A kinetic study on the electrodeposition of Fe-Zn-P ternary alloys

A kinetic study of electrodeposition of an Fe-Zn-P ternary alloy on steel in a chloride solution was carried out using a rotating disc geometry. The deposition rates of iron and zinc on steel are controlled by the rates of both electrochemical reaction and mass transfer through a diffusion layer, and that of phosphorus is controlled by the rate of electrochemical reaction. Zinc content in the Fe-Zn-P alloy increases with increased stirring speed and voltage, however, iron content decreases with increased stirring speed and voltage. Phosphorus content is almost constant with an increase of stirring speed in lower voltage ranges and decreases slightly with increased stirring speed in the higher voltage ranges.