Passivation and Anodic Oxidation of Duplex TiN Coating on Stainless Steel
Open Access
- 1 November 1999
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 146 (11) , 4082-4086
- https://doi.org/10.1149/1.1392595
Abstract
The passivation and anodic oxidation of duplex TiN coatings deposited by arc ion plating onto prenitrided AISI 304 stainless steel have been studied by potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott‐Schottky measurements in . The chemical composition of the oxidized surface film atop TiN was analyzed by X‐ray photoelectron spectroscopy. Up to 1.2 V/SHE the TiN coating exhibits passive behavior, which is attributed to the formation of a film of nanometer thickness which grows linearly with anodic potential at a rate of 2.4 nm/V. Above 1.2 V/SHE enhanced anodicoxidation of TiN is observed at a rate of 17.7 nm/V, and the overall corrosion performance is governed both by the oxidized TiN coating and by a metallic Ti interlayer atop the nitrided stainless steel substrate. At all potentials the film is characterized by relatively high donor densities and is, furthermore, terminated by a hydroxylated surface. © 1999 The Electrochemical Society. All rights reserved.Keywords
This publication has 0 references indexed in Scilit: