TEXTURAL EVOLUTION IN ELECTRODEPOSITS UNDER THE INFLUENCE OF ADSORBEDFOREIGN SPECIES .1. TEXTURAL EVOLUTION IN IRON ELECTRODEPOSITS AFFECTED BY HYDROGEN CODEPOSITION

Textural evolution in electrodeposits is strongly affected by foreign species in the electrolyte and also by the co-deposition of hydrogen. The effects of foreign species on textural development in electrodepos its were studied by employing a Monte Carlo model. This model is based on physical principles and incorporates parameters which are used to control electrodeposition processes. An attempt was made in the simula tion to reflect the basic process of the deposit growth, and to identi fy the factors responsible for the texture formation and its variation with the deposition condition. It is assumed that the texture of the deposit results from the minimization of the free energy of the system . Based on this assumption, it was demonstrated that the surface-energ y anisotropy played an important role in the formation of fibre textur e. In particular, the model can be used to simulate textural evolution under the influence of adsorbed foreign species, because the surface- energy anisotropy is modified by the adsorbed foreign species. Part I of the paper presents results of our studies on iron electrodeposition with the emphasis on the effect of hydrogen adsorption on iron deposi t texture. Relevant experimental results have also been presented to c orroborate the simulation study. Part It of the paper presents simulat ion studies of textural evolution in copper deposits under the influen ce of adsorbed potassium and chloride ions.