Reduction of Chromium (VI) when Solar Selective Black Chromium is Deposited in the Presence of Organic Additive

B. N. Popov, Texas A & M University - College Station
Ralph E. White, University of South Carolina - Columbia
D. Slavkov, University Kiril and Metodij - Skopje,Yugoslavia
Z. Koneska, University Kiril and Metodij - Skopje,Yugoslavia

© The Electrochemical Society, Inc. 1992. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in the Journal of the Electrochemical Society.

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DOI: 10.1149/1.2069206

http://dx.doi.org/10.1149/1.2069206

Abstract

Electrochemical dc methods were used to study the reduction of chromium (VI) in the presence of organic additives. It is shown that F^–, thiourea, and citric acid are essential to enable deposition of black chrome from concentrated chromic acid solutions. A new formulation of the plating bath is defined. The optimum operating conditions under which spectrally selective surface of black chrome is deposited have been determined.