Hi Affan, 

Please, divide on the current value on the area of surface electrode ( cubic, cylindrical ...) . But, it's necessary calculate the wieght of equivalent of elements which includes the alloy " compositions" ((( importmat note ::: take the present more than 1% only not less)   

Regards, 

Dear Affan

Theoretically, based on the composition of elements in the alloy, you can take a basis for electrodeposition of one gram of this alloy then the individual required current for each element is calculated based on faraday law and the total current is estimated by collecting the individual currents. The theoretical current density can be calculated by dividing the total current on the surface area of cathode. However this is a theoretical calculation and the experimental results may be entirely different due to the role of electrode potential , type of supporting electrolyte  used in the experiment, and effect of side reaction (hydrogen evolution) during the electrodeposition .

Hi Affan,

I agree with Ali: you can try to calculate theoretically... BUT you will have just little chance to reach your desired composition.

You can try an experimental approach with Hull cell. But from my point of view, the best remains to perform a complete study of the system with 3 electrodes cell, cyclic voltammetry,...

It's not so easy. First of all, you need to take Cyclic Voltammograms to find the reduction potential of each component according to the obtained peaks. Then, you should apply different current densities and record the chronopotentiograms. In order to make alloys from a multi-component metal cation mixture, the potential should surpass the reduction potential of less noble component or else, the more noble one will be reduced alone. The composition of the alloys depends on the current density. The greater the current density, the higher the content of less noble ingredient. For example, when electroplating brass, an insufficient current density can be distinguished by formation of orange color due to deposition of copper (more noble component). At an appropriate current density, copper and zinc reduce at the same time resulting in correct alloying. In fact, the color and elemental composition of the obtained alloy depends on current density.  

Regards