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| Change Rules of ��2 Particles in Hot-dipped Zn-Ti Coating |
| Yan GUI1,Qiao-yu XU2,Yan-ling GUO1 |
1. Guangzhou Panyu Polytechnic, Guangzhou 511483, Guangdong, China
2. South China University of Technology, Guangzhou 510640, Guangdong, China |
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Abstract Hot-dip Zn-Ti galvanizing can restrain the excess growth of the coating which has better corrosion resistances than hot-dip pure Zn. The change rules of ��2 intermetallic compound in hot-dip Zn-Ti galvanizing is investigated by immersion time, titanium content and the slag test using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). And the mechanism of nucleation and growth of ��2 intermetallic compound is analysed. The results show that, when adding 0. 05mass% titanium to the zinc bath, the ��2 particles form in the �� layer, which nucleate by obtaining Ti atoms from the �� phase and Fe atoms from the dissolving �� phase layer. Moreover, the more titanium is added into the bath, the more and bigger ��2 particles appear. The ��2 particles in the coatings grow up noticeably with prolonging the immersion time.
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Received: 22 November 2012
Published: 19 March 2014
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Corresponding Authors:
Yan GUI
E-mail: guiy@gzpyp.edu.cn
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2014, Vol. 21 
