4.4 Article

Porous Biocoatings Based on Diatomite with Incorporated ZrO2 Particles for Biodegradable Magnesium Implants

Journal

JOURNAL OF FUNCTIONAL BIOMATERIALS
Volume 14, Issue 5, Pages -

Publisher

MDPI
DOI: 10.3390/jfb14050241

Keywords

magnesium implants; micro-arc coating; diatomite; ZrO2 particles; corrosion resistance

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In this study, porous diatomite biocoatings were created on the surface of a biodegradable Mg alloy using the method of micro-arc oxidation. The addition of ZrO2 microparticles was found to affect the structure and properties of the coatings. The coatings exhibited a porous structure and increased adhesive strength and corrosion resistance with the incorporation of ZrO2 particles.
In the present work, the surface of a biodegradable Mg alloy was modified to create porous diatomite biocoatings using the method of micro-arc oxidation. The coatings were applied at process voltages in the range of 350-500 V. We have studied the influence of the addition of ZrO2 microparticles on the structure and properties of diatomite-based protective coatings for Mg implants. The structure and properties of the resulting coatings were examined using a number of research methods. It was found that the coatings have a porous structure and contain ZrO2 particles. The coatings were mostly characterized by pores less than 1 mu m in size. However, as the voltage of the MAO process increases, the number of larger pores (5-10 mu m in size) also increases. However, the porosity of the coatings varied insignificantly and amounted to 5 +/- 1%. It has been revealed that the incorporation of ZrO2 particles substantially affects the properties of diatomite-based coatings. The adhesive strength of the coatings has increased by approximately 30%, and the corrosion resistance has increased by two orders of magnitude compared to the coatings without zirconia particles.

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