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Microtensile strain on the corrosion performance of diamond-like carbon coating

โœ Scribed by Seung-Hwan Lee; Jung-Gu Kim; Heon-Woong Choi; Kwang-Ryeol Lee

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
344 KB
Volume
85A
Category
Article
ISSN
1549-3296

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โœฆ Synopsis

Abstract

Hydrogenated diamondโ€like carbon films (aโ€C:H DLC) were deposited on STS 304 substrates for the fabrication of vascular stents by means of the r.f. plasmaโ€assisted chemical vapor deposition technique. This study provides reliable and quantitative data for the assessment of the effect of strain on the corrosion performance of DLCโ€coated systems in the simulated body fluid obtained through electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy) and surface analysis (scanning electron microscopy). The electrolyte used in this test was 0.89% NaCl solution at pH 7.4 and 37ยฐC. It was found that the corrosion resistance of the plastically deformed DLC coating was insufficient for use as a protective film in a corrosive body environment. This is due to the increase in the delamination area and degradation of the substrate's corrosion properties with increasing tensile deformation. ยฉ 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2008

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