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)
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- 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
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- Murakami Hideyuki
- Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS)
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- Kuroda Seiji
- Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS)
Bibliographic Information
- Other Title
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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
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 47 (8), 1918-1921, 2006
The Japan Institute of Metals and Materials
