Kim Jinwoo, Park Jun-Kyu, Kim Han Ki, Unnithan Afeesh Rajan, Kim Cheol Sang, Park Chan Hee
J Nanosci Nanotechnol. 2017 Apr;17(4):2333-339. doi: 10.1166/jnn.2017.13324.
Nitinol or NiTi alloys are well-known as an attractive biomedical material due to their unique properties such as the shape memory effect, super-elasticity and biocompatibility. These characteristics enable them to be best candidates for implant materials such as stent. One of the major factors that strongly affect the performance of nitinol stent is its unique surface properties. In this study, the influence of electropolishing on nitinol stents and its corrosion behavior were observed. Electropolishing is an effective method for surface treatment, which not only controls the surface state but also helps to produce uniform surface layers. Therefore, to improve the surface quality of nitinol stents, we conducted an electropolishing under various conditions from 30–40 V and 10–30 s as a post heat treatment for nitinol stent manufacturing process. In order to find the optimal surface state of NiTi stents, various electropolished samples were explored using various characterization techniques. Furthermore, the potentiodynamic polarization tests were also performed to determine the corrosion resistance. The electropolished nitinol stents under the condition of 40 V for 10 s exhibited the best corrosion performance as well as surface quality.
镍钛诺或镍钛合金因其独特性能（如形状记忆效应、超弹性和生物相容性）而作为一种有吸引力的生物医学材料广为人知。这些特性使其成为诸如支架等植入材料的最佳候选者。强烈影响镍钛诺支架性能的主要因素之一是其独特的表面性能。在本研究中，观察了电解抛光对镍钛诺支架的影响及其腐蚀行为。电解抛光是一种有效的表面处理方法，它不仅能控制表面状态，还有助于产生均匀的表面层。因此，为了提高镍钛诺支架的表面质量，我们在30 - 40 V和10 - 30 s的各种条件下进行电解抛光，作为镍钛诺支架制造工艺的后热处理。为了找到镍钛支架的最佳表面状态，使用各种表征技术对各种电解抛光样品进行了探索。此外，还进行了动电位极化测试以确定耐腐蚀性。在40 V下电解抛光10 s的镍钛诺支架表现出最佳的腐蚀性能和表面质量。
