Influence of Quench Rate on Exfoliation Corrosion Resistance of Rolled 7020 Al-alloy Plate

doi:10.11901/1005.3093.2017.464

Chinese Journal of Materials Research

2018, Vol. 32

Issue (6): 423-431 DOI: 10.11901/1005.3093.2017.464

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Influence of Quench Rate on Exfoliation Corrosion Resistance of Rolled 7020 Al-alloy Plate

Shengdan LIU^1,^2,³, Chen GUO^1,², Lingying YE^1,^2,³(

), Zhenshen YANG^1,², Yunlai DENG^1,^2,³

1 School of Materials Science and Engineering, Central South University, Changsha 410083, China
2 Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China
3 Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Changsha 410083, China

Cite this article:

Shengdan LIU, Chen GUO, Lingying YE, Zhenshen YANG, Yunlai DENG. Influence of Quench Rate on Exfoliation Corrosion Resistance of Rolled 7020 Al-alloy Plate. Chinese Journal of Materials Research, 2018, 32(6): 423-431.

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Abstract

The influence of quench rate after solution treatment on the exfoliation corrosion resistance of the rolled 7020 Al-alloy plate was studied by means of standard exfoliation corrosion immersion tests and electrochemical impedance spectroscope (EIS) technique, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) technique and scanning transmission electron microscopy (STEM). Results showed that the exfoliation corrosion resistance of this alloy plate decreases with quench rate decreasing from 1800℃/min to 38℃/min. Correspondingly, the corrosion-ranking of the alloy degrades from EA to EB+, while the maximum corrosion depth increases from 388 μm to 570 μm. The relevant mechanism was discussed based on the effect of quench rate on the changes in the size, the number, the spacing and the microchemistry of grain boundary precipitates as well as the width of precipitate free zone.

Key words: metallic materials 7020 aluminum alloy quench rate exfoliation corrosion grain boundary precipitate precipitate free zone

Received: 30 July 2017

ZTFLH:

TG146

Fund: Supported by Hunan Science and Technology Major Project (No. 2016GK1004) and Shenghua Yuying Project of Central South University (No. 20130603) and the National Key Research and Development Program of China (No. 2016YFB0300901)

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	Shengdan LIU
	Chen GUO
	Lingying YE
	Zhenshen YANG
	Yunlai DENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.464 OR https://www.cjmr.org/EN/Y2018/V32/I6/423

Table 1 Chemical compositions of 7020 aluminum alloy (%, mass fraction)

Fig.1 SEM images of (a) room temperature water, (b) boiling water (c) air quenched 7020 aluminum alloy after immersion in EXCO solution for 30 minutes

Fig.2 Corrosion morphologies of 7020 aluminum alloy quenched in (a) room temperature water, (b) boiling water and (c) air after immersion in EXCO solution for 12 h and 48 h

Fig.3 Cross-sectional images of 7020 aluminum alloy quenched in (a) room temperature water, (b) boiling water and (c) air after immersion in EXCO solution for 48 h

Table 2 Electrochemical parameters of the equivalent circuit and corresponding maximum corrosion depth

Fig.4 (a) Nyquist plot of 7020 aluminum alloy in EXCO solution, (b) equivalent circuit

Fig.5 Inverse pole figure maps of 7020 aluminum alloy (a) ND-RD section, (b) TD-RD section

Fig.6 STEM images of 7020 aluminum alloy quenched in (a) room temperature water, (b) boiling water and (c) air

Fig.7 STEM images of 7020 aluminum alloy quenched in (a) room temperature water, (b) boiling water and (c) air

Fig.8 Statistics of (a) the size and (b) spacing of the grain boundaries precipitates and (c) the width of precipitate free zone

Fig.9 Variations of the contents of Zn, Mg, Cu elements in grain boundary precipitates

Fig.10 Schematic diagrams of corrosion process development in (a) fast-quenched and (b) slowly-quenched 7020 aluminum alloy

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