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

机译:Ti-O膜修饰的316L不锈钢冠状动脉支架的体外耐蚀性

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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℃). 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.
机译:本文探讨了改善使用Ti-O膜改性的支架的耐腐蚀性。通过金属真空电弧源沉积技术在316L不锈钢(SS)支架表面生长各种厚度的Ti-O膜,并通过微x射线研究其相组成,厚度和膜与物质之间的粘附力衍射(Micro-XRD),表面轮廓仪和扫描电子显微镜(SEM)。在磷酸盐缓冲液(37±1℃)中通过极化试验评估了改性支架的耐腐蚀性。结果表明,Ti-O膜非常光滑且均匀。血管成形术扩张后没有任何裂纹和分层,Ti-O膜与支架之间的附着力令人满意。 Ti-O膜修饰支架的开路电位(OCP)高于裸支架。表明改性支架的电化学稳定性优于裸支架。极化测试结果表明,Ti-O薄膜支架的钝化稳定性和抗击穿性能均优于裸支架,两种改性支架的表面均未观察到点蚀现象,但在支架表面发现了局部的薄膜条纹。较厚的膜厚,表明具有一定厚度的Ti-O膜支架具有良好的耐蚀性。

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