The roles of diffusion factors in electrochemical corrosion of TiN and CrN (CrSiCN) coated mild steel and stainless steel

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Proceedings titleTMS 2012, 141st Annual Meeting & Exhibition, Supplemental Proceedings. Volume 1, Materials Processing and Interfaces
ConferenceTMS 2012: 141st Annual Meeting and Exhibition, March 11-15, 2012, Orlando, FL, USA
Pages4956; # of pages: 8
SubjectPVD coating, coating defect, corrosion, electrochemical impedance, EIS
AbstractApplying noble coatings on steel components is an effective solution to preventing corrosion attacks. However, through-coating defects, such as pin holes, voids and growth defects play a detrimental role in the degradation of a coating-substrate system. Through the defects, corrosive media are able to reach the metal substrate, initializing pitting corrosion and eventually resulting in coating failure. This research studies the correlation between coating defects and corrosion behavior of the TiN and CrN (CrSiCN) coated mild steel and stainless steel. Electrochemical impedance technique is used to reveal the corrosion behavior. The results revealed that in a coating-substrate system, two critical factors controlling the corrosion resistance, the effective diffusion coefficient and diffusion layer thickness, which are found to be related to coating microstructure. Denser and thicker coating structures result in lower effective diffusion coefficients and greater effective diffusion layer thickness, and demonstrate high electrochemical impedance and resistance to electrochemical corrosion.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Aerospace Research
Peer reviewedYes
NPARC number21270207
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Record identifierc78a985d-14c3-4652-a634-72413f07173e
Record created2014-01-10
Record modified2016-05-09
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