TY - JOUR
T1 - Effects of tungsten pre-implanted layer on corrosion and electrochemical characteristics of amorphous carbon films on stainless steel
AU - Liu, Chenglong
AU - Xu, Ming
AU - Zhang, Wei
AU - Pu, Shihao
AU - Chu, Paul K.
PY - 2008/7
Y1 - 2008/7
N2 - 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.
AB - 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.
KW - 52.77.Dq
KW - 81.05.Uw
KW - 81.65.Kn
KW - Amorphous carbon films
KW - Carbon, diamond, graphite
KW - Corrosion
KW - Corrosion protection
KW - Plasma-based ion implantation and deposition in physics of plasmas
KW - Stainless steel
KW - Tungsten implantation
UR - http://www.scopus.com/inward/record.url?scp=48849109190&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-48849109190&origin=recordpage
U2 - 10.1016/j.diamond.2008.01.114
DO - 10.1016/j.diamond.2008.01.114
M3 - RGC 21 - Publication in refereed journal
SN - 0925-9635
VL - 17
SP - 1738
EP - 1742
JO - Diamond and Related Materials
JF - Diamond and Related Materials
IS - 7-10
ER -