THERMODYNAMIC ANALYSIS OF THE FORMATION OF Fe-Al-Zn INTERMETALLIC COMPOUNDS IN Al/GALVANIZED STEEL INTERFACE

doi:10.11900/0412.1961.2015.00203

Acta Metall Sin

2016, Vol. 52

Issue (1): 113-119 DOI: 10.11900/0412.1961.2015.00203

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THERMODYNAMIC ANALYSIS OF THE FORMATION OF Fe-Al-Zn INTERMETALLIC COMPOUNDS IN Al/GALVANIZED STEEL INTERFACE

Manjiao CHEN¹,Jiankang HUANG¹(

),Cuicui HE²,Yu SHI¹,Ding FAN¹

1 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2 Department of Mechanical and Electrical Engineering, Vocational Technical Institute of Langfang Yanjing, Langfang 065200, China

Cite this article:

Manjiao CHEN,Jiankang HUANG,Cuicui HE,Yu SHI,Ding FAN. THERMODYNAMIC ANALYSIS OF THE FORMATION OF Fe-Al-Zn INTERMETALLIC COMPOUNDS IN Al/GALVANIZED STEEL INTERFACE. Acta Metall Sin, 2016, 52(1): 113-119.

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Abstract

As for the intermetallic compound of Al and galvanized steel welding interface has greatly affect on welding joint, the researchers study the formation mechanism of intermetallic compound at the Al/galvanized steel interface. In order to research on Al/galvanized steel welding joint interface area, Gibbs free energy calculation model of Fe-Al-Zn intermetallic compounds formation was established based on the lattice model. Using the Gibbs free energy calculation model the formation of Fe₂Al₅Zn_x intermetallic phase was calculated and analyzed. At the Al/galvanized steel welding interface area, the calculation result was confirmed by experiments. Fe-Al-Zn ternary compound phases were formed at the welding joint interface of Al/galvanized steel. The Fe-Al-Zn compound phases, Fe₂Al₅Zn_0.4, was the most stable. The calculation results agreed well with experiment results. It is showed that the calculation model was reasonable and the method was appropriate and feasible. The calculation model could reflect the Fe-Al-Zn intermetallic compound formation at Al/galvanized steel welding joint correctly. Fe₂Al₅Zn_0.4 phase formation process could be experienced three stages based on the study of element distribution analysis at the interface center. It is also called the galvanized layer was dissolved in liquid Al, the Zn element was diffused, the Fe₂Al₅Zn_0.4 was generated based on the reaction of Zn element and intermetallic compound Fe₂Al₅.

Key words: Al/steel welding Fe-Al-Zn intermetallic compound thermodynamic analysis

Received: 07 April 2015

Fund: Supported by National Natural Science Foundation of China (No.51165023)

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	Manjiao CHEN
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	Yu SHI
	Ding FAN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00203 OR https://www.ams.org.cn/EN/Y2016/V52/I1/113

Table 1 Calculation parameters in the model^[26,27] (T—temperature)

Fig.1 Gibbs energy (G) of Fe₂Al₅Zn_x changes with different x

Fig.2 Morphologies of Al side (a) and galvanized steel side (b) of the peeled sample

Fig.3 XRD spectra of Al side and galvanized steel side of the peeled sample

Fig.4 SEM-BSE image (a) and element maps of Al (b), Fe (c), Zn (d) at interface centre of cross section of Al/galvanized steel welding-brazing

Fig.5 3D framework of Fe and Al atoms in the Fe₂Al₅ structure^[29]

Fig.6 Schematics of formation process of Fe₂Al₅Zn_0.4intermetallic compound of the first stage (a), the second stage (b), the third stage (c) and the fourth stage (d)

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