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Microstructure and Oxidation of 55%Al-Zn-Si Hot-Dip Coatings Deposited on Low Carbon Steel at High Temperature

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Abstract:

The high temperature oxidation and microstructure evolution of 55%Al-Zn-Si coated sheets were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). After oxidation, the coatings consisted of three phases including ZnO, Fe2Al5, and FeAl from topcoat to the substrate. The different diffusion rate of Fe and Al result in forming voids at the interface of intermetallic layer and the substrate. A good agreement has been reached between the experimental data and the calculation from Chou diffusion model, which has a good predicted function. Moreover, the characteristic oxidation time and the apparent activation energy were obtained.

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Periodical:

Advanced Materials Research (Volumes 399-401)

Pages:

1998-2003

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.399-401.1998

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Online since:

November 2011

Authors:

Biao Zhou, Feng Jin, Qun Luo, Qian Li, Kuo Chih Chou

Keywords:

Hot-Dipped 55%Al-Zn-Si Alloy Coating, Microstructure, Oxidation Kinetics

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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