Effect of Trace Cl- and Cu2+ Ions on Corrosion Behavior of 3A21 Al-alloy in Ethylene Glycol Coolant

doi:10.11902/1005.4537.2020.082

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (3): 383-388 DOI: 10.11902/1005.4537.2020.082

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Effect of Trace Cl^- and Cu²⁺ Ions on Corrosion Behavior of 3A21 Al-alloy in Ethylene Glycol Coolant

ZHAN Dongdong¹, WANG Cheng²(

), QIAN Jiyu¹, WANG Wen²^,³, ZHOU Tong¹, ZHU Shenglong²^,³^,⁴, WANG Fuhui³^,⁴

^1.Nanjing Research Institute of Electronics Technology, Nanjing 210039, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Shenyang National Laboratory for Materials Science, Shenyang 110016, China
^4.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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Abstract

In view of the corrosion of 3A21 Al-alloy in glycol coolant, this paper studied the influence of trace amounts of Cl^- and Cu²⁺ ions on the corrosion behavior of 3A21 Al-alloy in ethylene glycol-water coolant at 50 ℃ by immersion experiments and surface analysis technology. The results indicated that Cl^- ions resulted in pitting corrosion of the alloy, and the pitting corrosion susceptibility increased with the increase of the concentration of Cl^-. Cu²⁺ ions could promote the breakdown of the passive film, and react with Al resulting in a deposition of metallic Cu on the Al-alloy surface, which in turn accelerated the corrosion of Al-alloy owing to the galvanic effect. 3A21 Al-alloy took place serious corrosion owing to the overlapping effect of the breakdown of the passive film and the galvanic effect in the case of co-existence of Cl^- and Cu²⁺.

Key words: 3A21 Al-alloy ethylene glycol trace ions pitting

Received: 13 May 2020

ZTFLH:

TG178

Fund: National Natural Science Foundation of China(51531007)

Corresponding Authors: WANG Cheng E-mail: wangcheng@imr.ac.cn

About author: WANG Cheng, E-mail: wangcheng@imr.ac.cn

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Cite this article:

ZHAN Dongdong, WANG Cheng, QIAN Jiyu, WANG Wen, ZHOU Tong, ZHU Shenglong, WANG Fuhui. Effect of Trace Cl^- and Cu²⁺ Ions on Corrosion Behavior of 3A21 Al-alloy in Ethylene Glycol Coolant. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 383-388.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.082 OR https://www.jcscp.org/EN/Y2021/V41/I3/383

Fig.1 SEM morphologies of 3A21 Al-alloy after corrosion in Cl^- containing coolant: (a) 0 mg/L, (b, c) 10 mg/L, (d) 20 mg/L, (e) 50 mg/L, (f) 100 mg/L

Fig.2 XRD pattern of 3A21 aluminum alloy

Fig.3 SEM morphologies of 3A21 Al-alloy after corrosion in Cu²⁺ containing coolant: (a) 10 mg/L, (b, c) 20 mg/L, (d, e) 50 mg/L, (f, g) 100 mg/L

Fig.4 SEM morphologies of 3A21 Al-alloy after corrosion in Cl^- and 10 mg/L Cu²⁺ containing coolant: (a) 10 mg/L Cu²⁺+10 mg/L Cl^-, (b) 10 mg/L Cu²⁺+20 mg/L Cl^-, (c) 10 mg/L Cu²⁺+50 mg/L Cl^-, (d) 10 mg/L Cu²⁺+100 mg/L Cl^-

Fig.5 Mass changes of 3A21 Al-alloy: (a) Cl^-, Cu²⁺, Cl^-+10 mg/L Cu²⁺, (b) Cl^-

Fig.6 XRD patterns of corrosion products of 3A21 Al-alloy

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