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Corrosion behavior of 2198 Al–Cu–Li alloy in different aging stages in 3.5 wt% NaCl aqueous solution

Published online by Cambridge University Press:  27 February 2018

Yanlong Zou ,
Xia Chen  and
Bin Chen
Yanlong Zou
Affiliation:
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, 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: steelboy@sjtu.edu.cn
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Abstract

In this paper, corrosion behavior of 2198 Al–Cu–Li alloy in different aging stages is investigated using immersion and electrochemical measurements in 3.5 wt% NaCl aqueous solution. The corrosion resistance is found to decrease from the solution-anneal to the peak-aged condition but increase after the peak-aged, which is due to microstructure evolution of three main kinds of precipitating phases with the aging process: T1 (Al2CuLi), θ′ (Al2Cu), and a few δ′ (Al3Li) phases. The anode T1 phase grows and increases with the aging treatment and becomes nearly unchanged after the peak-aged. Moreover, the cathode θ′ phase slightly decreases in the over-aged. The potentiodynamic polarization curves also indicate the most positive corrosion potential and the lowest corrosion current density in the peak-aged. The results of electrochemical impedance spectroscopy are in agreement with the corrosion morphologies. Furthermore, the related equivalent circuit is established to investigate the corrosion mechanism of this alloy.

Keywords

corrosionscanning electron microscopy (SEM)scanning transmission electron microscopy (STEM)
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 8 , 27 April 2018 , pp. 1011 - 1022
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Jürgen Eckert

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