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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Effect of diffusion on coating microstructure and
oxidation resistance of aluminizing steel
XIA Yuan(夏  原)1, YU Sheng-xue(于升学)2,1,
YAO Mei(姚  枚)2, LI Tie-fan(李铁藩)3

1. Institute of Mechanics, Chinese Academy of
Science, Beijing 100080, P.R.China;
 2. Department of Materials Engineering,
Yanshan University , Qinhuangdao 066004, P.R.China;
3. Institute of Corrosion and Protection of Metals,
Chinese Academy of Science, Shenyang 110015, P.R.China

Abstract: The effect of diffuse treatment on coating microstructure and oxidation resistance at high-temperature of hot-dip aluminum were studied by means of  TEM, SEM and XRD. The results show that, the diffusion temperature has significant effect on structure of coatings and its oxidation resistance. After diffusion at 750℃, the coating consists of thick outer surface layer (Fe2Al5+FeAl2), thin internal layer (FeAl+stripe FeAl2), and its oxidation resistance is poor. After diffusion at 950℃, the outer surface layer is composed of  single FeAl2 phase, the internal layer is composed of FeAl phase, and its oxidation resistance declines due to the occurrence of early stage internal oxidation cracks in the coating. After diffusion at  850℃, the outer surface layer becomes thinner and consists of FeAl2+Fe2Al5 (small amount), the internal layer becomes thicker and consists of  FeAl+spherical FeAl2,and the spheroidized FeAl2 phase in the internal layer and its existing in FeAl phase steadily improve the  oxidation resistance of the coating.

 

Key words: hot-dip aluminium; dip diffusion aluminum; oxidation resistance at hightemperature; surface coating; microstructure

ISSN 1672-7029
CN 43-1423/U

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