Microtensile strain on the corrosion performance of diamond-like carbon coating.
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 degrees 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.
Lee
Seung-Hwan
SH
Department of Advanced Materials Engineering, Sungkyunkwan University, 300 Chunchun-Dong, Jangan-Gu, Suwon 440-746, Korea.
Kim
Jung-Gu
JG
Choi
Heon-Woong
HW
Lee
Kwang-Ryeol
KR
D002244:Carbon; D020099:Coated Materials, Biocompatible; D003343:Corrosion; D018130:Diamond; D008422:Materials Testing; D008954:Models, Biological; D015607:Stents; D013718:Tensile Strength
D020099:Coated Materials, Biocompatible; D002244:Carbon; D018130:Diamond