Process for the electrolytic deposit of chromium

Details Process for the electrolytic deposit of chromium Process for the electrolytic deposit of chromium

1982-10-18

1984-07-17

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

C25D 306

Patent

active

044604386

ABSTRACT:
A process for the electrolytic deposition of chromium by means of a bath of trivalent chromium is characterized in that it uses, as electrolyte, a solution which is obtained by careful reduction of the chromic acid in a sulfuric medium by an excess of a reducing agent of the alcohol type, such as methanol. Subsequently this solution is diluted with water without indispensable addition of additional products. The electrolysis is effected without separation of the anodic and cathodic compartments at an anode-cathode potential difference greater than 6 volts, the cathodic current density being of the order of 10 to 40 amperes per dm.sup.2, the concentration of trivalent chromium ranging from 0,1 to 1 ion-gram per liter and the pH from 1 to 1,5.

REFERENCES:
patent: 4142948 (1979-03-01), Tajima et al.
Larissa Domnikov, Metal Finishing, pp. 107-109, vol. 64, No. 6, (1966).

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