Role of iridium in hot corrosion resistance of Pt-Ir modified aluminide coatings with Na2so4-NaCl salt at 1173 K

Ying Na Wu, Akihiro Yamaguchi, Hideyuki Murakami, Seiji Kuroda

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Platinum-iridium films (Ir = 0,32,46,83,100 at%) were deposited on the nickel-base single crystal superalloy TMS-82+ 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 the different Pt-Ir modified aluminide coatings was evaluated through exposure at 1173 K with the Na2SO4+10 mass%NaCl salt coatings. The lowest mass gain (2.99 × 10-3 kg/m 2, after 100 h) was observed for the Pt-46Ir aluminide coating, which formed the dense and continuous protective Al2O3 scale on the surface. The effect of Ir on the corrosion resistance of Pt-Ir modified aluminide coatings was discussed from three aspects - phase transformation, protective scale formation and the role of a Pt-Ir enriched layer.

Original languageEnglish
Pages (from-to)1918-1921
Number of pages4
JournalMaterials Transactions
Issue number8
Publication statusPublished - 2006 Aug 1



  • Hot corrosion
  • Modified aluminide coatings
  • Platinum-iridium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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