Characterization of oxide coatings formed on tantalum by plasma electrolytic oxidation in 12-tungstosilicic acid |
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| Authors: | M Petkovi?S Stojadinovi? R Vasili?Lj Zekovi? |
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| Institution: | a Faculty of Physics, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
b Faculty of Environmental Governance and Corporate Responsibility, Educons University, Vojvode Putnika bb, Sremska Kamenica, Serbia |
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| Abstract: | Oxide coatings were formed on tantalum by plasma electrolytic oxidation (PEO) process in 12-tungstosilicic acid. The PEO process can be divided into three stages with respect to change of the voltage-time response. The contribution of electron current density in total current density during anodization results in the transformation of the slope of voltage-time curve. The surface morphology, chemical and phase composition of oxide coatings were investigated by AFM, SEM-EDX, XRD and Raman spectroscopy. Oxide coating morphology is strongly dependent of PEO time. The elemental components of PEO coatings are Ta, O, Si and W. The oxide coatings are partly crystallized and mainly composed of WO3, Ta2O5 and SiO2. Raman spectroscopy showed that the outer layer of oxide coatings formed during the PEO process is silicate tungsten bronze. |
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| Keywords: | Tantalum Plasma electrolytic oxidation (PEO) 12-Tungstosilicic acid Silicate tungsten bronze |
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