DISSOLUTION BEHAVIOR OF BRASS POLARIZED BY ALTERNATING CURRENT IN SODIUM PHOSPHATE AQUEOUS SOLUTION

Аннотация

The electrochemical behavior of Cu-Zn alloy (brass) polarized with industrial - frequency alternating
current has been studied for the first time in aqueous sodium phosphate solution. The effects of current density in
brass (200-1200 A/m2
) and titanium (20-120 kA/m2
) electrodes, sodium phosphate solution concentration (0,5-2,0
M), alternating current (AC) frequency (30-180 Hz) and electrolysis duration (0,25-1,5 h) on the alloy dissolution
current efficiency were considered.
Intensive brass dissolution by forming copper (II) and zinc (II) ions during the electrolysis in alternating current
mode was shown for the first time. In the case of direct current (DC) electrolysis, the current output value of alloy
electrochemical dissolution was very low. As the current density of the alternating current polarized brass electrode
was increased, the current output rate of the alloy dissolution increased initially and decreased to 400 A/m2
, where
(400 A/m2
) alternating current value comprised 80% in an optimal condition. When the titanium electrode current
density was increased, the brass dissolution current efficiency showed a maximum value; the current output of Cu
(ІІ) and Zn (ІІ) ions formation at current 60 кА/m2 density was 50% and 30%, respectively. As the electrolysis
duration and the AC frequency are increased, the brass electrode current efficiency is reduced.
On the basis of obtained results, the potential of copper and zinc phosphate synthesis was shown.