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Microtensile strain on the corrosion performance of diamond‐like carbon coating
Author(s) -
Lee SeungHwan,
Kim JungGu,
Choi HeonWoong,
Lee KwangRyeol
Publication year - 2007
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.31597
Subject(s) - materials science , corrosion , dielectric spectroscopy , scanning electron microscope , simulated body fluid , coating , composite material , polarization (electrochemistry) , delamination (geology) , diamond , chemical vapor deposition , diamond like carbon , substrate (aquarium) , electrolyte , ultimate tensile strength , electrochemistry , metallurgy , thin film , nanotechnology , electrode , paleontology , chemistry , oceanography , biology , geology , subduction , tectonics
Hydrogenated diamond‐like carbon films (a‐C:H DLC) were deposited on STS 304 substrates for the fabrication of vascular stents by means of the r.f. plasma‐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 DLC‐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 37°C. 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. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2008