MULTILAYER ELECTROGALVANIZING OF STEEL STRIP AT HIGH CURRENT DENSITY: DEPOSITION MECHANISMS, COATING MORPHOLOGY AND CORROSION BEHAVIOUR

High current density electrodeposition mechanisms of monolayer and multilayer coatings of Zn and Zn/Cr/CrOx were investigated. The effects of plating bath chemistry, temperature, current density, and relative velocity betweens trip and electrolyte were examined in the laboratory. Dependence between current density and Reynolds number resulting in an optimum structure and a coating with high corrosion resistance was evaluated.