Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Analysis of the Inhibition Layer of Galvanized Dual-Phase Steels

  • Wang, K.K. (Department of Materials and Optoelectronic Science, National Sun Yat-Sen University) ;
  • Wang, H.-P. (Department of Materials and Optoelectronic Science, National Sun Yat-Sen University) ;
  • Chang, L. (Department of Materials and Optoelectronic Science, National Sun Yat-Sen University) ;
  • Gan, D. (Department of Materials and Optoelectronic Science, National Sun Yat-Sen University) ;
  • Chen, T.-R. (Steel & Aluminum R&D Department, China Steel Corporation) ;
  • Chen, H.-B. (Steel & Aluminum R&D Department, China Steel Corporation)
  • Received : 2009.06.30
  • Accepted : 2012.02.24
  • Published : 2012.02.29
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Abstract

The formation of the Fe-Al inhibition layer in hot-dip galvanizing is a confusing issue for a long time. This study presents a characterization result on the inhibition layer formed on C-Mn-Cr and C-Mn-Si dual-phase steels after a short time galvanizing. The samples were annealed at $800^{\circ}C$ for 60 s in $N_{2}$-10% $H_{2}$ atmosphere with a dew point of $-30^{\circ}C$, and were then galvanized in a bath containing 0.2 %Al. X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) was employed for characterization. The TEM electron diffraction shows that only $Fe_{2}Al_{5}$ intermetallic phase was formed. No orientation relationship between the $Fe_{2}Al_{5}$ phase and the steel substrate could be identified. Two peaks of Al 2p photoelectrons, one from metallic aluminum and the other from $Al^{3+}$ ions, were detected in the inhibition layer, indicating that the layer is in fact a mixture of $Fe_{2}Al_{5}$ and $Al_{2}O_{3}$. TEM/EDS analysis verifies the existence of $Al_{2}O_{3}$ in the boundaries of $Fe_{2}Al_{5}$ grains. The nucleation of $Fe_{2}Al_{5}$ and the reduction of the surface oxide probably proceeded concurrently on galvanizing, and the residual oxides prohibited the heteroepitaxial growth of $Fe_{2}Al_{5}$.

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References

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