陽極溶解法による銅-亜鉛合金めっき物組成の決定に関する研究

概要

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The deposition of copper-zinc alloy (brass) on platinum substrates from pyrophosphate electroplating baths was investigated by potentiostatic electrolysis with respect to the effect of electrode potential on the properties of the alloy deposit. The electrodeposits were analyzed by atomic absorption spectrophotometry, X-ray photoelectron spectroscopy (XPS), X-ray diffraction analysis and for their metal element contents by anodic chronoamperometry. It was found that the quantity of electricity obtained by means of anodic chronoamperometry permitted evaluation of the content of metallic copper and zinc in the alloy deposit, since both dissolved as divalent ions in ammonium nitrate solution. In sodium cyanide solution, however, copper and zinc behaved as monovalent and divalent ions, respectively. Both zinc oxide and zinc hydroxide were always included in alloy deposit obtained at potentials more noble than -1.25V (Ag/AgCl sat. KCl) and were never found at a potential of -1.25V, but at potentials less noble than -1.25V they were included in the alloy deposits again when the deposition current and hydrogen evolution current increased.