Effect of Minor Zr Addition on Exfoliation Corrosion Resistance of Al-Zn-Mg-Mn Alloy Sheet

doi:10.11901/1005.3093.2018.715

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 488-496 DOI: 10.11901/1005.3093.2018.715

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Effect of Minor Zr Addition on Exfoliation Corrosion Resistance of Al-Zn-Mg-Mn Alloy Sheet

Wenru CHAI^1,²,Jingchao CHEN^1,²,Shengdan LIU^1,^2,³(

),Lingying YE^1,^2,³,Huaqiang LIN⁴,Xinming ZHANG^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
4. National Engineering Research Center for High-speed EMU, CRRC Qingdao Sifang Co. Ltd. , Qingdao 266000, China

Cite this article:

Wenru CHAI,Jingchao CHEN,Shengdan LIU,Lingying YE,Huaqiang LIN,Xinming ZHANG. Effect of Minor Zr Addition on Exfoliation Corrosion Resistance of Al-Zn-Mg-Mn Alloy Sheet. Chinese Journal of Materials Research, 2019, 33(7): 488-496.

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Abstract

The effect of minor Zr addition on exfoliation corrosion resistance of Al-Zn-Mg-Mn alloy sheet was studied by means of standard exfoliation corrosion immersion tests and electrochemical impedance spectroscope (EIS) technique combined with optical microscopy (OM), electron back scattering diffraction (EBSD) technique and scanning transmission electron microscopy (STEM). The results showed that due to the addition of Zr the exfoliation corrosion resistance of Al-Zn-Mg-Mn alloy sheet is significantly improved, correspondingly, the maximum corrosion depth decreases from 593 μm to 421 μm and the exfoliation corrosion rating changes from EB to EA. The relevant mechanism was discussed based on the difference of grain structure and the changes of the size, spacing and microchemistry of η precipitates at grain boundaries and the width of precipitate free zone.

Key words: metallic materials Al-Zn-Mg alloy exfoliation corrosion Zr microstructure grain boundary precipitate

Received: 18 December 2018

ZTFLH:

TG146

Fund: National Key Research and Development Program of China(2016YFB0300901);Key Project of Science and Technology of Hunan Province(2016GK1004);Shenghua Yuying Project of Central South University(20130603)

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	Wenru CHAI
	Jingchao CHEN
	Shengdan LIU
	Lingying YE
	Huaqiang LIN
	Xinming ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.715 OR https://www.cjmr.org/EN/Y2019/V33/I7/488

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

Fig.1 Grain orientation maps in RD-ND section of (a) Al-Zn-Mg-Mn sheet and (b) Al-Zn-Mg-Mn-Zr sheet, (c) color coded map type: inverse pole figure [001] (RD: rolling direction, ND: normal direction)

Table 2 Grain structures of two test sheets

Fig.2 Vertical section phase diagram of Al-4.3%Zn-1.2%Mg-0.28%Mn-x%Zr alloy

Fig.3 HAADF-STEM image of Al-Zn-Mg-Mn-Zr sh-eet after solution heat treatment

Fig.4 HAADF-STEM images of GBs of (a) Al-Zn-Mg-Mn sheet and (b) Al-Zn-Mg-Mn-Zr sheet

Fig.5 Histograms of (a) size and (b) spacing of grain boundaries precipitates, (c) precipitate free zone width

Table 3 Results of grain boundary characteristics

Fig.6 HAADF-STEM image of Al-Zn-Mg-Mn-Zr sheet

Fig.7 Digital images of the surfaces of two sheets after immersion in EXCO solution for 2 h and 48 h (RD: rolling direction, TD: transverse direction)

Fig.8 Optical micrographs of the cross sections of (a) Al-Zn-Mg-Mn and (b) Al-Zn-Mg-Mn-Zr sheets after immersion in EXCO solution for 48 h

Table 4 Results of exfoliation corrosion and electrochemical parameters

Fig.9 Nyquist (a), Bode plots (b) and (c) equivalent circuit model of two tested sheets immersed in EXCO solution

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