Corrosion protection of steel with multilayer coatings: Improving the sealing properties of physical vapor deposition CrN coatings with Al2O3/ TiO2 atomic layer deposition nanolaminates

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Abstract

Atomic Layer Deposition (ALD) of Al2O3/TiO2 nanolaminatewas applied to improve the sealing properties of CrN coating deposited with Physical Vapor Deposition (PVD) on high speed steel (HSS). The corrosion protection propertieswere explored with Linear Sweep Voltammetry and visual estimation. Nearly two orders of magnitude decrease in corrosion current density was obtained by applying plasma pre-treatment prior to ALD coating. Sealing of CrN pinholes was shown with Focused Ion Beam/Scanning Electron Microscope technique. The effect of the ALD deposition parameters to adhesion of the ALD coatings was investigated with Rockwell indentation and microscope analysis. Thickness and refractive index of the ALD coatings were measured with ellipsometry, and density and roughness of the ALD coatingswere investigatedwith X-Ray Reflectivity measurements. Neutral Salt Spray testing was used to investigate the corrosion resistance of PVD/ALD nanolaminates on HSS dental curettes.

Details

Original languageEnglish
Pages (from-to)59-68
Number of pages10
JournalThin Solid Films
Volume627
Early online date24 Feb 2017
Publication statusPublished - Apr 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • CORROSION, defects, Electrochemical properties, Multilayer, Physical vapor deposition, Atomic layer Deposition, Thin films, STEEL

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