Effect of Zn Content on Exfoliation Corrosion Resistance of Al-Zn-Mg-Cu Alloy Extruded Rod

doi:10.11901/1005.3093.2018.740

Chinese Journal of Materials Research

2019, Vol. 33

Issue (8): 579-587 DOI: 10.11901/1005.3093.2018.740

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Effect of Zn Content on Exfoliation Corrosion Resistance of Al-Zn-Mg-Cu Alloy Extruded Rod

Zhenshen YANG^1,²,Shengdan LIU^1,^2,³(

),Jianguo TANG^1,^2,³,Lingying YE^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, Central South University, Changsha 410083, China
3. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China

Cite this article:

Zhenshen YANG, Shengdan LIU, Jianguo TANG, Lingying YE. Effect of Zn Content on Exfoliation Corrosion Resistance of Al-Zn-Mg-Cu Alloy Extruded Rod. Chinese Journal of Materials Research, 2019, 33(8): 579-587.

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Abstract

The effect of Zn content on exfoliation corrosion resistance of extruded rods of Al-Zn-Mg-Cu alloy was investigated by standard exfoliation corrosion (EXCO) immersion test, and polarization curve measurement, optical microscopy (OM), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). The results show that exfoliation corrosion resistance of the rods decreases with the increase of Zn content (mass fraction,%) from 7.93% to 9.85%, and the exfoliation corrosion rating changes from EA to EC with the maximum corrosion depth increasing from 334 μm to 579 μm. The lower EXCO resistance caused by higher Zn content is mainly attributed to the increased number of coarse second phase in alloys, the decreased size and spacing, as well as the higher Zn and Mg content of η-phase at grain boundaries after aging.

Key words: metallic materials Al-Zn-Mg-Cu alloy exfoliation corrosion Zn content grain boundary η phase

Received: 03 January 2019

ZTFLH:

TG146

Fund: Supported by Foundation:National Key Research and Development Program of China(No. 2016YFB0300901);Shenghua Yuying Project of Central South University(No. 20130603)

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	Zhenshen YANG
	Shengdan LIU
	Jianguo TANG
	Lingying YE

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.740 OR https://www.cjmr.org/EN/Y2019/V33/I8/579

Table 1 Chemical composition of the studied aluminum alloy extruded rods (%, mass fraction)

Fig.1 Digital photos of the surfaces of (a, a') 1#, (b, b') 2# and (c, c') 3# alloys after immersion in EXCO solution for (a, b, c) 12 h and (a', b', c') 48 h (ED: Extrusion direction)

Fig.2 Optical micrographs of the cross sections of (a) 1#, (b) 2# and (c) 3# alloys after immersion in EXCO solution for 48 h, (d) the magnified image of solid line box region in Fig.2c

Fig.3 The corrosion rating of the three alloys after immersion for different time (a) and the maximum corrosion depth of the three alloys after immersion for 48 h (b)

Fig.4 Polarization curves of the three alloys

Table 2 The electrochemical parameters of the three alloys

Fig.5 SEM images of (a) 1#, (b) 2# and (c) 3# alloys; (d) the magnified image of solid line box region in Fig.5c

Fig.6 STEM-HAADF images of grain boundaries of (a) 1# alloy, (b) 2# alloy and (c) 3# alloy

Fig.7 The average length and spacing of grain boundary particles (GBPs) and the width of PFZs in the three alloys (a) and (b) the average content of Zn, Mg and Cu elements in GBPs

Fig.8 SEM images of 2# alloy immersed in EXCO solution for (a) 0 min, (b) 20 min and (c) 80 min

Table 3 The changes of chemical composition of second phase particles in Fig.8 during immersion

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