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Comparison of the corrosion and stress-corrosion behavior of a ternary Al-Zn-Mg alloy

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Abstract

A comparison has been made of the corrosion and stress-corrosion behavior of an aged Al-5.3 wt pet Zn-2.5 wt pct Mg alloy in aqueous chloride solutions of varying pH (i.e., 1 to 6.2). It is found that lowering the pH to values 〈4 accelerates corrosion in the absence of stress, due to enhancement of the overall cathodic process, and accelerates the propagation of stress-corrosion cracks. However, the pH dependence of cracking is not as marked as the pH dependence of corrosion rate, and this difference has been explained in terms of local variations in pH within the crack. It is concluded that the present observations are consistent with the view that the propagation of stress-corrosion cracks in this metal-environment system involves localized anodic dissolution of the plastically deforming solid solution within the precipitate-free zone.

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Authors and Affiliations

  1. Research Institute for Advanced Studies, Martin Marietta Corp., Baltimore, Md.

    A. J. Sedriks (Acting Head of Materials Science Department), J. A. S. Green (Research Scientist) & D. L. Novak (Research Assistant)

Authors
  1. A. J. Sedriks
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  2. J. A. S. Green
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  3. D. L. Novak
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Sedriks, A.J., Green, J.A.S. & Novak, D.L. Comparison of the corrosion and stress-corrosion behavior of a ternary Al-Zn-Mg alloy. Metall Trans 1, 1815–1819 (1970). https://doi.org/10.1007/BF02642776

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  • DOI: https://doi.org/10.1007/BF02642776

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