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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.10 (2005)  >  pp.2176-2179

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Characterization of Electroplated Platinum–Iridium Alloys on the Nickel-Base Single Crystal Superalloy

Yingna Wu1), Aya Suzuki1), Hideyuki Murakami1) and Seiji Kuroda1)
1) Thermal Spray Group, Materials Engineering Laboratory, National Institute for Materials Science (NIMS)

As a high temperature protective layer, platinum–iridium alloys were electroplated on the nickel-base single crystal superalloy TMS-82+ from amidosulfuric acid solutions by the direct current method. It was found that Ir content in the films was always lower than the ratio of concentration ([Ir3+]/([PtCl62−] + [Ir3+])) in the electrolytes, indicating that preferential deposition of Pt occurred in this study. The as-deposited Pt–Ir films formed an fcc single phase structure with a granular surface. When Ir content exceeded 3 at%, Pt–Ir films exhibited the ⟨111⟩ preferred growth orientation. It was also found that pre-deposition of Ni and Pt promoted the deposition rate and changed composition of overlaying Pt–Ir films.

electroplating, direct current method, platinum–iridium films, pre-deposition, Ni-base superalloy

Received: April 26, 2005
Accepted: August 01, 2005 , Published online: November 14, 2005
Copyright (c) 2005 The Japan Institute of Metals



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