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Before the heat treatment of the specimens at different temperature of 453 to 493K of temperature below melting point of tin, Cu-Zn alloys with 5, 10, 20, 30, and 38wt% of zinc content were coated by an electrodeposited tin layer of 200μm thickness. The vertical cross section of the heat treated specimens were analysed by EPMA. By the heat treatment of Cu-5 and 10wt% Zn at 453 to 493, η-phases were consisted at the interface between Cu-Zn alloy and tin. The relation of the rate of growth of the phase and the equation W=kt1/2 was clearly noticed. The temperature dependence equation of the growth rate of each layer was shown by k2=Aexp (-E/RT) (m2/s). From this experiment, the following values were obtained that the values of A=8.9×10-3, E=1.2×105 at Cu-5 wt% Zn, A=1.2 ×10-3, E=1.2×105 at Cu-10wt% Zn and A=1.5, E=1.4×105 at above 20wt% Zn. When Cu-20, 30 and 38wt% Zn and plated tin are diffused each other, the compound layer of η and β were grown and the equation W=kt1/2 was also obtained at the treatment temperature range of 453 to 483K except 493K. The temperature equation of the growth rate of compound layer of these samples was not influenced by difference of zinc content.
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