AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary
The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.
Authors: ANGELINA GAB, VICTOR MALYSHEV, DMYTRO SHAKHNIN, ANA-MARIA POPESCU, VIRGIL CONSTANTIN.
DOI: 10.24193/subbchem.2024.1.03
Published Online: 2024-03-30
Published Print: 2024-03-30
pp. 35-50
VIEW PDF
FULL PDF
This work was undertaken to study the electrodeposition of tungsten from the Na2WO4-B2O3 system in the molten state. The measurement of the EMF being made with platinum-oxygen indicator and tungsten relative electrodes versus platinum-oxygen. Experiment due to dependencies of the platinum-oxygen potential and tungsten electrodes on the B2O3 concentration, are validate by the forming of ditungstate ions W2O72- in the high temperature ionic liquids (HTILs).The electroreduction process of the active species, is controlled by the diffusion; the rate of formation of the active species does not limit the electrode process; Polarization, in galvanostatic and potentiodynamic mode, have highlighted the fact that charge transfer is reversible. In the Na2WO4- B2O3 melt (acid-basic character), in a narrow potential range and at a controlled process potential, the electroreduction of tungsten from its dimeric form is possible due to the multielectronic processes that take place at the electrode surface. This study played an important role in the evolution of tungsten coatings; the corrosion potentials of electrodes (copper, nickel, steel) plated with tungsten, were also measured. In this study, the influence of some parameters (temperature, electrolysis time, cathodic current density, B2O3 concentration) on the cathodic structure and composition was quantified, determining the optimal conditions of the reverse electrodeposition.
Keywords: Tungstate, Borate, Ionic liquid, Electrodeposition, Voltammetry
