Abstract
The effect of deposition potential on the electrodeposition, composition, surface characteristics and corrosion resistance properties of Zn-Ni-Mn alloy coatings were investigated. During the deposition potential range from -0.500 to -1.000 V, normal codeposition of the alloy components occurred, meanwhile at deposition potentials more cathodic than -1.000 V, the anomalous codeposition took place. Shifting the deposition potentials toward the negative direction led to an increase in the thickness of the deposit, incremented the adhesion and compactness and improved the corrosion resistance properties. X-ray diffraction studies of the deposit showed the presence of hexagonal pure Zn phase, hexagonal Mn0.27Zn0.73 phase and cubic gamma-Ni5Zn21 and/or tetragonal delta-Ni3Zn22 phases.