摘要
After diffusion processing of thermal spraying , aluminum on 20^# steel is discussed in this article. Variations of microstructure, composition as well as mierohardness and corrosion resistatwe of diffusion layer of spray aluminum were explored by means of X-ray diffraction, scanning electron microscopy （SEM） and electron probe microanlysis （ EPMA ） . The result shows that the diffusion layer of spray aluminum consists of η phase （ Fe2Al5 ）, ξ phuse （ FeAl2 ）, β2 phase （ FeA1 ）,β1 plmse （ Fe3Al ） and α pluse from surface to substrate. There are balanced transitions between phases. The layer has extra high hardness and corrosion resistance.
After diffusion processing of thermal spraying , aluminum on 20^# steel is discussed in this article. Variations of microstructure, composition as well as mierohardness and corrosion resistatwe of diffusion layer of spray aluminum were explored by means of X-ray diffraction, scanning electron microscopy （SEM） and electron probe microanlysis （ EPMA ） . The result shows that the diffusion layer of spray aluminum consists of η phase （ Fe2Al5 ）, ξ phuse （ FeAl2 ）, β2 phase （ FeA1 ）,β1 plmse （ Fe3Al ） and α pluse from surface to substrate. There are balanced transitions between phases. The layer has extra high hardness and corrosion resistance.
