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

被引：24

作者：

Zou, Yanlong ^{[1
]}

Chen, Xia ^{[1
]}

Chen, Bin ^{[2
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH | 2018年 / 33卷 / 08期

关键词：

HIGH-STRENGTH AL; AEROSPACE APPLICATIONS; INTERMETALLIC PHASES; X ALLOYS; PRECIPITATION; STRESS; FABRICATION; EVOLUTION; EIS;

D O I：

10.1557/jmr.2018.33

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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), theta' (Al2Cu), and a few delta' (Al3Li) phases. The anode T1 phase grows and increases with the aging treatment and becomes nearly unchanged after the peak-aged. Moreover, the cathode theta' 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.

引用

页码：1011 / 1022

页数：12

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