Giroku Miyatani

On the interdiffusion between iron and tin at temperatures below the melting point of tin.

Specimens having an electrodeposited tin layer of tin 100μm in thickness onto the surface of pure-Fe and S15CK were heat treated at temperatures of 453-493K, below the melting point of tin. The vertical cross sections of the heat treated specimens were analysed by EPMA, showing that the growth-rate of the Fe-Sn interdiffusion layer on the S15CK matrix was faster than on pure-Fe. Fe-Sn interdiffusion coefficients for the S15CK matrix were larger than for pure Fe 453K and 473K, typically (4.8×10-9cm2/ks) about two times larger at 473K. The activation energy for the formation of the Fe-Sn interdiffusion layer was found to be 22.3kJ/mol at treatment times below 921.6ks at 453-493K for specimens of pure Fe matrix.