The behaviour of solid powder aluminized steel in molten SAC205 solder alloy

In this research, the behavior of solid powder aluminized CK60 steel was investigated in SAC205 type Sn-based solder melt through immersion tests with the duration of 40 days. The tested specimens were subjected to microstructure investigations to reveal any reactions. It was found that the oxide layer that forms natively on the surface of aluminized steel prevents any reaction between the steel and solder melt. However, if the native oxide layer is broken and the aluminized steel gets in contact with the solder melt, equilibrium FeSn 2 forms , which involves the dissolution of Fe atoms from the steel and phase FeSn 2 forms. No reaction was observed between the Ag and Cu alloying elements of the solder alloy and the aluminized steel.