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/TiO2 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-Al2O3/TiO2 sealing layers resulted in a further increase in corrosion resistance, which was attributed to the synergistic effect of Al2O3 and TiO2, both acting as excellent passivation barriers to the diffusion of corrosive substances.

Erratum to: Enhanced Corrosion Resistance of PVD-CrN Coatings by ALD Sealing Layers

“…The name of the author [Zhixin Wan] was not completely displayed in the original publication [ 1 ]. The original article has been updated to rectify this error.…”

The Influence of Laser Modification on a Composite Substrate and the Resistance of Thin Layers Created Using the PVD Process

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“…Tailoring the coatings properties to specific purposes requires understanding of their microstructure, topography and mechanical properties but also the interrelationship between these properties. The coatings topography is important for their tribological and corrosion behavior [1,2], while coating microstructure (grain morphology) governs their mechanical properties, fracture behavior, and their tribological performance [3]. Besides the initial substrate roughness, the coatings topography greatly depends on the kind of applied deposition process, employed parameters, and the type of substrate material.…”

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