Electrolytic Polishing of Nitinol Based Cardiovascular Stent in NaCl-Ethylene Glycol-Ethanol-Water Electrolyte

Nitinol (nickel titanium alloy) is well-known as one of the best biocompatible alloys because of its excellent performance. One of the main factors affecting the performance of nitinol cardiovascular stent is their unique surface properties. To improve the surface integrity of these stents, this pap...

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Bibliographic Details
Published in:International journal of electrochemical science 2020-09, Vol.15 (9), p.8823-8836
Main Authors: Wang, Yongqi, Wei, Xiuting, Li, Zhiyong, Sun, Xiaoyu, Liu, Hanqing, Jing, Xuemin, Gong, Zhikang
Format: Article
Language:English
Subjects:
Cardiovascular stent
Electrolytic polishing
Nitinol
Roughness
XPS
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Summary:Nitinol (nickel titanium alloy) is well-known as one of the best biocompatible alloys because of its excellent performance. One of the main factors affecting the performance of nitinol cardiovascular stent is their unique surface properties. To improve the surface integrity of these stents, this paper presented an electrolytic polishing method that added ethanol of different concentrations into a glycol - sodium chloride electrolyte to find the optimal electrolyte composition. This paper also investigated the change in surface chemical composition. By plotting the voltage-current density curve and the time-current density curve at various anhydrous ethanol concentrations, the optimal polishing voltage and anhydrous ethanol concentration were determined to be 16 volts and 30%, respectively. According to the time-current density curve, the optimal polishing time was determined to be 20 min, when obtaining the minimum surface roughness (Ra1.837 nm). Furthermore, the surface composition and formation mechanism of the stent after electrolytic polishing were analysed by XPS.
ISSN:1452-3981
1452-3981
DOI:10.20964/2020.09.01