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Volta potential analysis of intermetallics in 7A52 aluminum alloy

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Abstract

In order to study the effect of intermaetallics on the corrosion behaviour of 7A52 aluminum alloy, the alloy was characterized by means of SEM-EDS and scanning Kelvin probe force microscopy(SKPFM). The experimental results indicate that there are two different intermetallics:Al-Mn-Fe and Mg2Si. Both intermetallics exhibite the negative volta potential relative to the matrix indicating an anodic behaviour. Hereby, they are easy to be dissolved and corroded under the erosive environment, and there become the corrosion initiation sites. The Al-Mn-Fe intermetallics show stronger anodic behaviour than those of Mg2Si intermetalics. It means that Al-Mn-Fe intermetalics are easier to be corroded.

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Authors and Affiliations

  1. National Defense Key Laboratory for Remanufacturing Technology, Academy of Armored Force Engineering, Beijing, 100072, China

    Ping Zhang  (张平), Junjun Zhao & Zhihai Cai

  2. Department of Mechanical Engineering, Academy of Armored Force Engineering, Beijing, 100072, China

    Qi Li

Authors
  1. Ping Zhang  (张平)
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  2. Qi Li
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  3. Junjun Zhao
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  4. Zhihai Cai
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Correspondence to Ping Zhang  (张平).

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Funded by the National Natural Science Foundation of China(No. 50801066)

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Zhang, P., Li, Q., Zhao, J. et al. Volta potential analysis of intermetallics in 7A52 aluminum alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 27, 227–230 (2012). https://doi.org/10.1007/s11595-012-0442-2

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  • DOI: https://doi.org/10.1007/s11595-012-0442-2

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