Electrodeposition of cobalt tungsten all

The present work is devoted to the replacement of chromium coatings with a particular coating that has good properties and a nonpolluting nature. Cobalt–tungsten alloys, characterized by high hardness, were prepared using an electrodeposition process. The study focused on optimizing the conditions of the plating process, including parameters such as temperature, current density, and the concentration of metal ions, alongside the critical concentration of surfactants. The surface properties of the employed cationic surfactants were analyzed through surface tension measurements at the solution/air interface, and relevant data regarding the surface and thermodynamic properties were calculated. Additionally, the alloys underwent heat treatment under a nitrogen atmosphere at 400°C. Surface morphologies of the cobalt–tungsten alloy electrodeposits were examined before and after thermal treatment. The study also evaluated the microhardness and corrosion resistance of the alloys, making comparisons with traditional chromium deposits. Overall, the findings underline the potential of cobalt–tungsten alloys as effective and environmentally friendly alternatives to chromium coatings.