Mechanical and electrochemical properties of nanocrystalline (Mo ₁₋ₓCrₓ)₃Si coatings: Experimental and modeling studies
Date
2014
Authors
Xu, J.
Li, Z.
Lu, X.
Yan, Y.
Munroe, P.
Xie, Z.
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Journal article
Citation
Journal of Alloys and Compounds, 2014; 611:179-190
Statement of Responsibility
Jiang Xu, ZhengYang Li, Xiaolin Lu, Yong Yan, Paul Munroe, Zong-Han Xie
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Abstract
Four (Mo<inf>1-x</inf>Cr<inf>x</inf>)<inf>3</inf>Si nanocrystalline coatings with a cubic A15 structure were fabricated onto Ti-6Al-4V substrates using a double-cathode glow discharge technique. The elastic modulus and hardness of the nanocrystalline (Mo<inf>1-</inf> <inf>x</inf>Cr<inf>x</inf>)<inf>3</inf>Si coatings were measured by nanoindentation and their electrochemical behavior was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 3.5 wt% NaCl solution. The results showed that the corrosion and abrasion damage resistance of the nanocrystalline (Mo<inf>1-x</inf>Cr <inf>x</inf>)<inf>3</inf>Si coatings increased with increasing Cr addition. To gain a deeper understanding of the effect of Cr alloying on the electrochemical behavior of these (Mo<inf>1-x</inf>Cr<inf>x</inf>)<inf>3</inf>Si coatings, the electronic structure and Mulliken populations were modeled by first-principles calculations. It revealed that the Cr alloying can enhance the protective nature of passive layers developed on the Mo<inf>3</inf>Si coatings. The findings provide a promising foundation for the development of mechanically robust, corrosion-resistant Mo<inf>3</inf>Si-based coatings for surface protection. © 2014 Elsevier B.V. All rights reserved.
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© 2014 Elsevier B.V. All rights reserved.