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Nickel films were electrodeposited from modified Watts baths including glycine of 0.2mol/l and ammonium sulfate of 0.2mol/l. Nickel electrodeposits were examined using temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). Higher peaks of m/z = 27 and 52 derived from cyanides were recognized in TPD contour maps of nickel electrodeposits. Furthermore, the XPS N1s spectrum implied that cyanides were present on nickel electrodeposits. Free cyanide ions and total cyanides were detected from glycine solutions using commercial test after electric current of 5A/cm2 was applied for five hours. To ascertain the electrode side at which cyanides were generated, a salt bridge was arranged between an anode chamber and a cathode chamber, consisting of glycine solution. Results show that cyanides were produced at the anode side after electric current was applied to electrodes in the chambers. These results suggest that cyanides were produced by oxidation of glycine at nickel or platinum anodes in Watts baths including glycine, which was induced by the application of electric currents. Moreover, cyanides remained on nickel electrodeposits after rinsing in water for 10min as well as electrodeposition baths. © The Electrochemical Society of Japan, All rights reserved.

Cyanide Detection from Nickel Electrodeposited in Modified Watts Baths Including Glycine and Cyanide Production at Anodic Sides in the Baths