E. A. Karfidov, E. V. Nikitina, N. A. Kazakovtsevа, V. B. Malkov, N. G. Molchanovа.
ABSTRACT:
The effect of temperature in the range from 350 to 650°С on the morphology of brass grade L63 (37 wt % Zn) was studied during selective anodic dissolution in the eutectic salt melt of lithium, cesium and potassium chlorides. Anodic polarization is accompanied by a change in the state of the surface of the electrodes in connection with the release into the corrosive medium of the electronegative component of the alloy–zinc, as well as the vacancy-induced rearrangement of the electropositive component, copper. The methods of investigation used in this work: microscopy, gravimetry, chemical analysis, and hydrostatic weighing-allowed us to evaluate the patterns of formation of a developed anodic surface under the galvanostatic regime of electrochemical dissolution of a bimetallic alloy. The increase in temperature led to a decrease in the selectivity of dissolution of the alloy, porosity and development of the surface of the resulting materials.
KEYWORDS:
copper alloys, brass, selective dissolution, temperature, porosity, selectivity, developed anodic surface, chloride melt
DOI: 10.1134/S0235010618060026