Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts
The interaction of substrates from ceramics, beryllium, and carbopyroceram with the electrolyte for the electrodeposition of niobium coatings was investigated. The corrosion resistance of spherical ceramic and beryllium samples with the protective molybdenum films obtained by magnetron sputtering wa...
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doaj-a3985cf1dfc74889a5739b62f2ad56af2020-11-25T00:29:42ZengMDPI AGCoatings2079-64122018-06-018621310.3390/coatings8060213coatings8060213Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten SaltsAnton Dubrovskiy0Maksim Okunev1Olga Makarova2Sergey Kuznetsov3Tananaev Institute of Chemistry, Kola Science Centre, Russian Academy of Sciences, 184209 Apatity, RussiaTananaev Institute of Chemistry, Kola Science Centre, Russian Academy of Sciences, 184209 Apatity, RussiaTananaev Institute of Chemistry, Kola Science Centre, Russian Academy of Sciences, 184209 Apatity, RussiaTananaev Institute of Chemistry, Kola Science Centre, Russian Academy of Sciences, 184209 Apatity, RussiaThe interaction of substrates from ceramics, beryllium, and carbopyroceram with the electrolyte for the electrodeposition of niobium coatings was investigated. The corrosion resistance of spherical ceramic and beryllium samples with the protective molybdenum films obtained by magnetron sputtering was studied. The exfoliation of molybdenum film from ceramics and beryllium samples was observed after the experiments due to the interaction of substrates with the melt. It was found that the carbopyroceram did not corrode in the niobium containing melt and this material was chosen as the substrate for the electrodeposition of superconducting niobium coatings. The influence of the oxide ions on the electrochemical behavior of niobium complexes in the NaCl–KCl–NaF–K2NbF7 melt was studied. A special form of the cathode was constructed for the electrodeposition of niobium coatings on spherically shaped substrates. Electrodeposition of the niobium coatings on spheres 10 mm in diameter manufactured from carbopyroceram was carried out at 750 °C with the cathodic current density of 5 × 10−3–2 × 10−2 A·cm−2 and the electrolysis time of 8–12 h. Influence of the cathodic current density on the microstructure of niobium coatings was studied. The roughness, nonsphericity, and superconductive properties of niobium coatings were determined.http://www.mdpi.com/2079-6412/8/6/213molten saltscorrosion resistanceelectrochemistry of niobium complexeselectrodepositionhigh purity niobium coatings |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anton Dubrovskiy Maksim Okunev Olga Makarova Sergey Kuznetsov |
spellingShingle |
Anton Dubrovskiy Maksim Okunev Olga Makarova Sergey Kuznetsov Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts Coatings molten salts corrosion resistance electrochemistry of niobium complexes electrodeposition high purity niobium coatings |
author_facet |
Anton Dubrovskiy Maksim Okunev Olga Makarova Sergey Kuznetsov |
author_sort |
Anton Dubrovskiy |
title |
Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts |
title_short |
Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts |
title_full |
Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts |
title_fullStr |
Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts |
title_full_unstemmed |
Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts |
title_sort |
superconducting niobium coatings deposited on spherical substrates in molten salts |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2018-06-01 |
description |
The interaction of substrates from ceramics, beryllium, and carbopyroceram with the electrolyte for the electrodeposition of niobium coatings was investigated. The corrosion resistance of spherical ceramic and beryllium samples with the protective molybdenum films obtained by magnetron sputtering was studied. The exfoliation of molybdenum film from ceramics and beryllium samples was observed after the experiments due to the interaction of substrates with the melt. It was found that the carbopyroceram did not corrode in the niobium containing melt and this material was chosen as the substrate for the electrodeposition of superconducting niobium coatings. The influence of the oxide ions on the electrochemical behavior of niobium complexes in the NaCl–KCl–NaF–K2NbF7 melt was studied. A special form of the cathode was constructed for the electrodeposition of niobium coatings on spherically shaped substrates. Electrodeposition of the niobium coatings on spheres 10 mm in diameter manufactured from carbopyroceram was carried out at 750 °C with the cathodic current density of 5 × 10−3–2 × 10−2 A·cm−2 and the electrolysis time of 8–12 h. Influence of the cathodic current density on the microstructure of niobium coatings was studied. The roughness, nonsphericity, and superconductive properties of niobium coatings were determined. |
topic |
molten salts corrosion resistance electrochemistry of niobium complexes electrodeposition high purity niobium coatings |
url |
http://www.mdpi.com/2079-6412/8/6/213 |
work_keys_str_mv |
AT antondubrovskiy superconductingniobiumcoatingsdepositedonsphericalsubstratesinmoltensalts AT maksimokunev superconductingniobiumcoatingsdepositedonsphericalsubstratesinmoltensalts AT olgamakarova superconductingniobiumcoatingsdepositedonsphericalsubstratesinmoltensalts AT sergeykuznetsov superconductingniobiumcoatingsdepositedonsphericalsubstratesinmoltensalts |
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1725330415854551040 |