|
|||||
|
|
Preparation of silicate tungsten bronzes on aluminum by plasma electrolytic oxidation process in 12-tungstosilicic acid |
|
| Authors: | M. Petkovi?S. Stojadinovi? R. Vasili?I. Bel?a Z. Nedi?B. Kasalica U.B. Mio? |
| Affiliation: | 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 c Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia |
| Abstract: | The growth of silicate tungsten bronzes on aluminum by plasma electrolytic oxidation in 12-tungstosilicic acid is experimentally investigated and discussed. Real time imaging and optical emission spectroscopy characterization of plasma electrolytic oxidation show that spatial density of microdischarges is the highest in the early stage of the process, while the percentage of oxide coating area covered by active discharge sites decreases slowly with time. Emission spectrum of microdischarges has several intensive band peaks originating either from aluminum electrode or from the electrolyte. Surface roughness of obtained oxide coatings increases with prolonged time of plasma electrolytic oxidation, as their microhardness decreases. Raman spectroscopy and energy dispersive X-ray spectroscopy are employed to confirm that the outer layer of oxide coatings formed during the plasma electrolytic oxidation process is silicate tungsten bronzes. |
| Keywords: | Plasma electrolytic oxidation (PEO) 12-Tungstosilicic acid Silicate tungsten bronzes |
| 本文献已被 ScienceDirect 等数据库收录！ | |