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Effect of Potassium Formate, Glycine and Oxalic Acid in Sulfate Bath on Trivalent Chromium Deposition Composition and Current Efficiency  

Kim, Man (Department of Surface Engineering, Korea Institute of Machinery & Materials)
Kim, Dae-Young (Department of Surface Engineering, Korea Institute of Machinery & Materials)
Park, Sang-Eon (Department of Surface Engineering, Korea Institute of Machinery & Materials)
Kwon, Sik-Chul (Department of Surface Engineering, Korea Institute of Machinery & Materials)
Choi, Yong (Division of Advanced Materials and Bio-Chemical Engineering, Sunmoon University)
Publication Information
Journal of the Korean institute of surface engineering / v.37, no.2, 2004 , pp. 86-91 More about this Journal
Abstract
Effect of potassium formate, glycine and oxalic acid in a sulfate solution on the deposit composition and current efficiency of trivalent chromium plating was studied. The trivalent chromium layers prepared by solutions with potassium formate, glycine and oxalic acid contain a few carbon inside. The solutions containing potassium formate, glycine and oxalic acid are relatively stable with pH change. The solution with the potassium formate shows 6-30％ current efficiency with current density, whereas, the solutions with oxalic acid and glycine show about 5％ current efficiency, respectively. The improved current efficiency is related to enough supply of chromium ions to the electrode due to the increase of pH at the front of electrode.
Keywords
Trivalent chromium; Sulfate bath; Potassium formate; Glycine; Oxalic acid; Current efficiency;
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