Effect of Stress on the Passivation of Si-DLC Coating as Stent Materials in Simulated Body Environment

Title
Effect of Stress on the Passivation of Si-DLC Coating as Stent Materials in Simulated Body Environment
Authors
N. D. NamS. H. Lee김정구이진우이광렬
Keywords
DLC; Si-DLC; passivation of stent; Diamond-like carbon; Sputtering; Corrosion; Strain; Biomaterials
Issue Date
2009-07
Publisher
Diamond and related materials
Citation
VOL 18, 1145-1151
Abstract
DLC coating can be used for vascular stents to prevent the stainless steel substrate from eluting Ni and Cr by plastic deformation and corrosion environment. The stress corrosion cracking (SCC) of Si-diamond-like carbon (Si-DLC) coated on 316L stainless steel was studied in a simulated body environment of a deaerated 0.89 wt.% NaCl electrolyte at 37 °C. This paper investigated the effect of Si-DLC coating on the SCC of 316L SS by slow-strain-rate test (SSRT), constant load test (CLT), and electrochemical impedance spectroscopy (EIS). The EIS data were monitored for the elastic and plastic regions under CLT to determine the electrochemical behavior of the passive film during SCC phenomena. The Si-DLC coated steel exhibited more ductility than uncoated steel and less susceptibility to SCC in this environment. According to X-ray photoelectron spectroscopy (XPS) analysis, the film repassivation occurs due to the presence of the silicon oxide layer on the Si-DLC film surface.
URI
http://pubs.kist.re.kr/handle/201004/35561
ISSN
0925-9635
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE