EFFECT OF Mg AND TEMPERATURE ON Fe–Al ALLOY LAYER IN Fe/(Zn–6%Al–x%Mg) SOLID–LIQUID DIFFUSION COUPLES

Liu Liang, Ya-Ling Liu, Ya Liu, Hao-Ping Peng, Jian-Hua Wang and Xu-Ping Su
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Liu Liang: Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, P. R. China2Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 213164, Jiangsu, P. R. China
Ya-Ling Liu: Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, P. R. China2Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 213164, Jiangsu, P. R. China
Ya Liu: Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, P. R. China2Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 213164, Jiangsu, P. R. China
Hao-Ping Peng: Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, P. R. China2Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 213164, Jiangsu, P. R. China
Jian-Hua Wang: Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, P. R. China2Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 213164, Jiangsu, P. R. China
Xu-Ping Su: Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, P. R. China2Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, 213164, Jiangsu, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue Supp01, 1-9

Abstract: Fe/(Zn–6%Al–x%Mg) solid–liquid diffusion couples were kept at various temperatures for different periods of time to investigate the formation and growth of the Fe–Al alloy layer. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) were used to study the constituents and morphology of the Fe–Al alloy layer. It was found that the Fe2Al5Znx phase layer forms close to the iron sheet and the FeAl3Znx phase layer forms near the side of the melted Zn–6%Al–3%Mg in diffusion couples. When the Fe/(Zn–6%Al–3%Mg) diffusion couple is kept at 510∘C for more than 15min, a continuous Fe–Al alloy layer is formed on the interface of the diffusion couple. Among all Fe/(Zn–6%Al–x%Mg) solid–liquid diffusion couples, the Fe–Al alloy layer on the interface of the Fe/(Zn–6% Al–3% Mg) diffusion couple is the thinnest. The Fe–Al alloy layer forms only when the diffusion temperature is above 475∘. These results show that the Fe–Al alloy layer in Fe/(Zn–6%Al–x%Mg) solid–liquid diffusion couples is composed of Fe2Al5Znx and FeAl3Znx phase layers. Increasing the diffusing temperature and time period would promote the formation and growth of the Fe–Al alloy layer. When the Mg content in the Fe/(Zn–6%Al–x%Mg) diffusion couples is 3%, the growth of the Fe–Al alloy layer is inhibited. These results may explain why there is no obvious Fe–Al alloy layer formed on the interface of steel with a Zn–6%Al–3%Mg coating.

Keywords: Galvanization; solid–liquid diffusion; interface reaction; Fe–Al alloy layer (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X18500105

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