Electropolishing and passivation of NiTi shape memory alloy

Wojciech Simka*, Marcin Kaczmarek, Aleksandra Baron-Wiecheć, Ginter Nawrat, Jan Marciniak, Jerzy Zak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Electropolishing of NiTi alloy has been investigated. The influence of polishing bath composition and the operating conditions instead of the conditions of the process on the quality of the surface, evaluated by AFM and SEM methods, was established. Morphologically uniform surfaces were obtained only in the case of solutions containing hydrofluoric and sulfuric acids. Electropolished samples were sterilized and thermally passivated, then their corrosion resistance was measured in Tyrode's physiological solution. It was established that already after the electropolishing the corrosion resistance of NiTi alloy increases due to the spontaneously formed TiO2 layer. The increase of the thickness of the layer during sterilization and thermal passivation causes further increase in the corrosion resistance.

Original languageEnglish
Pages (from-to)2437-2441
Number of pages5
JournalElectrochimica Acta
Volume55
Issue number7
DOIs
StatePublished - 28 Feb 2010
Externally publishedYes

Keywords

  • Biomaterials
  • Corrosion
  • Electrochemical impedance spectroscopy
  • Electropolishing
  • NiTi
  • Passivation

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