Dissolution Mechanism and Partial Electrode Processes at Infralow Frequency AC Polarization of Brasses in Chloride Media. I. 
-Brass Cu20Zn
I. K. Marshakov, O. Yu. Kuksina, and V. Yu. Kondrashin
Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia
Received May 14, 2006
Abstract—Being typical of a steady-state anodic polarization, the uniform dissolution of 
-brass Cu20Zn is retained for the anodic half-period in the pulsed mode (f = 0.17 Hz). At such an ac polarization, the dissolution is alternated with the copper deposition in the cathodic half-periods to form a loose fine-grain deposit at the electrode. Under severe hydrodynamic conditions, no copper deposit is formed. With an increase in the current in the cathodic half-periods, the pH of a near-electrode solution layer increases, thus changing the anodic processes. Namely, the oxidation of brass components to soluble chloride complexes gives place to the formation of poorly soluble products.
-brass Cu20Zn is retained for the anodic half-period in the pulsed mode (f = 0.17 Hz). At such an ac polarization, the dissolution is alternated with the copper deposition in the cathodic half-periods to form a loose fine-grain deposit at the electrode. Under severe hydrodynamic conditions, no copper deposit is formed. With an increase in the current in the cathodic half-periods, the pH of a near-electrode solution layer increases, thus changing the anodic processes. Namely, the oxidation of brass components to soluble chloride complexes gives place to the formation of poorly soluble products.
PACS numbers: 82.45.Bb
DOI: 10.1134/S003317320702004X