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621. 377

THE EFFECT OF REVERSE PULSE CURRENT ON THE PROCESS OF ELECTRODEPOSITION OF COBALT COATINGS FROM SULFATE ELECTROLYTES

B.A. Spiridonov

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Voronezh State Technical University, Russian Federation 394006, Voronezh, ul 20-letiya Oktyabrya, 84

Corresponding author: B. A. Spiridonov, E-mail:b.a.spiridonov@yandex.ru

The influence of the modes of reverse pulse current on the process of electrodeposition of cobalt coatings of sulfuric acid electrolytes with monoethanolamine. It is established that by varying the parameters of the reverse pulse current – time cathode to and anodic pulses and you can change the properties of cathodic precipitation. At a ratio of from 20 1 to 20 3 internal stresses in coatings are reduced by ~ 25 % (і = 8 A/dm2). Based on these data, it is established that for receiving brilliant and solid cobalt coatings with less NR from sulfate electro-

lytes (100 g/l Ѕ 4) with addition of monoethanolamine (2 ml/l) electrolysis should be carried out on a reverpulse current mode = 20 2-4.

Keywords: sulfuric acid solution, monoethanolamine, cobalt coating, kinetics, current efficiency, hardness, internal str

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