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Square Wave Pulsed Electrodeposition of Chromium from Deep Eutectic Solvent (DES) Based on Choline Chloride

Gengan Saravanan, Subramanian Mohan


Electrodeposition of chromium from hexavalent chromium ion is very toxic, carcinogenic, not environmentally benign, cathodic efficiency is low, and the quality of coating is very poor (due to H2 evolution). Ambient temperature Deep Eutectic Solvent (DES) can be formed by reacting choline chloride (HOC2H4 (CH3)3Cl) with metal salts. These low cost DES are not sensitive to air and moisture and have good electro-conductivity and they do not have vapour pressure. DES is promising electrolyte for electrodeposition of nano-sized metals and alloys in the metal finishing industry. In the present study, the electrodeposition of chromium films from a solution of DES containing chromium (III) has been investigated by square wave pulse current technique. Homogeneous and well adherent Cr films have been obtained with 65% current efficiency which is 50% higher than Cr deposited from aqueous Cr(III)-based electrolyte.

Keywords: chromium, choline chloride, deep eutectic solvent, desorption, metals

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