Electrodeposition of Pt-Ir alloys on nickel-base single crystal superalloy TMS-75

Feng Wu, Hideyuki Murakami, Yoko Yamabe-Mitarai, Hiroshi Harada, Hideki Katayama, Yoshinobu Yamamoto

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Platinum-iridium alloy coatings from amidosulfuric acid solutions have successfully been electrodeposited on nickel-base single crystal superalloy TMS-75 by direct current method. The effects of electrolyte temperature, current density and mole concentration ratios of [Ir3+]/([PtCl62-]+ [Ir3+]), on the deposition rate, composition and crystallographic structures of Pt-Ir alloy coatings are investigated. It is found that with increasing electrolyte temperature, deposition rate and Ir content increase, whereas the grain size of Pt-Ir alloy coatings decreases. Smooth and dense Pt-Ir alloy coatings can be obtained at 1 A/dm2 and 353 K. Pt-Ir alloy coatings with expected compositions can be readily fabricated by controlling the mole concentration ratios of [Ir3+]/([PtCl62-] +[Ir3+]) in the electrolyte. A detailed investigation of the structure and morphology of electrodeposited Pt-Ir alloy coatings is also presented. XRD analysis revealed that all the coated Pt-Ir alloys have a single phase with f.c.c structure, and the lattice parameters of the coatings decrease linearly with increasing Ir content, suggesting that the coated Pt-Ir alloy system follows the Vegard's law.

Original languageEnglish
Pages (from-to)24-30
Number of pages7
JournalSurface and Coatings Technology
Volume184
Issue number1
DOIs
Publication statusPublished - 2004 Jun 1
Externally publishedYes

Keywords

  • Electrodeposition
  • Ni-base superalloy
  • Platinum-iridium alloy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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