Parameter Optimization of Cu/Co-Mo Amorphous Coating Prepared by Composite Co-deposition on Aluminum Alloy Surface.

Aluminum plays a crucial role in marine structural engineering. However, the presence of Cl⁻ in the ocean leads to erosion of the alumina film and subsequent destruction of aluminum alloy workpieces. To enhance the corrosion resistance of aluminum and improve the bonding force between the plating layer and the matrix, a Cu/Co-Mo amorphous plating layer was intentionally applied to its surface. By exploring the process parameters during the preparation process and using the polarization curves as a measure of variation, the optimum parameters for the preparation of the plated layers were obtained. The results demonstrated that the optimal process parameters were achieved with a current density of 75 mA cm⁻², temperature of 45°C, concentration of Na₂MoO₄ of 0.04 mol L⁻¹, and time of 45 min. XPS testing revealed that the oxide film formed by the plating played a crucial role in preventing further damage caused by Cl⁻. In addition, the layers prepared under the optimum process parameters are subjected to a variety of tests, including XRD, SEM, AFM, and EIS. [ABSTRACT FROM AUTHOR]