Corrosion resistance evaluation of a Ca- and P-based bioceramic thin coating in Ti-6Al-4V.

Journal of Materials Science. Materials in Medicine
Paulo G CoelhoVan P Thompson

Abstract

The objective of this study was to physico/chemically characterize and determine the corrosion resistance of a Calcium-Phosphate (Ca-P) based bioceramic thin coating processed by a sputtering process on titanium alloy (Ti-6Al-4V). The samples utilized in this study were uncoated and coated disks of 10 mm diameter by 3 mm thickness. The coating was characterized by SEM, XPS + ion beam milling (IBM), thin-film mode XRD, and atomic force microscope (AFM) (n = 3). Coated and uncoated Ti-6Al-4V disk surfaces were tested in Phosphate Buffered Saline (PBS) at 25 degrees C through an area of 0.79 cm(2). A three-electrode cell set-up was used with a saturated calomel electrode (SCE) and a platinum wire as reference and counter electrodes. After 3, 17, and 25 days of immersion, electrochemical impedance spectroscopy (EIS) experiments were performed (n = 3). The EIS tests were carried out in potentiostatic mode at the open circuit potential (OCP). The frequency range considered was from 100 kHz to 10 mHz, using 10 mV root mean square as the amplitude of the perturbation signal. A potentiodynamic polarization scan using a frequency response analyzer potentiostat, was acquired following 3 days of immersion in PBS. The potentiodynamic polari...Continue Reading

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Citations

Jun 29, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Sergey V Dorozhkin
Feb 4, 2010·Journal of Biomedical Materials Research. Part a·Camilla C G MouraPaulo G Coelho
Jan 30, 2015·Journal of Materials Science. Materials in Medicine·Jinhuan TianHong Li
Jan 7, 2017·The Journal of Craniofacial Surgery·Soo-Hwan ByunJong-Ho Lee

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