Corrosion Behavior of Al-Mg-RE Alloy Wires Subjected to Different Cold Drawing Deformation

doi:10.11902/1005.4537.2019.201

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (5): 432-438 DOI: 10.11902/1005.4537.2019.201

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Corrosion Behavior of Al-Mg-RE Alloy Wires Subjected to Different Cold Drawing Deformation

ZHANG Xin¹^,²(

), YANG Guangheng¹, WANG Zehua¹, CAO Jing¹, SHAO Jia¹, ZHOU Zehua¹

1 College of Mechanics and Materials, Hohai University, Nanjing 211100, China
2 Ocean and Offshore Engineering Research Institute, Hohai University, Nantong 226300, China

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Abstract

Al-Mg alloys are considered as the ideal electromagnetic shielding materials and widely applied on electronic and communication servicing in marine environment due to their excellent comprehensive properties, such as high specific strength, low electric resistivity and excellent corrosion resistance. The microstructure and corrosion behavior of Al-3.0%Mg-0.12%RE alloy wires subjected to different cold drawing deformation was investigated by means of optical microscope (OM), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and electrochemical measurement. The influence of cold-drawing strain and microstructure on corrosion resistance of the alloy was also examined. The results indicated that the equiaxed grains of the alloys were elongated and the skeletal second phase particles were fragmented during the cold-drawing process. The corrosion behavior of the Al-3.0%Mg-0.12%RE alloy showed typical characteristics of pitting corrosion at the position of second phases. With the increase of strain, the uniform corrosion sensibility increased, pitting corrosion sensibility declined and the corrosion resistance of the alloy improved.

Key words: Al-3.0%Mg-0.12%RE alloy cold drawing process corrosion behavior pitting corrosion

Received: 13 November 2019

ZTFLH:

TG174

Fund: Nantong Municipal Science and Technology Project(JC2018047);Fundamental Research Funds for the Central Universities(2018B02514)

Corresponding Authors: ZHANG Xin E-mail: zhangxin.007@163.com

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Cite this article:

ZHANG Xin, YANG Guangheng, WANG Zehua, CAO Jing, SHAO Jia, ZHOU Zehua. Corrosion Behavior of Al-Mg-RE Alloy Wires Subjected to Different Cold Drawing Deformation. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 432-438.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.201 OR https://www.jcscp.org/EN/Y2020/V40/I5/432

Fig.1 Sample casting of Al-3.0%Mg-0.12%RE alloys

Fig.2 Diagrammatic sketch of drawing machine

Fig.3 Diagrammatic sketchs of sample option for structure analysis and corrosion test

Fig.4 Optical image (a), SEM image (b) and EDS analysis of Fe (c), Al (d), Mg (e), Ce (f) and La (g) of Al-3.0%Mg-0.12%RE alloy

Fig.5 Microstructure of Al-3.0%Mg-0.12%RE alloy with different strain: (a) 51%; (b) 64%; (c) 75%; (d) 84%; (e) 91%; (f) 96%

Fig.6 Second phase micrographs of Al-3.0%Mg-0.12%RE alloys with different strain: (a) 51%; (b) 64%; (c) 75%; (d) 84%; (e) 91%; (f) 96%

Fig.7 Surface morphologies (a, b) and EDS analysis (c, d) of as-cast Al-3.0%Mg-0.12%RE alloys after the 21 d immersion test in 3.5%NaCl solution

Fig.8 Surface morphologies of Al-3.0%Mg-0.12%RE alloys with different strains after 21 d immersion test: (a) 51%, (b) 64%, (c) 75%, (d) 84%, (e) 91%, (f) 96%

Fig.9 Potentiodynamic polarization curves of Al-3.0%Mg-0.12%RE alloys with different strain

Table 1 E_corr and E_pit valus of Al-3.0%Mg-0.12%RE alloys with different strains

Fig.10 Nyquist diagram of Al-3.0%Mg-0.12%RE alloys with different strains

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