Effect of non-stationary current regimes on the morphology of silver electrodeposits
Efekat nestacionarnih strujnih režima na morfologiju taloga srebra
Authors
Dimitrov, Aleksandar T.Paunović, Perica
Popovski, Orce
Slavkov, Dragan
Kamberović, Željko
Hadži-Jordanov, Svetomir
Article (Published version)
Metadata
Show full item recordAbstract
This work is concerned with the use of reverse current regimes in order to form small-grained and compact silver deposits during the electrorefining process. Several parameters were varied, i.e., i) anodic overpotential, ii) cathodic vs. anodic time ratio and iii) duration of the anodic pulse. After optimization of these parameters, phosphate ions were added and the electrolyte was stirred. The effects of a rise of the anodic overpotential on the grain sizes of the silver deposit and compactness were studied. Prolongation of the anodic time had a similar influence but with a decrease in current efficiency. An increase of the cathodic vs. anodic time ratio caused an enlargement of the grains and a decrease in the compactness of the deposit. Optimal morphological characteristics were obtained when PO3-4 were added and the electrolyte was stirred.
Rad se bavi korišćenjem reversnih strujnih režima za dobijanje sitnozrnih i kompaktnih taloga srebra u procesu elektrohemijske rafinacije. Varirano je nekoliko parametara: a) anodna prenapetost, b) odnos vremena trajanja katodnog i anodnog pulsa i c) trajanje anodnog pulsa. Nakon optimizacije ovih parametara, u elektrolit su dodati fosfatni joni i primenjeno je mešanje elektrolita. Ispitivan je uticaj anodne prenapetosti na veličinu zrna taloga srebra i na njegovu kompaktnost. Produženje trajanja anodnog pulsa pokazalo je sličan efekat, ali uz smanjenje iskorišćenja struje. Povećanje odnosa vremena trajanja katodnog i anodnog pulsa dovelo je do povećanja zrna i smanjenja kompaktnosti taloga. Optimalna morfologija taloga je dobijena nakon dodatka PO3-4 i uz mešanje elektrolita.
Keywords:
silver / reverse current / electrorefining / nitrate solution / electrodepositionSource:
Journal of the Serbian Chemical Society, 2009, 74, 3, 279-289Publisher:
- Serbian Chemical Society, Belgrade
Funding / projects:
- Ministry of Education and Science of the Republic of Macedonia
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Dimitrov, Aleksandar T. AU - Paunović, Perica AU - Popovski, Orce AU - Slavkov, Dragan AU - Kamberović, Željko AU - Hadži-Jordanov, Svetomir PY - 2009 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1374 AB - This work is concerned with the use of reverse current regimes in order to form small-grained and compact silver deposits during the electrorefining process. Several parameters were varied, i.e., i) anodic overpotential, ii) cathodic vs. anodic time ratio and iii) duration of the anodic pulse. After optimization of these parameters, phosphate ions were added and the electrolyte was stirred. The effects of a rise of the anodic overpotential on the grain sizes of the silver deposit and compactness were studied. Prolongation of the anodic time had a similar influence but with a decrease in current efficiency. An increase of the cathodic vs. anodic time ratio caused an enlargement of the grains and a decrease in the compactness of the deposit. Optimal morphological characteristics were obtained when PO3-4 were added and the electrolyte was stirred. AB - Rad se bavi korišćenjem reversnih strujnih režima za dobijanje sitnozrnih i kompaktnih taloga srebra u procesu elektrohemijske rafinacije. Varirano je nekoliko parametara: a) anodna prenapetost, b) odnos vremena trajanja katodnog i anodnog pulsa i c) trajanje anodnog pulsa. Nakon optimizacije ovih parametara, u elektrolit su dodati fosfatni joni i primenjeno je mešanje elektrolita. Ispitivan je uticaj anodne prenapetosti na veličinu zrna taloga srebra i na njegovu kompaktnost. Produženje trajanja anodnog pulsa pokazalo je sličan efekat, ali uz smanjenje iskorišćenja struje. Povećanje odnosa vremena trajanja katodnog i anodnog pulsa dovelo je do povećanja zrna i smanjenja kompaktnosti taloga. Optimalna morfologija taloga je dobijena nakon dodatka PO3-4 i uz mešanje elektrolita. PB - Serbian Chemical Society, Belgrade T2 - Journal of the Serbian Chemical Society T1 - Effect of non-stationary current regimes on the morphology of silver electrodeposits T1 - Efekat nestacionarnih strujnih režima na morfologiju taloga srebra EP - 289 IS - 3 SP - 279 VL - 74 UR - https://hdl.handle.net/21.15107/rcub_technorep_1374 ER -
@article{ author = "Dimitrov, Aleksandar T. and Paunović, Perica and Popovski, Orce and Slavkov, Dragan and Kamberović, Željko and Hadži-Jordanov, Svetomir", year = "2009", abstract = "This work is concerned with the use of reverse current regimes in order to form small-grained and compact silver deposits during the electrorefining process. Several parameters were varied, i.e., i) anodic overpotential, ii) cathodic vs. anodic time ratio and iii) duration of the anodic pulse. After optimization of these parameters, phosphate ions were added and the electrolyte was stirred. The effects of a rise of the anodic overpotential on the grain sizes of the silver deposit and compactness were studied. Prolongation of the anodic time had a similar influence but with a decrease in current efficiency. An increase of the cathodic vs. anodic time ratio caused an enlargement of the grains and a decrease in the compactness of the deposit. Optimal morphological characteristics were obtained when PO3-4 were added and the electrolyte was stirred., Rad se bavi korišćenjem reversnih strujnih režima za dobijanje sitnozrnih i kompaktnih taloga srebra u procesu elektrohemijske rafinacije. Varirano je nekoliko parametara: a) anodna prenapetost, b) odnos vremena trajanja katodnog i anodnog pulsa i c) trajanje anodnog pulsa. Nakon optimizacije ovih parametara, u elektrolit su dodati fosfatni joni i primenjeno je mešanje elektrolita. Ispitivan je uticaj anodne prenapetosti na veličinu zrna taloga srebra i na njegovu kompaktnost. Produženje trajanja anodnog pulsa pokazalo je sličan efekat, ali uz smanjenje iskorišćenja struje. Povećanje odnosa vremena trajanja katodnog i anodnog pulsa dovelo je do povećanja zrna i smanjenja kompaktnosti taloga. Optimalna morfologija taloga je dobijena nakon dodatka PO3-4 i uz mešanje elektrolita.", publisher = "Serbian Chemical Society, Belgrade", journal = "Journal of the Serbian Chemical Society", title = "Effect of non-stationary current regimes on the morphology of silver electrodeposits, Efekat nestacionarnih strujnih režima na morfologiju taloga srebra", pages = "289-279", number = "3", volume = "74", url = "https://hdl.handle.net/21.15107/rcub_technorep_1374" }
Dimitrov, A. T., Paunović, P., Popovski, O., Slavkov, D., Kamberović, Ž.,& Hadži-Jordanov, S.. (2009). Effect of non-stationary current regimes on the morphology of silver electrodeposits. in Journal of the Serbian Chemical Society Serbian Chemical Society, Belgrade., 74(3), 279-289. https://hdl.handle.net/21.15107/rcub_technorep_1374
Dimitrov AT, Paunović P, Popovski O, Slavkov D, Kamberović Ž, Hadži-Jordanov S. Effect of non-stationary current regimes on the morphology of silver electrodeposits. in Journal of the Serbian Chemical Society. 2009;74(3):279-289. https://hdl.handle.net/21.15107/rcub_technorep_1374 .
Dimitrov, Aleksandar T., Paunović, Perica, Popovski, Orce, Slavkov, Dragan, Kamberović, Željko, Hadži-Jordanov, Svetomir, "Effect of non-stationary current regimes on the morphology of silver electrodeposits" in Journal of the Serbian Chemical Society, 74, no. 3 (2009):279-289, https://hdl.handle.net/21.15107/rcub_technorep_1374 .