Morphology and porosity of titanium alloys surface after plasma-electrolytic oxidation in an alkaline environment with diatomite

Keywords

plasma-electrolytic oxidation, medical titanium alloys, roughness, porosity, diatomite.

Cite as

Imbirovych N. Yu., Zvirko O. I., and Kurzydlowski K. J. Morphology and porosity of titanium alloys surface after plasma-electrolytic oxidation in an alkaline environment with diatomite. Physicochemical Mechanics of Materials. 2023. 59(4), 67-74.

https://doi.org/10.15407/pcmm2023.04.067

Abstract

Surface morphology and porosity are important functional properties of biocompatible oxide ceramic coatings synthesized on titanium alloys. The effect of the composition of the electrolyte for the plasma-electrolytic oxidation of the Ti–6Al–4V titanium alloy on the roughness and porosity of the formed coatings is clarified. Calcium hydroxyl­apatite and diatomite were added to the basic alkaline aqueous solution based on potas­sium and calcium hydroxides, sodium silicate, pyrophosphate and hexamethophosphate. It is shown that the addition of calcium hydroxylapatite contributes to the formation of coatings with higher porosity. It is found that as a result of a 4-time increase in the con­centration of elec­trolyte components and the addition of diatomite (20 g/l), the coating synthesis is stabi­lized and coatings with higher roughness (in 3–4 times) and porosity (in 1.9 times) are formed compared to coatings, synthesized in an electrolyte without diato­mite. Doubling the duration of synthesis in an environment with diatomite contributes to a further increase in the coating roughness.

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