The microstructure and properties of diffusion layer of spray aluminum

Abstract

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

Keywords

spray aluminum / diffusion / microstructure / composition / properties

References

[1] Sun K, Wang F P, Cao Y. A Study of the Properties of Hotdipped Aluminum Coating. Materials Science & Technology, 2002, 10(2): 193-195.

[2] Cao X Z, Cheng A Y. Structure and Performance of Hot-aluminum Impregnation. Part A: Physical Testing, 2002, 38(6): 7-9. (in Chinese)

[3] Lu Y P, Yu F Z. Aluminizing, 1985 Beijing: Mechanic Industry Press. 1-17. (in Chinese)

[4] Institute of Material Protection, Wuhan Metallic Phase Atlas of Iron Chemical and Heat Treatment, 1980 Beijing: Mechanic Industry Press. (in Chinese)

[5] Wang Y M, Ma Y M, Zhao M Q. Effect of Carbon Content on the Structures and Properties of Aluminizing Layer. Metal Heat Treatment, 1997, 10: 17-20. (in Chinese)