3139
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№ 2 (17), 2018 |
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© |
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. ., 2018 |
100
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№ 2 (17), 2018 |
INVESTIGATION OF THE PROCESS OF ELECTRODEPTION OF
COBALT COATINGS FROM SULFURIC ELECTROLYTEES WITH
MONOETANOLAMINE
B.A. Spiridonov*, M.A. Zavalishin
Voronezh State Technical University, Russian Federation, 394006, Voronezh, the 20th Anniversary of October, 84
*Corresponding author: Spiridonov B.A., E-mail: b.a.spiridonov@yandex.ru
The kinetics of electroreduction of cobalt from sulphate electrolytes containing a surfac- tant-monoethanolamine (MEA) is studied. It has been established that cobalt does not precipitate from the electrolyte without MEA, since a film of cobalt hydroxide is formed on the surface of the cathode. In the presence of MEA from 1.5 to 2 ml / l, the quality of cobalt coatings improves significantly, gloss appears, and microhardness increases. X-ray diffraction method established the relationship between the phase composition of cobalt coatings and the pH of the electrolyte. Of acid electrolytes (pH 1.0 and 1.7), β-Co is precipitated, and less acidic (pH 3.0) is mainly α-Co.
Keywords: electrolysis, cobalt coatings, sulphate electrolyte, monoethanolamine, kinetics, structure, internal stresses, microhardness
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№ 2 (17), 2018 |
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№ 2 (17), 2018 |
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107
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№ 2 (17), 2018 |
1. |
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3. Moral F.R. [Electroplating of cobalt and cobalt alloys a review]. Plating, |
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1967, vol. 5, no 6, P. 693-701. |
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я, 394006, . |
, . 20- |
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я я, 84 |
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* |
я |
: |
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, E-mail: robi57@mail.ru |
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© |
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. ., 2018 |
109