Effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol-water solution

Shu-lun Gao; Mei Yu; Jian-hua Liu; Bing Xue; Song-mei Li

doi:10.1007/s12613-017-1423-4

Volume 24 Issue 4

Apr. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(4): 423-431

Shu-lun Gao, Mei Yu, Jian-hua Liu, Bing Xue, and Song-mei Li, Effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol-water solution, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 423-431. https://doi.org/10.1007/s12613-017-1423-4

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Shu-lun Gao, Mei Yu, Jian-hua Liu, Bing Xue, and Song-mei Li, Effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol-water solution, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 423-431. https://doi.org/10.1007/s12613-017-1423-4

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Research Article

Effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol-water solution

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Corresponding author:
Mei Yu E-mail: yumei@buaa.edu.cn
Received: 20 October 2016; Revised: 12 December 2016; Accepted: 16 December 2016

Abstract

Abstract

The effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol-water solutions were studied by potentiodynamic polarization, electrochemical noise (EN), and complementary techniques including scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). A positive corrosion potential and increased corrosion current were observed due to the deposition of copper. The results demonstrate that the main corrosion type was pitting and the increasing cupric ion concentration augmented the pitting density. The pits became larger and deeper as a result of the embedment of copper into the surface of the alloy. Cupric ions were preferentially deposited at the defects around the secondary phase, leading to the formation of Al-Cu microgalvanic couples, which increased the corrosion rate. The corrosion rate gradually reached a stable value as the concentration of cupric ions was increased beyond 10 mmol/L.
- aluminum alloys;
- metal corrosion;
- cupric ions;
- ethylene glycol;
- pitting

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