The Influence of Sodium Tungstate Concentration on the Electrode Reactions at Iron–Tungsten Alloy Electrodeposition

The investigation of Fe-W alloys is growing in comparison to other W with iron group metals due the environmental and health issues linked Ni Co materials. influence Na2WO4 concentration range 0 0.5 M on bath chemistry electrode reactions Pt alloys’ electrodeposition from citrate electrolyte was investigated by means rotating disk (RDE) cyclic voltammetry (CV) synchronized electrochemical quartz crystal microbalance (EQCM). Depending species distribution, formation becomes thermodynamically possible at potentials less than −0.87 V −0.82 (vs. Ag/AgCl). decrease mass during cathodic current pass course CV recording detected EQCM explained. overall process involving alloy may be described using formalities mixed kinetics. apparent values kinetic diffusion currents linearly depend Na2WO4. Based partial for Fe W, it concluded that codeposition occurring an autocatalytic reaction, likely via adsorbed containing compounds or nucleation clusters both surface.