Electrochemical behaviours of titanium nitride (TIN) and chromium nitride (CRN) based pvd coating systems

DOIResolve DOI: http://doi.org/10.1115/GT2013-94024
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Proceedings titleProceedings of the ASME Turbo Expo
ConferenceASME Turbo Expo 2013: Turbine Technical Conference and Exposition, GT 2013, 3 June 2013 through 7 June 2013, San Antonio, Tx
Volume5:00 AM
SubjectCoating microstructures; Coating-substrate systems; Diffusion layer thickness; Effective diffusion coefficients; EIS; Electrochemical behaviour; NaCl aqueous solution; PVD coatings; Corrosion; Corrosion resistance; Defects; Diffusion; Diffusion coatings; Electrochemical impedance spectroscopy; Exhibitions; Gas turbines; Hard coatings; Pitting; Potentiodynamic polarization; Titanium nitride; Electrochemical corrosion
AbstractHard coatings applied to steel components prevent corrosion attacks while at the same time mitigate erosion attack. However, the presence of process related through-coating defects such as pin holes, voids and growth defects, provides accesses for corrosive media to metal substrates, initializing pitting corrosion and eventually resulting in coating failure. This research studies the corrosion behavior of PVD TiN and CrN (CrSiCN) coated steels in 3.5 wt. % NaCl aqueous solution using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results revealed that in a coating-substrate system, effective diffusion coefficient and diffusion layer thickness control the corrosion resistance; both factors are found to be related to coating microstructure. A denser and thicker coating structure are shown to have lower effective diffusion coefficients and greater effective diffusion layer thicknesses and consequently provided a high resistance to electrochemical corrosion. Copyright © 2013 by ASME.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21270934
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Record identifier09dc585a-56a1-46ca-bfe0-2dfe571b7da1
Record created2014-02-18
Record modified2016-05-09
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