Analysis of the Co-deposition of Al_2O_3 Particles with Nickel by an Electrolytic Route: The Influence of Organic Additives Presence and Al_2O_3 Concentration

摘要

Alloy coatings were prepared by co-deposition of Al_2O_3 particles in Ni matrix on carbon steel substrate from nickel chloride bath in which metallic powders were held in suspension. The influence of metal powder amount in the bath on chemical composition, morphology, thickness, microhardness and corrosion behavior of obtained coatings, has been investigated. It was shown that the presence of Al_2O_3 particles in deposit greatly improves the hardness and the wear resistance of alloy coatings. Characterization by microanalysis (EDX) of the various deposits elaborated confirms that the rate of particles incorporated increases as the concentration of solid particles increasing. The results showed that the presence of organic additives in Ni-Al_2O_3 electrolyte deposition led to an increase in the hardness and corrosion resistance of the deposits.