Krishnan, R.M. and Ramakrishnan, A. and Sobha , J. and Sriveeraraghavan, S. and Kannan, N. and Natarajan, S.R. (1996) Studies of chromium plating from low concentration electrolytes. Bulletin of Electrochemistry, 12 (5-6). pp. 278-282. ISSN 0256-1654

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Chromium plating is generally carried out from electrolytes containing chromic acid along with a small quantity of sulphate in the absence or presence of fluorine compound. Normally fairly concentrated solutions with 250 to 400 g/l chromic acid are used. Such a high concentration of chromic acid leads to excess drag out losses and higher effluent treatment costs. These considerations have necessitated investigations abroad on the usefulness of low concentration solution. In this paper the authors high lights the results of studies on low concentration electrolytes. Experiments were carried out with various concentrations of chromic acid from 50 g/l to 250 g/l in the presence of 1% sulphate by means of hull cell tests in order to determine the basic solution composition. Current efficiency and rate of build-up were also determined in the case of selected compositions. The effect of boric acid or lanthanum oxide were investigations in certain solution composition.

Item Type: Article
Uncontrolled Keywords: Plating; chromic acid and boric acid or lanthanum oxide
Subjects: Industrial Metal Finishing
Depositing User: ttbdar CECRI
Date Deposited: 23 May 2012 09:20
Last Modified: 23 May 2012 09:20

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