentrations along the cross section were also measured. The lowest mass gain (0.299 mg/cm2, after 100 h) was observed for Pt-46Ir aluminide coating because the dense and continuous protective Al2O3 scale formed. Phase transformation from β-(Ni,Pt)Al to γ′- (Ni,Pt)3Al, characteristics of the scale, and protection by P t/Ir enriched layer had the important effects on the hot corrosion behavior of modified aluminide coatings.

Original languageEnglish
Pages (from-to)206-216
Number of pages11
JournalJournal of Materials Research
Issue number1
Publication statusPublished - 2007 Jan 1
Externally publishedYes


ASJC Scopus subject areas

  • Materials Science(all)

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