title: Enhanced Corrosion Resistance of PVD-CrN Coatings by ALD Sealing Layers.
abstract: Multilayered hard coatings with a CrN matrix and an Al2O3, TiO2, or nanolaminate-Al2O3/TiO2sealing 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-Al2O3/TiO2sealing layers resulted in a further increase in corrosion resistance, which was attributed to the synergistic effect of Al2O3and TiO2, both acting as excellent passivation barriers to the diffusion of corrosive substances.
authors.affiliation: The Institute of Materials Technology, Pusan National University, Busan, 46241, South Korea.
authors.forename: Zhixin
authors.initials: Z
authors.lastname: Wan
authors.affiliation: National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan, 46241, South Korea.
authors.forename: Teng Fei
authors.initials: TF
authors.lastname: Zhang
authors.affiliation: School of Convergence Science, Pusan National University, Busan, 46241, South Korea.
authors.forename: Ji Cheng
authors.initials: JC
authors.lastname: Ding
authors.affiliation: School of Materials Science and Engineering, Pusan National University, Busan, 46241, South Korea.
authors.forename: Chang-Min
authors.initials: CM
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering, Pusan National University, Busan, 46241, South Korea.
authors.forename: So-Won
authors.initials: SW
authors.lastname: Park
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China. yangy@njtech.edu.cn.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan, 46241, South Korea. kwhokim@pusan.ac.kr.|School of Materials Science and Engineering, Pusan National University, Busan, 46241, South Korea. kwhokim@pusan.ac.kr.
authors.forename: Kwang-Ho
authors.initials: KH
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering, Pusan National University, Busan, 46241, South Korea. sehun@pusan.ac.kr.
authors.forename: Se-Hun
authors.initials: SH
authors.lastname: Kwon
keywords: ALD; Hybrid deposition process; Multilayered hard coating; PVD; Sealing layer