Corrosion Resistance of Ti-O Film Modified 316L Stainless Steel Coronary Stents In Vitro

Abstract

This article dealt with improving corrosion resistance of stent modified using Ti-O film. Ti-O films of various thicknesses were grown on the surface of 316L stainless steel (SS) stents by metal vacuum arc source deposition technology, and the phase composition, the thickness and the adhesion between films and substance were investigated by micro-x-ray diffraction (Micro-XRD), surface profilometer, and scanning electron microscopy (SEM) separately. The corrosion resistance of modified stent was assessed by polarization test in phosphate buffered solution (37 ± 1°C). The result shows that the Ti-O films were very smooth and uniform. There were not any cracks and delaminations after dilation by angioplasty, the adhesion between Ti-O film and stent is satisfactory. The open circuit potential (OCP) of the Ti-O film modified stents was higher than that of the bare stents; it shows that the electrochemical stability of modified stents was more than bare stents. The polarization test result indicates that the passivation stability and anti-breakdown performance of Ti-O film stents had better than bare stents, and no pitting was observed on the surface of both modified stents, but the local film striations were found on the stent surface of the thicker film, which indicated that the Ti-O film stents with certain thickness has good corrosion resistance.

Evaluation of the protective nature of GO–BCP nanocomposite coatings on 316L SS in artificial body fluid

“…[1][2][3] However, the release of redundant metal ions such as Cr, Fe, and Ni after long-term implantation of 316L SS into the human body causes blood coagulation and blood vessels restenosis by chronic inflammation. 6 Apart from these critical issues, implantation risk may also occur due to corrosion. In order to tackle this problem, metal surface modification was suggested to de-escalate the ionic contact between blood plasma and the metal surface.…”

Enhancement of the Pitting Corrosion Resistance of AISI 316LVM Steel with Ta-Hf-C/Au Bilayers for Biomedical Applications

“…The authors showed that the coated steel presented high resistance to pitting and crevice corrosion, besides good biocompatibility. On the other hand, Liu et al [29] have shown that 316LVM steel stents coated with TiO 2 layers presented better passivation stability and antibreakdown performance than bare stents in a phosphate buffered solution. In general, the surface modification of the 316LVM stainless steel seems to be one of the solutions to improve its corrosion resistance in physiological conditions in order to be used as human implants [30,31].…”

Impact of Sterilisation and Strain Hardening in Drawing Process on Resistance to Electrochemical Corrosion of Wires Intended in Cardiology

“…In invasive cardiologic treatment, guide wires and cardiologic implants are generally made of wires and wire products made of stainless steel [1][2][3][4][5][6][7][8]. They should feature proper biotolerance, and what follows -high resistance to electrochemical corrosion in contact with blood.…”