Improved corrosion protection of CrN hard coating on steel sealed with TiOxNy-TiN composite layers

Based on the excellent conformality and uniformity of atomic layer deposition (ALD), ALD thin films can seal the defects in magnetron sputtered CrN coating. In this work, atomic layer deposited TiN layer is adopted to seal CrN to improve its anti-corrosion properties. The oxidization of TiN forms Ti...

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Bibliographic Details
Published in:Surface & coatings technology 2020-01, Vol.381, p.125108, Article 125108
Main Authors: Kong, Ji-Zhou, Xu, Peng, Cao, Yan-Qiang, Li, Ai-Dong, Wang, Qian-Zhi, Zhou, Fei
Format: Article
Language:English
Subjects:
Atomic layer deposition
Atomic layer epitaxy
Charge transport
Chlorine
Corrosion
Corrosion currents
Corrosion effects
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
CrN hard coating
Diffusion layers
Hard surfacing
Oxidization
Protective coatings
Sealing
Synergistic effect
Thin films
TiN coating
TiOxNy-TiN sealing layer
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Summary:Based on the excellent conformality and uniformity of atomic layer deposition (ALD), ALD thin films can seal the defects in magnetron sputtered CrN coating. In this work, atomic layer deposited TiN layer is adopted to seal CrN to improve its anti-corrosion properties. The oxidization of TiN forms TiOxNy-TiN composite layer including TiN bottom layer and TiOxNy upper layer, which can limit the charge transport, inhibit the diffusion of corrosive media, such as chlorine ions. Therefore, the addition of TiOxNy-TiN sealing layer significantly improves the corrosion resistance of CrN coated steel, and decreases its corrosion current density, due to the synergistic effect of TiOxNy and TiN in the composite sealing layer. •Atomic layer deposited TiN is used to seal the sputtered CrN hard coating.•The oxidization of TiN layer results in the TiOxNy–TiN composite sealing layer.•Anti-corrosion properties of CrN are improved by the composite sealing layer.•It's due to the synergistic effect of TiOxNy upper layer and TiN bottom layer.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2019.125108