Study of the effect of current pulse frequency on Ti-6Al-4V alloy coating formation by micro arc oxidation

Alexander Sobolev, Alexey Kossenko, Konstantin Borodianskiy

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The micro arc oxidation (MAO) process has been applied to produce ceramic oxide coating on Ti-6Al-4V alloy. The MAO process was carried out at the symmetric bipolar square pulse in electrolyte containing Na2CO3 and Na2SiO3. The effect of current frequency on the surface morphology, the chemical and the phase compositions as well as the corrosion resistance was examined. Morphology and cross-sectional investigation by electron microscopy evaluated more compacted and less porous coating produced by high current frequency (1000 Hz). This alloy also exhibited a high corrosion resistance in comparison with the untreated alloy. Additionally, the alloy subjected to MAO treatment by a current frequency of 1000 Hz showed a higher corrosion resistance in comparison with alloys obtained by lower current frequencies. This behavior was attributed to more compacted and less porous morphology of the coating.

Original languageEnglish
Article number3983
JournalMaterials
Volume12
Issue number23
DOIs
StatePublished - 1 Dec 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Corrosion resistance
  • Current pulse frequency
  • Micro arc oxidation
  • Ti-6Al-4V alloy
  • Titanium oxide

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