title: Technological capabilities of surface layers formation on implant made of Ti-6Al-4V ELI alloy.
abstract: OBJECTIVE
  The aim of the presented research was to find a combination of surface modification methods of implants made of the Ti-6Al-4V ELI alloy, that lead to formation of effective barrier for metallic ions that may infiltrate into solution.
  
  
  METHODS
  To this end, the following tests were carried out: roughness measurement, the voltamperometric tests (potentiodynamic and potentiostatic), and the ion infiltration test.
  
  
  RESULTS
  The electropolishing process resulted in the lowering of surface roughness in comparison with mechanical treatment of the surface layer. The anodization process and steam sterilization increased corrosion resistance regardless of the mechanical treatment or electropolishing. The crevice corrosion tests revealed that independent of the modification method applied, the Ti-6Al-4V ELI alloy has excellent crevice corrosion resistance. The smallest quantity of ions infiltrated to the solution was observed for surface modification consisting in the mechanical treatment and anodization with the potential of 97 V.
  
  
  CONCLUSIONS
  Electric parameters deter- mined during studies were the basis for effectiveness estimation of particular surface treatment methods. The research has shown that the anodization process significantly influences the pitting corrosion resistance of the Ti-6Al-4V ELI alloy independent of the previous surface treatment methods (mechanical and electrochemical). The surface layer after such modification is a protective barrier for metallic ions infiltrated to solution and protects titanium alloy against corrosive environment influence.
authors.affiliation: Silesian University of Technology, Faculty of Biomedical Engineering, Department of Biomaterials and Medical Devices Engineering, Zabrze, Poland.
authors.forename: Marta
authors.initials: M
authors.lastname: Kiel-Jamrozik
authors.affiliation: Silesian University of Technology, Faculty of Biomedical Engineering, Department of Biomaterials and Medical Devices Engineering, Zabrze, Poland.
authors.forename: Janusz
authors.initials: J
authors.lastname: Szewczenko
authors.affiliation: Silesian University of Technology, Faculty of Biomedical Engineering, Department of Biomaterials and Medical Devices Engineering, Zab.
authors.forename: Marcin
authors.initials: M
authors.lastname: Basiaga
authors.affiliation: Silesian University of Technology, Faculty of Mining and Geology, Institute of Applied Geology, Gliwice, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Nowińska
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials / Q000737:chemistry; D003343:Corrosion; D004563:Electrochemistry; D007477:Ions; D008422:Materials Testing; D019736:Prostheses and Implants; D011474:Prosthesis Design; D012996:Solutions; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D007477:Ions; D012996:Solutions; C031462:titanium alloy (TiAl6V4); D014025:Titanium