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Hot corrosion behavior of Pt-Ir modified aluminide coatings on the nickel-base single crystal superalloy TMS-82+

Published online by Cambridge University Press:  03 March 2011

Y.N. Wu ,
A. Yamaguchi ,
H. Murakami  and
S. Kuroda
Y.N. Wu*
Affiliation:
Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan
A. Yamaguchi
Affiliation:
Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan; and Graduate School of Engineering, Division of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan
H. Murakami
Affiliation:
Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan
S. Kuroda
Affiliation:
Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan
*
a) Address all correspondence to this author. e-mail: yingnawu@gmail.com
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Abstract

Platinum-iridium films (Ir = 0, 32, 46, 83, 100 at.%) were deposited on the nickel-base single crystal superalloy 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 Pt-Ir modified aluminide coatings with the different Ir contents were evaluated by exposure at 1173 K in the presence of the 90%Na2SO4 + 10%NaCl (wt%) salt deposits. The corrosion kinetics curves of the specimens were plotted up to 100 h heating time. The phase constitution, morphology of corrosion products, and element concentrations along the cross section were also measured. The lowest mass gain (0.299 mg/cm2, after 100 h) was observed for Pt-46Ir aluminide coating because the dense and continuous protective Al2O3 scale formed. Phase transformation from β-(Ni,Pt)Al to γ′-(Ni,Pt)3Al, characteristics of the scale, and protection by Pt/Ir enriched layer had the important effects on the hot corrosion behavior of modified aluminide coatings.

Keywords

CoatingCorrosionPt
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 1 , January 2007 , pp. 206 - 216
Copyright
Copyright © Materials Research Society 2007

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