The kinetics of thin alloy film formation and growth during Cd electrodeposition onto Au(100) were studied at room temperature in 50mM H2SO4 + 1mM CdSO4 solution. Calculations of the diffusivity of Cd in the Au electrode surface, together with in situ atomic force microscopic observations and polarization experiments, showed that the overall alloying process at the Au(100)/Cd2+ interface consisted of 2 processes. One of these was very fast, occurred within 2 monolayers and was characterized by a coefficient of 10-16cm2/s. The other was much slower and was characterized by a coefficient of 10-18cm2/s; thus suggesting a solid-state process.

Diffusion at Au(100)/Cd2+ Interface during Electrodeposition. R.Vidu, S.Hara: Surface Science, 2000, 452[1-3], 229-38