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Adhesion, microstrain, and corrosion behavior of ZrN-coated AZ91 alloy as a function of temperature

Published online by Cambridge University Press:  24 September 2013

Seyed Rahim Kiahosseini
Affiliation:
Materials Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran, 1477893855
Abdollah Afshar
Affiliation:
Materials Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran, 1477893855
Majid Mojtahedzadeh Larijani*
Affiliation:
Agriculture Medical and Industrial Research School, Nuclear Science and Technology Research Institute (NSTRI), Karaj, Iran
Mardali Yousefpour
Affiliation:
Materials Science and Engineering Department, University of Semnan, Semnan, Iran
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, nanocrystalline ZrN films were successfully deposited onto AZ91 alloy using an ion beam sputtering method at substrate temperatures of 373–673 K. Strain and adhesion were calculated using the classic Williamson–Hall and indentation cracking methods, respectively. Microstructure and crystalline properties were evaluated using scanning electron microscopy and x-ray diffraction. XRD results showed that the crystallographic properties of the films were strongly dependent upon substrate temperature. An increase in temperature increased adhesion of the film to the AZ91 alloy and decreased film microstrain. The corrosion behavior of ZrN/AZ91 samples in Ringer's solution was studied to evaluate corrosion potential and corrosion current density. Potentiodynamic corrosion tests showed that all ZrN-coated samples had a corrosion resistance superior to the blank substrate, mainly at 400 °C. A correlation was also established between vacancy defects in the film and corrosion behavior.

Type
Articles
Copyright
Copyright © Materials Research Society 2013 

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References

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