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.
Highlights
R.; Astanin, V.; Sharipov, A.; 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)
Plasma electrolytic oxidation (PEO) is a method for producing a coating that provides an effective protection of the Zr surface [12,13]
This work examines the effect of silicate and boron compounds of on the PEO coatings obtained in an electrolyte based on calcium acetate with phosphate and sodium hydroxide to recommend an electrolyte composition with optimal corrosion, wear and apatite forming properties for medical implants
Summary
Zirconium alloys are a promising alternative to titanium alloys in orthopaedic and dental applications due to their better compatibility with magnetic resonance imaging diagnostics because of two-fold lower magnetic susceptibility [1]. Malayoğlu et al [25] studied the effect of process duration on the wear and corrosion resistance for the coatings obtained in an electrolyte based on sodium silicate and potassium hydroxide with boric acid. This electrolyte did not contain calcium compounds. This work examines the effect of silicate and boron compounds of on the PEO coatings obtained in an electrolyte based on calcium acetate with phosphate and sodium hydroxide to recommend an electrolyte composition with optimal corrosion, wear and apatite forming properties for medical implants
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