Preparation and Characterization of TiO2-SiO2 Bioceramic Coating on Ti Alloy via Electrochemical Anodization and Its Effect on Corrosion Resistance

Marzouk, Rasha Mohammed; Shoreibah, Eatemad; Motawae, Inas Talaat; Shoeib, Madiha Ahmed

doi:10.21608/adjg.2019.6218.1058

Preparation and Characterization of TiO2-SiO2 Bioceramic Coating on Ti Alloy via Electrochemical Anodization and Its Effect on Corrosion Resistance

Document Type : Original Article

Authors

¹ Associate Lecturer of dental biomaterial,faculty of dental medicine,al-azhar university for girls,cairo, egypt

² professor of oral medicine and periodontology

³ Professor of Dental Biomaterials, Faculty of Dentistry-Girls branch,Alazhar University

⁴ Professor and Former Head of Surface Treatment and Corrosion Control, The Central Metallurgical RD Institute, cairo,egypt

10.21608/adjg.2019.6218.1058

Abstract

Abstract
Purpose: The present study was carried out to study changing the anodization parameters and investigate the corrosion resistance of the ceramic coating that will be formed on the CP-Ti by anodization method. Materials and Methods: CP-Ti (10mm×10mm×2mm) were used for fabrication of bioceramic coating through anodization with different parameters using potassium silicate electrolyte. Samples were characterized using XRD, AT-FTIR. Surface roughness was measured using ESEM and surface topography was evaluated by SEM. Tafel polarization and electrochemical impedance spectroscopy were used to detect the change in the corrosion resistance after anodization. Results: XRD revealed that the anodized coated samples showed well defined peaks of Ti and TiO2 and shallow peaks of SiO2. AT-FTIR showed stretching bands of titania and silica. Surface roughness results: anodized coated samples at the optimum conditions had the lowest Ra values while the uncoated group had the highest Ra value. Results of the surface morphology: best evenly distributed ceramic coat was formed at the optimum conditions where (the applied voltage =50v, the electrolyte concentration =3% and process duration=60min). Corrosion resistance of the anodized coated samples at the optimum conditions was markedly increased more than that of the uncoated CP-Ti. Conclusions:optimum conditions of the anodization process to get a uniform anodized coating can be achieved when; the applied voltage is 50v, the electrolyte concentration is 3% and the process duration in 60min. Moreover, formation of a bioceramic coating has been shown to be a useful method for improving the corrosion resistance.

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