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- Title
Enhanced Corrosion Resistance of PVD-CrN Coatings by ALD Sealing Layers.
- Authors
Wan; Zhang, Teng Fei; Ding, Ji; Kim, Chang-Min; Park, So-Won; Yang, Yang; Kim, Kwang-Ho; Kwon, Se-Hun
- Abstract
Multilayered hard coatings with a CrN matrix and an AlO, TiO, or nanolaminate-AlO/TiO sealing layer were designed by a hybrid deposition process combined with physical vapor deposition (PVD) and atomic layer deposition (ALD). The strategy was to utilize ALD thin films as pinhole-free barriers to seal the intrinsic defects to protect the CrN matrix. The influences of the different sealing layers added in the coatings on the microstructure, surface roughness, and corrosion behaviors were investigated. The results indicated that the sealing layer added by ALD significantly decreased the average grain size and improved the corrosion resistance of the CrN coatings. The insertion of the nanolaminate-AlO/TiO sealing layers resulted in a further increase in corrosion resistance, which was attributed to the synergistic effect of AlO and TiO, both acting as excellent passivation barriers to the diffusion of corrosive substances.
- Subjects
CHROMIUM compounds; CORROSION resistance; PHYSICAL vapor deposition; SURFACE coatings; ATOMIC layer deposition; SEALING (Technology)
- Publication
Nanoscale Research Letters, 2017, Vol 12, Issue 1, p1
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1186/s11671-017-2020-1