This dissertation electroplated Zn-Sn and Zn-Sn-Ni alloys by employing alkalescent sulfate-pyrophosphate system on electrolytic copper foil, by optimizing bath composition and composition of compound additives, and employing alkalescent low-chrome bath for passivation and silane coupling agents for closing treatment.

Electroplating Zn-Ni-Sn ternary alloy on electrolyte copper foil using alkaline salt pyrophosphate solution was investigated.

The combination properties of copper foil surface can be improved by electroplating Zn-Sn alloy on it using alkaline pyrophosphate system.

According to the analysis of the resistivity—temperature(ρ—t) curves,the obtained significant abnormal variation of the(electrical) resistivity at high temperature of Sn-Zn alloys is considered.

Powders of Sn-Zn alloys with different Zn contents were prepared.

Sn-Zn alloy is a candidate for the traditional lead-tin solder substitute.

By introducing amino acid additives in the pyrophosphate plating bath,the Sn-Ni alloy coating containing 67% Sn(mass fraction),having similar color to Ni coating and excellent corrosion resistance as well,was prepared using electro-deposition.

The effect of process parameters such as current density,time,temperature,pH value,mixing method on the electric resistance and wear resistance of the gun colour Sn-Ni alloy coating were studied by orthogonal test,and the optimum process parameters were determined as follows: current density,0.

An ab initio method with the first-principles plane-wave pseudopotentials based on the density functional theory has been used to calculate the physical character and electrochemical performance of various alloy phases in Sn-Ni alloy.