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Effect of Magnesium Content on the Corrosion Behaviors of Grf/Al Composite

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Abstract

Graphite-fiber-reinforced aluminum composites (Grf/Al) with different magnesium content were fabricated with the pressure infiltration method. Their corrosion behaviors were investigated by potentiodynamic polarization measurements, immersion tests, electrochemical impedance spectroscopy (EIS) analysis, and scanning electron microscopy (SEM). Both the corrosion potential (E corr) and the pitting potential (E pit) decreased with the increase of magnesium content, whereas the corrosion current density (i corr) decreased sharply at first and then increased slightly. The i corr of Grf/Al-3.2Mg was the lowest among the four composites with different magnesium contents, which indicated that Grf/Al-3.2Mg had the best corrosion resistance. EIS showed that the capacitive reactance of Grf/Al-8.5Mg was 1682 Ω × cm−2, which was the worst, whereas that of Grf/Al-3.2Mg was 3498 Ω × cm−2, which was the best. SEM results revealed that magnesium and silicon formed the Mg2Si phase in Grf/Al-3.2Mg, which hindered the extension of corrosion crack and improved the corrosion resistance.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Xu Wang (PhD Student), Guoqin Chen (Lecturer), Wenshu Yang (Master’s Student), Qiang Guo (PhD Student), Gaohui Wu (Professor) & Daming Jiang (Professor)

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  1. Xu Wang
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  2. Guoqin Chen
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  3. Wenshu Yang
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  5. Gaohui Wu
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  6. Daming Jiang
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Correspondence to Xu Wang.

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Manuscript submitted May 10, 2010.

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Wang, X., Chen, G., Yang, W. et al. Effect of Magnesium Content on the Corrosion Behaviors of Grf/Al Composite. Metall Mater Trans A 41, 3458–3462 (2010). https://doi.org/10.1007/s11661-010-0509-7

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