INFLUENCE OF PERIODIC CURRENTS ON COPPER ELECTROCRYSTALLIZATION

Electron microscopy and X-ray diffraction were used to study the influ ence of the periodic-current parameters (its density, frequency, pulse duty factor) and of temperature of the acidic sulfate bath on the str ucture of electrolytic copper deposits. It was shown that the lattice parameter increases, while the deformation field strength and lattice microdistortions decrease when asymmetric alternating current with a l arge amplitude of the reverse current pulses is used. It was establish ed that the dislocation density decreases and the size of the regions of coherent blocks in the substructure of the cathodic deposits increa ses when current pulses of alternating polarity, a frequency of more t han 20-30 Hz, and an off-on ratio of 1.25-2.0 are used.