Effects of tungsten pre-implanted layer on corrosion and electrochemical characteristics of amorphous carbon films on stainless steel

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Detail(s)

Original languageEnglish
Pages (from-to)1738-1742
Journal / PublicationDiamond and Related Materials
Volume17
Issue number7-10
Publication statusPublished - Jul 2008

Abstract

Amorphous carbon (a-C) films have been deposited on untreated and W pre-implanted (20 kV, 3 × 1017 ions/cm2) stainless steel substrates by plasma immersion ion implantation and deposition (PIII&D). X-ray photoelectron spectroscopy indicates that the transition layer consists of tungsten carbide (WC) and C. The corrosion behavior of the coatings is investigated electrochemically in 37 ± 1 °C simulated body fluids. In comparison with the a-C films, the a-C films with a W pre-implanted layer exhibit more positive open-circuit potentials, lower corrosion current density, and higher protection efficiency as indicated by potentiodynamic polarization tests. Electrochemical impedance spectroscopy reveals that the W pre-implantation layer increases the corrosion resistance of the a-C coatings in test solutions. The continuous structure caused by W pre-implantation layer is believed to not only offer good adhesion between the a-C film and steel substrate but also act as a barrier to mitigate penetration of water molecules and ions. © 2008 Elsevier B.V. All rights reserved.

Research Area(s)

  • 52.77.Dq, 81.05.Uw, 81.65.Kn, Amorphous carbon films, Carbon, diamond, graphite, Corrosion, Corrosion protection, Plasma-based ion implantation and deposition in physics of plasmas, Stainless steel, Tungsten implantation

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