THE INVESTIGATION ON THE INTERMETALLIC LAYER OF HOT DIPPING Al-10Si ALLOY WITH 22MnB5 AND DC51 SUBSTRATE

摘要

Hot-dipping Al-Si coating of 22MnB5 steel and DC51 steel were done in molten Al-Si bath with about 10%Si for different dipping time ranging from 3 to 300 seconds, at the temperature of 660°C, 680°Cand 700°C. To study the influence of different matrix, temperature and dipping time on the intermetallic layer, the microstructure of the intermetallic layer was observed by scanning electron microscope(SEM) with energy dispersive spectroscopy(EDS). The results show that the both intermetallic layers are mainly composed of Fe_2Al_5 and Al_9Fe_2Si_2._(10) Al_9Fe_4Si_3 was found near the boundary of Fe_2Al_5 and Al-Fe-Si intermetallic layer when the dipping time up to 300s. It also shows that the growth rate of interfacial layer on the 22MnB5 substrate is bigger than the intermetallic layer on DC51 steel at the same temperature (660°C, 700°C) except 680°C in a certain time range.