Abstract
The study was conducted on the effects of electrolysis and bath conditions on the surface roughness, morphology and crystal orientation of zinc electrodeposit from sulfate bath and chloride bath. (1)The surface roughness of the zinc electrodeposit from sulfate bath was increased by suppressing mass transfer of zinc through variations of electrolysis and bath conditions. (2)Under the conditions which promoted mass transfer in sulfate bath, stacked platelet crystals were formed with the (0001) basal plane of zinc hexagonal lattice parallel to the substrate or slightly oblique to the substrate. Under the conditions which suppresses mass transfer, formation of stacked platelet crystals with <1120> perpendicular to the substrate was observed. (3)From chloride bath, coarse zinc crystals were formed in the low current density range due to a low overvoltage. Roughening of the surface in the high current density range occurred in higher current density range from chloride bath than from sulfate bath. (4) The preferred orientation of the zinc electrodeposit from both of the baths coincided with PANGAROV'S theory.
