Corrosion behaviour of electropolished implant alloys

Norman Munroe, Waseem Haider, Amit Datye, Kuang His Wu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Most medical device alloys are electropolished prior to implantation and are immediately protected by the formation of passivating metal oxides. Nevertheless, tissue and fluid present in the human body presents a very corrosive environment to metals once implanted. This is exacerbated by the effects of strain, fatigue, abrasion or wear, which may rupture the passive film exposing the underlying metal. Cyclic potentiodynamic polarization studies were conducted to compare the corrosion resistance of Nitinol and stainless steel cardiovascular stents. In an attempt to simulate their corrosion behavior under body conditions, a Phosphate Buffered Saline (PBS) solution at 37 °C was employed utilizing the ASTM F2129-01, Item 2, WK1749, Standard [1]. The results of this study indicate that both materials exhibit high corrosion resistance in the PBS solution with stainless steel exhibiting slightly better corrosion resistance. However, electropolished nitinol stents appeared to have better corrosion resistance as compared to the unpolished ones.

Original languageEnglish
Title of host publicationSMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies
Pages307-314
Number of pages8
DOIs
StatePublished - 2008
EventInternational Conference on Shape Memory and Superelastic Technologies, SMST-2007 - Tsukuba, Japan
Duration: Dec 2 2007Dec 5 2007

Publication series

NameSMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies

Conference

ConferenceInternational Conference on Shape Memory and Superelastic Technologies, SMST-2007
Country/TerritoryJapan
CityTsukuba
Period12/2/0712/5/07

Keywords

  • Biocompatibility
  • Cardiovascular stents
  • Corrosion
  • Cyclic polarization
  • Nitinol
  • Pitting

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