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Influence of the Thermomechanical Treatment on the Intergranular Corrosion Susceptibility of Zn-Modified Al-5.1 Wt Pct Mg-0.7 Wt Pct Mn Alloy Sheet

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In this study, the effect of thermomechanical treatment on intergranular corrosion (IGC) susceptibility of the Zn-modified Al-5.1 wt pct Mg-0.7 wt pct Mn alloy plates was investigated. The specimens underwent varied amounts of cold work, while final annealing was conducted in the 493 K to 533 K (220 °C to 260 °C) temperature range. It was shown that the extent of cold work, especially at lower temperatures of treatment, had a profound effect on the corrosion resistance of the alloy. Such observation was in direct correlation with the morphology of precipitated ternary grain boundary phase (Al-Mg-Zn). Microstructural characterization showed that, depending on the amount of cold work, different deformation substructures were created, which, in turn, influenced kinetics and the mechanism of precipitation. Wetting of the grain boundaries by the ternary grain boundary phase (Al-Mg-Zn) was a signature of the IGC susceptible state and occurred in the specimens that were subjected to a lower degree of cold work. The specimens that underwent a higher degree of cold work (over 30 pct) showed superior corrosion resistance as a result of ternary grain boundary phase (Al-Mg-Zn) precipitation in the form of discrete particles at the grain boundaries as well as in grain interiors.

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  1. Foerster Sigmatest 2.069 is a trademark of Foerster Instruments INC, Pittsburgh, PA.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  3. Philips CM200 is a trademark of Koninklijke Philips, N.V.

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Acknowledgments

This research was supported by the Ministry of Education, Science and Technological Development, Republic of Serbia, and Impol-Seval Aluminum Mill, Sevojno, under Contract Grant No. TR 34018.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, POB 35-03, 11 120, Belgrade, Serbia

    Akram Halap (Ph.D. Student), Tamara Radetić (Scientific Advisor), Miljana Popović (Associate Professor) & Endre Romhanji (Professor)

Authors
  1. Akram Halap
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  2. Tamara Radetić
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  3. Miljana Popović
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  4. Endre Romhanji
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Correspondence to Endre Romhanji.

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Manuscript submitted September 13, 2013.

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Halap, A., Radetić, T., Popović, M. et al. Influence of the Thermomechanical Treatment on the Intergranular Corrosion Susceptibility of Zn-Modified Al-5.1 Wt Pct Mg-0.7 Wt Pct Mn Alloy Sheet. Metall Mater Trans A 45, 4572–4579 (2014). https://doi.org/10.1007/s11661-014-2386-y

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