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Factors influencing the aqueous electrochemical response of TiC–Ni3Al cermets

Published online by Cambridge University Press:  18 May 2017

Zhila Memarrashidi  and
Kevin P. Plucknett
Zhila Memarrashidi
Affiliation:
Materials Engineering Program, Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
Kevin P. Plucknett*
Affiliation:
Materials Engineering Program, Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The aqueous corrosion resistance of TiC–Ni3Al based cermets was examined with the specific aims of assessing the influence of both the raw materials and the test methods, using a 3.5 wt% NaCl containing solution. The effects of W contamination in the ceramic phase was investigated using a single-phase ceramic, with and without W, and with a stoichiometric intermetallic Ni3Al binder. The influence of the electrolyte O2 content was examined for TiC cermets with 30 vol% binder, for both the stoichiometric composition and sub-stoichiometric variants, containing either Zr and B (alloy IC50) or Zr, B and Cr (alloy IC221) additions. Electrochemical measurements were matched with chemical and microstructural analyses at various stages of oxidation, and the rate of material loss in combination with the corrosion mechanisms were identified. The effects of O2 concentration were most significant for the TiC based cermets with Ni3Al due to the diffusion controlled nature of the reaction.

Keywords

ceramiccompositecorrosion
Type
Invited Articles
Information
Journal of Materials Research , Volume 32 , Issue 17: Focus Issue: Achieving Superior Ceramics and Coating Properties through Innovative Processing , 14 September 2017 , pp. 3333 - 3343
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Xiaowei Yin

References

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