Mojtaba Esmailzadeh

In this article, the parameters of Ni-Mo/Al composite coating electroplating were optimized using Taguchi method and L18 orthogonal array. The impact of annealing temperature, annealing time, electroplating current density, stirring rate of solution and Al content in the bath on the mechanical properties of Ni–Mo/Al coatings were surveyed. It was found that among all parameters, annealing at 600 oC, annealing time of 2 hours, 5 g/l Al content in the bath, current density of 30 mA/cm2 and stirring rate of 500 rpm can produce Ni-Mo/Al composite coating with better wear properties. In addition, between different factors, electroplating current density and annealing time are the most and least effective on the wear behavior, respectively. Archard’s law was established between wear and hardness for this coating in various parameters. In the final, the wear mechanism of the optimal and non-optimal composite coatings was examined. The adhesive wear was the overcoming mechanism in the optimal composite coating.