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Corrosion protective double layer hard coatings

  • N. Afshari and A. J. Novinrooz
Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 12

Abstract

A Cr + TiN double layer was coated on an SS-420 substrate using a hollow cathode discharge gun. The compositional analysis of the samples carried out by glow discharge optical emission spectroscopy confirmed the Cr/TiN constituents. X-ray diffraction pattern studies showed that due to the presence of chromium in the TiN matrix, preferential growth of TiN was changed from (200) to (111) reflection plane, leading to formation of a Cr + TiN double layer hard composite. However, at the same time, the hard coating layers exhibited unavoidable defects exposing them to corrosive environments. In this work, the corrosion protective behaviour of the Cr + TiN double layer was examined by potentiodynamic measurements in sodium chloride solution. It was inferred from this study that the increase in corrosion potential from −505 mV to −452 mV corresponding to the bare substrate and Cr + TiN coatings, respectively, led to the formation of more corrosion protective layers. The electrochemical impedance spectra analysis of the SS-420 substrate, TiN and Cr + TiN layers revealed that corrosion resistance increased and the electrochemical impedance of the Cr + TiN layer decreased. This is attributed to the corrosion protective properties of the resultant coating and its reduced permeability to the corrosive environment.

Keywords: Cr + TiN; Double layer; Thin films; Hard coatings; Corrosion resistance
∗ Correspondence address, A.J. Novinrooz, Materials Research School, NRCAM, P.O. Box 31485-498, Karaj, Iran, Tel.: +98261 4411100, Fax: +98261 4464056. E-mail:

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Received: 2008-4-6
Accepted: 2008-8-29
Published Online: 2013-05-18
Published in Print: 2008-12-01

© 2008, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101778
Keywords for this article
Cr + TiN; Double layer; Thin films; Hard coatings; Corrosion resistance

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Editorial December 2008
  5. Basic
  6. Thermodynamic description of the C-Fe-Mn system with key experiments and its practical applications
  7. A study of phase equilibria in the Al-rich part of the Al-Mn alloy system
  8. Transient dopant segregation and precipitation in yttrium-doped alumina
  9. Experimental study on gallium activity in the liquid Ga-Bi-Sn alloys using the EMF method with zirconia solid electrolyte
  10. Modeling of the hot deformation behavior of boron microalloyed steels under uniaxial hot-compression conditions
  11. A new kinetic treatment of the oxidation of β-SiAlON powder
  12. Quantification of ∊-martensite after thermocycling in Fe-(17∼25)Mn alloys
  13. The effect of pre-structure process on magnetorheological elastomer performance
  14. Applied
  15. Corrosion protective double layer hard coatings
  16. Interpretation of inorganic melts' surface properties on the basis of chemical status and structural relations
  17. Basic
  18. Achieving ultra-fine grains in AZ61 Mg alloy by friction stir processing
  19. The combined effect of titanic carbide and aluminum phosphide on the refinement of primary silicon in Al-50Si alloy
  20. Applied
  21. The role of solidification conditions on the microstructural features of AA6111 aluminum strips cast on a horizontal single belt caster
  22. Far infrared spectroscopy of Pb0.85Sn0.15Te alloy doped with Ni
  23. DGM News
  24. DGM News
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