Role of Iridium in Hot Corrosion Resistance of Pt-Ir Modified Aluminide Coatings with Na<SUB>2</SUB>SO<SUB>4</SUB>-NaCl Salt at 1173 K

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  • Wu Ying-Na
    Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS)
  • Yamaguchi Akihiro
    Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS) Graduate School of Engineering, Division of Materials Science and Engineering, Shibaura Institute of Technology
  • Murakami Hideyuki
    Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS)
  • Kuroda Seiji
    Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS)

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  • Role of Iridium in Hot Corrosion Resistance of Pt-Ir Modified Aluminide Coatings with Na2SO4-NaCl Salt at 1173K

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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/m2, 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.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 47 (8), 1918-1921, 2006

    The Japan Institute of Metals and Materials

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