COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES

COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES

The chemical composition, current efficiency and some properties of galvanic binary CoMo and CoW alloys, deposited from both alkaline citrate and citrate-pyrophosphate electrolytes, were studied. It is shown that the main difference between mono- and polyligand electrolytes is the mechanism of the e...

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Date:2023
Main Authors: Yapontseva, Yuliya, Kublanovsky, Valeriy, Maltseva, Tetiana
Format: Article
Language:English
Published: V.I.Vernadsky Institute of General and Inorganic Chemistry 2023
Online Access:https://ucj.org.ua/index.php/journal/article/view/516
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Ukrainian Chemistry Journal
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spelling oai:ojs2.1444248.nisspano.web.hosting-test.net:article-5162023-04-18T13:56:28Z COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES Yapontseva, Yuliya Kublanovsky, Valeriy Maltseva, Tetiana alloy, cobalt, tungsten, molybdenum, electrodeposition The chemical composition, current efficiency and some properties of galvanic binary CoMo and CoW alloys, deposited from both alkaline citrate and citrate-pyrophosphate electrolytes, were studied. It is shown that the main difference between mono- and polyligand electrolytes is the mechanism of the electrodeposition process and the rate of passage of limiting stages preceding the formation of an electrochemically active complex. During electrolysis in a citrate solution, the limiting step is the mass transfer of [CoCit2]4– complexes, while in the citrate-pyrophosphate one, the process proceeds with kinetic control, and the hydrodynamic regime does not significantly affect the content of metals and the rate of their deposition. The use of a polyligand electrolyte makes it possible to increase the current efficiency for CoW alloys from 32.1 to 45.5% in the convective mass transfer mode and from 5.9 to 35.7% in the diffusion transfer mode. During electrodeposition from citrate-pyrophosphate electrolytes of the same composition of alloys of two different refractory metals, it was found that the current efficiency of the CoMo alloy is on average 20% higher than that of CoW. It has been found that at a close value of the content of the refractory component in X-ray amorphous alloys, the differences in the magnetic and corrosion properties of the coatings are determined by the nature of the refractory metal. Thus, during electrodeposition from a polyligand electrolyte, CoMo alloys have Ms 300–380 emu·cm-3 and Hc 60–72 Oe, while CoW alloys have Ms 22–45 emu·cm-3 and Hc 50–70 Oe. Both types of alloys are characterized by Mr/Ms – 0.2-0.3. The properties of CoW alloys deposited from a monoligand citrate electrolyte approach hard magnetic materials with Mr/Ms – 0.6–0.7. V.I.Vernadsky Institute of General and Inorganic Chemistry 2023-02-24 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/516 10.33609/2708-129X.89.01.2023.34-45 Ukrainian Chemistry Journal; Vol. 89 No. 1 (2023): Ukrainian Chemistry Journal; 34-45 Украинский химический журнал; Том 89 № 1 (2023): Ukrainian Chemistry Journal; 34-45 Український хімічний журнал; Том 89 № 1 (2023): Український хімічний журнал; 34-45 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/516/263
institution Ukrainian Chemistry Journal
baseUrl_str
datestamp_date 2023-04-18T13:56:28Z
collection OJS
language English
topic_facet alloy
cobalt
tungsten
molybdenum
electrodeposition
format Article
author Yapontseva, Yuliya
Kublanovsky, Valeriy
Maltseva, Tetiana
spellingShingle Yapontseva, Yuliya
Kublanovsky, Valeriy
Maltseva, Tetiana
COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES
author_facet Yapontseva, Yuliya
Kublanovsky, Valeriy
Maltseva, Tetiana
author_sort Yapontseva, Yuliya
title COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES
title_short COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES
title_full COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES
title_fullStr COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES
title_full_unstemmed COMPARISON OF THE PROPERTIES OF CoW AND CoMo ALLOYS DEPOSITED BOTH FROM ALKALINE CITRATE AND CITRATE-PYROPHOSPHATE ELECTROLYTES
title_sort comparison of the properties of cow and como alloys deposited both from alkaline citrate and citrate-pyrophosphate electrolytes
description The chemical composition, current efficiency and some properties of galvanic binary CoMo and CoW alloys, deposited from both alkaline citrate and citrate-pyrophosphate electrolytes, were studied. It is shown that the main difference between mono- and polyligand electrolytes is the mechanism of the electrodeposition process and the rate of passage of limiting stages preceding the formation of an electrochemically active complex. During electrolysis in a citrate solution, the limiting step is the mass transfer of [CoCit2]4– complexes, while in the citrate-pyrophosphate one, the process proceeds with kinetic control, and the hydrodynamic regime does not significantly affect the content of metals and the rate of their deposition. The use of a polyligand electrolyte makes it possible to increase the current efficiency for CoW alloys from 32.1 to 45.5% in the convective mass transfer mode and from 5.9 to 35.7% in the diffusion transfer mode. During electrodeposition from citrate-pyrophosphate electrolytes of the same composition of alloys of two different refractory metals, it was found that the current efficiency of the CoMo alloy is on average 20% higher than that of CoW. It has been found that at a close value of the content of the refractory component in X-ray amorphous alloys, the differences in the magnetic and corrosion properties of the coatings are determined by the nature of the refractory metal. Thus, during electrodeposition from a polyligand electrolyte, CoMo alloys have Ms 300–380 emu·cm-3 and Hc 60–72 Oe, while CoW alloys have Ms 22–45 emu·cm-3 and Hc 50–70 Oe. Both types of alloys are characterized by Mr/Ms – 0.2-0.3. The properties of CoW alloys deposited from a monoligand citrate electrolyte approach hard magnetic materials with Mr/Ms – 0.6–0.7.
publisher V.I.Vernadsky Institute of General and Inorganic Chemistry
publishDate 2023
url https://ucj.org.ua/index.php/journal/article/view/516
work_keys_str_mv AT yapontsevayuliya comparisonofthepropertiesofcowandcomoalloysdepositedbothfromalkalinecitrateandcitratepyrophosphateelectrolytes
AT kublanovskyvaleriy comparisonofthepropertiesofcowandcomoalloysdepositedbothfromalkalinecitrateandcitratepyrophosphateelectrolytes
AT maltsevatetiana comparisonofthepropertiesofcowandcomoalloysdepositedbothfromalkalinecitrateandcitratepyrophosphateelectrolytes
first_indexed 2025-09-24T17:43:48Z
last_indexed 2025-09-24T17:43:48Z
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