Plasma Electrolytic Oxidation of Zr-1%Nb Alloy: Effect of Sodium Silicate and Boric Acid Addition to Calcium Acetate-Based Electrolyte

Veta Aubakirova; Ruzil Farrakhov; Vasily Astanin; Arseny Sharipov; Mikhail Gorbatkov; Evgeny Parfenov

doi:10.3390/ma15062003

journal article Open Access Mar 08, 2022

Plasma Electrolytic Oxidation of Zr-1%Nb Alloy: Effect of Sodium Silicate and Boric Acid Addition to Calcium Acetate-Based Electrolyte

Veta Aubakirova Ruzil Farrakhov Vasily Astanin

Arseny Sharipov Mikhail Gorbatkov Evgeny Parfenov

Materials Vol. 15 No. 6 pp. 2003 · MDPI AG

View at Publisher Save 10.3390/ma15062003

Abstract

This work aimed at the development of wear and corrosion resistant oxide coatings for medical implants made of zirconium alloy, by plasma electrolytic oxidation (PEO). The effect of sodium silicate and boric acid addition to calcium acetate electrolyte on the coating properties was studied. Different aspects of the PEO coating were investigated: microstructure, electrochemical and wear behavior, wettability and apatite-forming ability. The resultant coatings consist of a dense inner layer 1.4–2.2 µm thick and a porous outer layer. The total thickness of the coating is 12–20 µm. It was found that the coating contains the tetragonal zirconia (70–95%). The obtained coatings show high corrosion resistance and reduce the surface corrosion current by 1–3 orders of magnitude, depending on the electrolyte additive, compared to the uncoated surface. The addition of boric acid to the electrolyte significantly increases the wear resistance of the coating and reduces the coefficient of friction. In terms of the combination of the coating characteristics, the electrolyte with the addition of the alkali and boric acid is recommended as the most effective.

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Published: Mar 08, 2022
Vol/Issue: 15(6)
Pages: 2003
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Authors

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Veta Aubakirova