METHOD OF ELECTROCHEMICAL APPLICATION OF NICKEL COATING Russian patent published in 2017 - IPC C25D3/12 

FIELD: chemistry.

SUBSTANCE: method involves electrochemical deposition of nickel on a pre-prepared steel plate from an electrolyte containing nickel sulfate (II) sulfate crystal hydrate, nickel (II) chloride hydrate, boric acid and water. Before electrochemical deposition of nickel, a pre-prepared steel plate is held in the electrolyte at a temperature of 20-25°C and a potential of -0.45 V relative to the silver chloride reference electrode. The electrolyte is used as an electrolyte containing: 140 g/l of nickel sulphate crystal hydrate (II), 70 g/l of nickel chloride (II) chloride hydrate, 25 g/l of boric acid and water up to 1 l, And the electrochemical deposition of nickel from mentioned electrolyte is carried out at a temperature of 20-25°C, the cathode current density is 3.5-5.5 A/dm² and a pH of 5.5.

EFFECT: increasing the environmental purity of the process by reducing the evaporation of the electrolyte from the surface of the bath, the method makes it possible to obtain an even semi-glossy nickel coating with a high current and microhardness value.

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