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Metals 2017, 7(7), 231; doi:10.3390/met7070231

Electrochemical Behaviour of PACVD TiN-Coated CoCrMo Medical Alloy

1
Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10002 Zagreb, Croatia
2
Department of Welded Structures, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10002 Zagreb, Croatia
3
Department of Electrochemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulic Square 19, 10002 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Received: 27 April 2017 / Revised: 14 June 2017 / Accepted: 20 June 2017 / Published: 23 June 2017
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Abstract

CoCrMo alloys have been used in hip replacements for many years, and their properties can be enhanced with hard coatings. The TiN layer can be deposited on a CoCrMo alloy to its improve corrosion properties, such as reduction of the release of potentially harmful metal ions from CoCrMo-based surgical implants. In this work, a medical grade CoCrMo alloy was coated with TiN by means of plasma-assisted chemical deposition from the vapor phase (PACVD) technique at 500 °C for 4.5 h. The TiN/substrate interface and thickness of the TiN layer were analysed by scanning electron microscopy (SEM). Corrosion parameters Ecor, Rp, and Icor were determined via direct current (DC) and alternating current (AC) electrochemical techniques. The SEM analysis showed a highly dense and quite uniform TiN layer, with a thickness of 2 µm. The results obtained by the DC electrochemical methods show better corrosion stability of the TiN/CoCrMo samples in comparison with CoCrMo in 0.9% NaCl at (25 ± 1) °C and (36 ± 1) °C. The electrochemical impedance spectroscopy (EIS) results show that there are nuclei on the TiN coating which reduce the corrosion stability. View Full-Text
Keywords: cobalt-chromium alloy; TiN; PACVD; electrochemical testing; scanning electron microscopy cobalt-chromium alloy; TiN; PACVD; electrochemical testing; scanning electron microscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jakovljević, S.; Alar, V.; Ivanković, A. Electrochemical Behaviour of PACVD TiN-Coated CoCrMo Medical Alloy. Metals 2017, 7, 231.

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