title: Designing new biocompatible glass-forming Ti75-x Zr10 Nbx Si15 (x = 0, 15) alloys: corrosion, passivity, and apatite formation.
abstract: Glass-forming Ti-based alloys are considered as potential new materials for implant applications. Ti75 Zr10 Si15 and Ti60 Zr10 Nb15 Si15 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/cm(2). 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/cm(2) 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.
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, D-01062, Dresden, Germany.
authors.forename: Somayeh
authors.initials: S
authors.lastname: Abdi
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.
authors.forename: Steffen
authors.initials: S
authors.lastname: Oswald
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.
authors.forename: Petre Flaviu
authors.initials: PF
authors.lastname: Gostin
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, D-01062, Dresden, Germany.
authors.forename: Arne
authors.initials: A
authors.lastname: Helth
authors.affiliation: Institució Catalana de Recerca i Estudis Avançats, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Spain.|Facultat de Ciències, Departament de Física, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Sort
authors.affiliation: Facultat de Ciències, Departament de Física, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Spain.
authors.forename: Maria Dolors
authors.initials: MD
authors.lastname: Baró
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.
authors.forename: Mariana
authors.initials: M
authors.lastname: Calin
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, D-01062, Dresden, Germany.
authors.forename: Ludwig
authors.initials: L
authors.lastname: Schultz
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, D-01062, Dresden, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Eckert
authors.affiliation: IFW Dresden, D-01171, Dresden, Germany.
authors.forename: Annett
authors.initials: A
authors.lastname: Gebert
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001031:Apatites / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003343:Corrosion; D053758:Nanoparticles / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D012825:Silicon / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: D000497:Alloys; D001031:Apatites; D001672:Biocompatible Materials; C022107:Bioglass; D017640:Silicates; D009556:Niobium; C003784:zircon; D015040:Zirconium; D014025:Titanium; D012825:Silicon
keywords: Auger electron spectroscopy; Ringer solution; Ti alloy; X-ray photoelectron spectroscopy; corrosion; implant; metallic glass