Microstructure and corrosion behavior of Al<sub>3</sub>Ti/ADC12 composite modified with Sr

Bao-biao Yu; Hong Yan; Qing-jie Wu; Zhi Hu; Fan-hui Chen

doi:10.1007/s12613-018-1633-4

Volume 25 Issue 7

Jul. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(7): 840-848

Bao-biao Yu, Hong Yan, Qing-jie Wu, Zhi Hu, and Fan-hui Chen, Microstructure and corrosion behavior of Al₃Ti/ADC12 composite modified with Sr, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 840-848. https://doi.org/10.1007/s12613-018-1633-4

Cite this article as:

Bao-biao Yu, Hong Yan, Qing-jie Wu, Zhi Hu, and Fan-hui Chen, Microstructure and corrosion behavior of Al3Ti/ADC12 composite modified with Sr, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 840-848. https://doi.org/10.1007/s12613-018-1633-4

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Research Article

Microstructure and corrosion behavior of Al₃Ti/ADC12 composite modified with Sr

+ Author Affiliations

Corresponding author:
Hong Yan E-mail: hyan@ncu.edu.cn
Received: 12 July 2017; Revised: 3 April 2018; Accepted: 4 April 2018

Abstract

Abstract

In this study, we investigated the effect of the addition of Sr (0wt%, 0.1wt%, 0.2wt%, and 0.3wt%) on the microstructure and corrosion behavior of Al₃Ti/ADC12 composite by optical microscopy, X-ray diffraction, scanning electron microscopy, and energy diffraction spectroscopy. The results reveal that the α-Al phases were nearly spherical and 40 μm in size and that the eutectic Si phases became round in the composite when the Sr content reached 0.2wt%. The Al₃Ti particles were distributed uniformly at the grain boundary. The results of the corrosion examination reveal that the Al₃Ti/ADC12 composite exhibited a minimum corrosion rate of 0.081 g·m^–2·h^–1 for an Sr content of 0.2wt%, which is two thirds of that of unmodified composite (0.134 g·m–2·h–1). This improved corrosion resistance was due to galvanic corrosion, which resulted from the low area ratio of the cathode to anode regions. This caused a low-density corrosion current in the composite, thereby yielding optimum corrosion resistance.
- Sr modification;
- Al₃Ti/ADC12 composite;
- microstructure;
- corrosion behavior

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