STRIATED MORPHOLOGY DURING ELECTRODEPOSITION

Comparative study of striated morphologies obtained during the electro deposition of various metals is performed using rotating electrodes. T he formation of striation during electrodeposition of zinc, copper, an d silver follows the streamlines of the fluid, and is observed to be a ccompanied by small or negative polarization resistance. The spacings between striae depends strongly on the applied current density. The sp acing decreases with current density in the case of zinc and silver, h owever, a reverse trend is observed in the case of copper. Linear stab ility analysis shows that spatial multiplicity occurs when (partial de rivative i/partial derivative C)eta < 0. The experimentally observed s pacings between striae (0.1 similar to 1 mm) are in agreement with the wavelength obtained from the linear stability analysis. The analysis of polarization and striation data shows fairly good qualitative agree ment with respect to the effects of current density, diffusion layer t hickness, and electrolyte concentration on striation.