Designing new biocompatible glass-forming Ti<inf>75-</inf><inf>x</inf>Zr<inf>10</inf>Nb<inf>x</inf>Si<inf>15</inf> (x = 0, 15) alloys: Corrosion, passivity, and apatite formation

Somayeh Abdi, Steffen Oswald, Petre Flaviu Gostin, Arne Helth, Jordi Sort, Maria Dolors Barõ, Mariana Calin, Ludwig Schultz, Jürgen Eckert, Annett Gebert

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

© 2015 Wiley Periodicals, Inc. Glass-forming Ti-based alloys are considered as potential new materials for implant applications. Ti75Zr10Si15 and Ti60Zr10Nb15Si15 alloys (free of cytotoxic elements) can be produced as melt-spun ribbons with glassy matrix and embedded single β-type nanocrystals. The corrosion and passivation behavior of these alloys in their homogenized melt-spun states have been investigated in Ringer solution at 37°C in comparison to their cast multiphase crystalline counterparts and to cp-Ti and β-type Ti-40Nb. All tested materials showed very low corrosion rates as expressed in corrosion current densities icorr < 50 nA/cm2. Electrochemical and surface analytical studies revealed a high stability of the new alloys passive states in a wide potential range. This corresponds to low passive current densities ipass = 2 ± 1 μA/cm2 based on the growth of oxide films with thickness d <10 nm. A homogeneous constituent distribution in the melt-spun alloys is beneficial for stable surface passivity. The addition of Nb does not only improve the glass-forming ability and the mechanical properties but also supports a high pitting resistance even at extreme anodic polarization up to 4V versus SCE were oxide thickness values of d ∼35 nm are reached. With regard to the corrosion properties, the Nb-containing nearly single-phase glassy alloy can compete with the β-type Ti-40Nb alloy. SBF tests confirmed the ability for formation of hydroxyapatite on the melt-spun alloy surfaces. All these properties recommend the new glass-forming alloys for application as wear- and corrosion-resistant coating materials for implants.
Original languageEnglish
Pages (from-to)27-38
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume104
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Auger electron spectroscopy
  • Ringer solution
  • Ti alloy
  • X-ray photoelectron spectroscopy
  • corrosion
  • implant
  • metallic glass

Fingerprint Dive into the research topics of 'Designing new biocompatible glass-forming Ti<inf>75-</inf><inf>x</inf>Zr<inf>10</inf>Nb<inf>x</inf>Si<inf>15</inf> (x = 0, 15) alloys: Corrosion, passivity, and apatite formation'. Together they form a unique fingerprint.

Cite this