Formation of Ca/P ceramic coatings by Plasma Electrolytic Oxidation (PEO) on Ti6Al4V ELI alloy

The formation of PEO ceramic coatings on Ti6Al4V ELI alloy was investigated using a phosphate/calcium containing electrolyte at 300 and 400V at 310K for different times. The Plasma Electrolytic Oxidation (PEO) coated specimens were then heat treated at 873 and 1073K for 2 hours. Scanning electron mi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-12, Vol.935 (1), p.12031
Main Authors: Rodriguez-Jaimes, Y, Naranjo, D I, Blanco, S, García-Vergara, S J
Format: Article
Language:English
Subjects:
Biomedical materials
Body fluids
Ceramic coatings
Ceramic glazes
Ceramics
Coating effects
Corrosion resistance
Corrosion resistant alloys
Electric potential
Electrochemical impedance spectroscopy
Heat treatment
Hydroxyapatite
Morphology
Oxidation
Physics
Protective coatings
Spectrum analysis
Thickness
Titanium base alloys
Voltage
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Summary:The formation of PEO ceramic coatings on Ti6Al4V ELI alloy was investigated using a phosphate/calcium containing electrolyte at 300 and 400V at 310K for different times. The Plasma Electrolytic Oxidation (PEO) coated specimens were then heat treated at 873 and 1073K for 2 hours. Scanning electron microscopy, Energy Dispersive X-Ray Spectroscopy (EDS) and X-ray diffraction analysis were used to study the composition and the morphology of the ceramic coatings. The corrosion behaviour of the coatings was studied by Electrochemical Impedance Spectroscopy (EIS) in Simulated Body Fluid (SBF). The PEO-treated specimens primarily revealed a porous structure with thickness between 4 and 12μm, according to the voltage and process time used. The coatings are mainly composed of hydroxyapatite; however, as the voltage and anodizing time increase, the Ca/P ratio decreases. Generally, the corrosion resistance of the alloy was improved by the PEO-treated coatings, although the specimens treated at 1073K showed the presence of cracks that reduced the protective effect of the coatings.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/935/1/012031