Abstract
AbstractComposite Zn + Ni coatings were obtained by electrodeposition of Zn with Ni particles on a steel substrate from a zinc chloride based electrolyte in which metallic Ni powder was suspended by mechanical stirring. The deposition was carried out under galvanostatic conditions. The effect of the metal powder amount in the bath, as well as the deposition current density, on the content of incorporated Ni particles in the coatings was investigated. The deposits have been characterized by the presence of Ni particles embedded into the crystalline Zn matrix. The mechanism of metallic particles' embedding was explained on the base of Zn2+ ions adsorption process. The surface morphology of the obtained coatings was investigated by SEM method.The deposited composite coatings were subjected to the thermal treatment in order to carry out the reaction in the solid state between the zinc matrix and incorporated Ni particles and to reach the better homogeneity of the examined material.The corrosion resistance properties of Zn and Zn + Ni coatings in 5% NaCl solution were compared by examining the results acquired through Stern method and electrochemical scanning methods. The corrosion potential Ecorr, corrosion current density icorr and polarization resistance Rp have been determined, as a measure of corrosion resistance. Copyright © 2010 John Wiley & Sons, Ltd.
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