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Effect of aging on the corrosion behavior of 6005 Al alloys in 3.5 wt% NaCl aqueous solution

Published online by Cambridge University Press:  15 May 2018

Wenkai Li ,
Xia Chen  and
Bin Chen Open the ORCID record for Bin Chen [Opens in a new window]
Wenkai Li
Affiliation:
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; and School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xia Chen
Affiliation:
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Bin Chen*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of aging time on the corrosion behavior of 6005 Al alloys has been investigated in aerated 3.5% NaCl aqueous solution. The corrosion resistance of the alloy with different aging times is analyzed by measuring potentiodynamic polarization, electrochemical impedance spectroscopy. The surface morphology is examined by scanning electron microscopy. The results demonstrated that the corrosion resistance of the alloy in the peak-aged condition is worse than the other conditions. Accordingly, corrosion rate and the corrosion current density of the alloy reach its maximum value. An Fe-rich phase is identified as the β-Al4.5FeSi phase by atomic-resolution high angle annular dark field scanning transmission electron microscopy and energy dispersive X-ray spectroscopy mapping analyses. The β-Al4.5FeSi is wrapped slowly by the precipitates of Mg2Si from the process of the peak-aged condition to the over-aged condition. It is hypothesized that the change of corrosion behavior of the alloy may be attributed to the β-Al4.5FeSi wrapped slowly by the precipitates of Mg2Si.

Keywords

aluminum alloyaging timecorrosion resistancepolarizationmicrostructure
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1830 - 1838
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Copyright
Copyright © Materials Research Society 2018 

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