The anodic electrodeposition of casein on a zinc alloy was greatly influenced by the concentration, pH and temperature of the caseinate electrolytic solution. Coating was observed and analyzed using SEM, EDS and FTIR techniques. In appropriate elaboration conditions, casein coating grows in multilayers from pits where the metal dissolution process was accelerated via reactions between active functions of the adsorbed casein molecules. Study of the metal coating interface indicated that the carboxylate group of casein participates greatly in binding with zinc.