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Anticorrosion behavior of ultrafine-grained Al-26 wt% Si alloy fabricated by ECAP

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Abstract

Ultrafine-grained (UFG) Al-26 wt% Si alloy was obtained through multipass equal-channel angular pressing (EACP) procedure and subsequently tested in 3.5 wt% NaCl solution for the evaluation of electrochemical corrosion. The results show that the ECAPed alloy with increased number of pressing passes obtain lower mass-loss ratios, nobler E corr and E pit, lower I corr values, and higher anode polarization. The improved corrosion resistance of the ECAPed alloy results from the homogeneous UFG structure with the breakage of brittle large primary silicon crystals, which contributes to a higher pitting resistance. The oxidation product with improved adhesion force and protection efficacy can be formed with greater ease on UFG alloys. It implies that grain refinement through severe-plastic-deformation can enhance anticorrosion behavior of hypereutectic Al–Si alloys, besides the well-known strengthening and toughening effects.

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Acknowledgements

This study was supported by National Natural Science Foundation of China (Grant No. 51141002) and the Fundamental Research Funds for the Central Universities (Hohai University No. 2009B15314).

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Authors and Affiliations

  1. College of Mechanics and Materials, Hohai University, Nanjing, 210098, China

    Jinghua Jiang, Aibin Ma, Dan Song, Donghui Yang, Jun Shi, Kaile Wang, Liuyan Zhang & Jianqing Chen

  2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety (Changzhou Hohai Technology Co., Ltd), Changzhou, 213164, China

    Jinghua Jiang, Aibin Ma, Dan Song & Jianqing Chen

  3. Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695-7919, USA

    Donghui Yang

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  1. Jinghua Jiang
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  2. Aibin Ma
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  3. Dan Song
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  5. Jun Shi
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Correspondence to Jinghua Jiang or Aibin Ma.

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Jiang, J., Ma, A., Song, D. et al. Anticorrosion behavior of ultrafine-grained Al-26 wt% Si alloy fabricated by ECAP. J Mater Sci 47, 7744–7750 (2012). https://doi.org/10.1007/s10853-012-6703-9

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  • DOI: https://doi.org/10.1007/s10853-012-6703-9

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