MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Characterization of Electroplated Platinum–Iridium Alloys on the Nickel-Base Single Crystal Superalloy
Yingna WuAya SuzukiHideyuki MurakamiSeiji Kuroda
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2005 Volume 46 Issue 10 Pages 2176-2179

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Abstract

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.

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© 2005 The Japan Institute of Metals and Materials
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