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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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
Volume47
Issue number8
DOIs
Publication statusPublished - 2006 Aug 1
Externally publishedYes

Fingerprint

hot corrosion
Iridium
iridium
corrosion resistance
Corrosion resistance
Salts
salts
coatings
Coatings
aluminum coatings
heat resistant alloys
Platinum
Nickel
Superalloys
Magnetron sputtering
phase transformations
magnetron sputtering
platinum
Phase transitions
Single crystals

Keywords

  • Hot corrosion
  • Modified aluminide coatings
  • Platinum-iridium

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Role of iridium in hot corrosion resistance of Pt-Ir modified aluminide coatings with Na2so4-NaCl salt at 1173 K. / Wu, Ying Na; Yamaguchi, Akihiro; Murakami, Hideyuki; Kuroda, Seiji.

In: Materials Transactions, Vol. 47, No. 8, 01.08.2006, p. 1918-1921.

Research output: Contribution to journalArticle

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AU - Wu, Ying Na

AU - Yamaguchi, Akihiro

AU - Murakami, Hideyuki

AU - Kuroda, Seiji

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N2 - 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.

AB - 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.

KW - Hot corrosion

KW - Modified aluminide coatings

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