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Anti-corrosion characteristics of nitride-coated AISI 316L stainless steel coronary stents |
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| Authors: | C.L. Liu Paul K. Chu G.Q. Lin |
| Affiliation: | a Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue Kowloon, Hong Kong, China b Department of Materials and Engineering, State Key Laboratory for Material Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China |
| Abstract: | The corrosion resistance of TiN and TaN coatings deposited on AISI 316L stainless steel thread-coiled coronary stents by pulsed bias arc ion plating is evaluated by electrochemical methods in deaerated Tyrode's simulated body fluids (37 ± 1 °C). The free corrosion potential of the TaN-coated stents is found to be nobler than that of the TiN-coated and uncoated stents throughout most of the immersion time. The potentiodynamic polarization test results indicate that the TaN coatings offer better passivation stability and anti-breakdown performance. The longer-term 6-month immersion tests disclose slight localized corrosion on the surface of both coatings, but no film delamination or large area pitting can be observed indicating reasonably good corrosion resistance after the long period. |
| Keywords: | 87.68.+z Biomaterials and biological interfaces 81.15.Jj Ion plating 77.84.Bw Nitrides 81.65.Kn Corrosion protection |
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