In vitro corrosion of titanium nitride and oxynitride-based biocompatible coatings deposited on stainless steel
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
MPDI
Abstract
The reactive cathodic arc deposition technique was used to produce Ti nitride and oxynitride
coatings on 304 stainless steel substrates (SS). Both mono (SS/TiN, SS/TiNO) and bilayer coatings
(SS/TiN/TiNO and SS/TiNO/TiN) were investigated in terms of elemental and phase composition,
microstructure, grain size, morphology, and roughness. The corrosion behavior in a solution consisting
of 0.10 M NaCl + 1.96 M H2O2 was evaluated, aiming for biomedical applications. The results showed
that the coatings were compact, homogeneously deposited on the substrate, and displaying rough
surfaces. The XRD analysis indicated that both mono and bilayer coatings showed only cubic phases
with (111) and (222) preferred orientations. The highest crystallinity was shown by the SS/TiN coating,
as indicated also by the largest grain size of 23.8 nm, which progressively decreased to 16.3 nm
for the SS/TiNO monolayer. The oxynitride layers exhibited the best in vitro corrosion resistance
either as a monolayer or as a top layer in the bilayer structure, making them a good candidate for
implant applications.
Description
Keywords
Titanium nitride, Oxynitride, Coating adhesion, Reactive cathodic arc deposition, Bilayer coatings
Citation
Pana, I. et al. (2020). In vitro corrosion of titanium nitride and oxynitride-based biocompatible coatings deposited on stainless steel. Coatings, 10(8), 710. https://doi.org/10.3390/coatings10080710