TY - JOUR
T1 - Electrodeposition of Pt-Ir alloys on nickel-base single crystal superalloy TMS-75
AU - Wu, Feng
AU - Murakami, Hideyuki
AU - Yamabe-Mitarai, Yoko
AU - Harada, Hiroshi
AU - Katayama, Hideki
AU - Yamamoto, Yoshinobu
N1 - Funding Information:
This work was carried out under the auspices of High Temperature Materials 21 Project, NIMS and partly supported by the Industrial Technology Research Grant Program, New Energy and Industrial Technology Development Organization (NEDO). The authors also wish to thank Mr T. Yokokawa and Dr P. Kuppusami for experimental assistance.
PY - 2004/6/1
Y1 - 2004/6/1
N2 - 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.
AB - 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.
KW - Electrodeposition
KW - Ni-base superalloy
KW - Platinum-iridium alloy
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U2 - 10.1016/j.surfcoat.2003.10.051
DO - 10.1016/j.surfcoat.2003.10.051
M3 - Article
AN - SCOPUS:2642568415
SN - 0257-8972
VL - 184
SP - 24
EP - 30
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 1
ER -