Structure and Performances of 7075 Aluminum Alloy Surface Subject to Hot-Dip Zinc

Na Xu; Xiao Yang Qiao; Xu Yang; Yong Cun Li; Hai Zhi Li; Wei Ping Tong

doi:10.4028/www.scientific.net/KEM.727.224

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Structure and Performances of 7075 Aluminum Alloy...

Structure and Performances of 7075 Aluminum Alloy Surface Subject to Hot-Dip Zinc

Abstract:

The hot-dip galvanized coating was produced on the 7075 aluminum alloy plate by immersion in a pure zinc bath at different temperature from 440°C to 470°C for different modification time (between 1 min and 10 min). The hot-dip galvanized of the treated and un-treated samples were investigated by using scanning electron microscopy (SEM) with EDX analysis, X-ray diffraction (XRD), hardness measurements and potentiodynamic polarization curves. There were three layers fabricated on the 7075 substrate surface, specifically, zinc-rich layer, two-phase mixed layer Al-Zn and interdiffusion layer. Moreover, the 7075 aluminum alloy with the hot-dip galvanized coating exhibit higher hardness and better anti-corrosion properties in comparison with the 7075 substrate.

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

224-232

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.224

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Online since:

January 2017

Authors:

Na Xu, Xiao Yang Qiao, Xu Yang, Yong Cun Li, Hai Zhi Li, Wei Ping Tong

Keywords:

7075 Al Alloy, Corrosion Resistance, Hardness, Hot-Dip Zinc

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