When Zn-Sn-Ni ternary alloy is electroplated on electrolyte copper foil, the surface
properties can be comprehensively improved by using alkaline salt pyrophosphate solution. After
the bath composition and processing conditions are optimized, and an appropriate additive is chosen,
the SEM images shows the electrocrystalized substance obtained is composed of nano-crystals.
Besides, XRD analysis on the deposits of electroplated Zn-Sn-Ni alloy shows Zn in the deposits
exist in the form of metal compound, including δ phase Ni3Zn22 as well as γ Ni5Zn21. This indicates
under the pyrophosphate salt the process of nucleation of Zn-Sn-Ni ternary alloy is similar to the
process of three-dimensional successive nucleation controlled by diffuseness. All these demonstrate
that after the disposal of this study, the corrosion resistance, the heat resistance and the binding
intensity of electrolyte copper foil are obviously improved.