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Effect of Solution Treatment on Mechanical and Corrosion Behaviors of 6082-T6 Al Alloy

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Abstract

The mechanical and corrosion behavior of Al alloy 6082-T6 subjected to solution heat treating condition at temperatures varying from 400 to 600 °C and soaking times of 3–24 h have been investigated. Solution heat treating at 550 °C for 24 h led to the dissolution of the Mg2Si and AlSi6Mg3Fe precipitates into the matrix, and the Al12(FeMn)3Si2 phase transformed into Al85(Fe0.28Mn0.72)14Si phase. The solution-treated alloy showed equiaxed grain morphology with an average grain size of 85.7 µm. Increasing the solution heat treating temperature beyond 550 °C caused a reduction in corrosion resistance of the alloy. The pitting potential increased due to the presence of the anodic phase Mg2Si (dissolved at 550 °C) in Al matrix and it decreased with the formation of cathodic phases such as AlSi6Mg3Fe and Al12(FeMn)3Si2 (dissolved at 550 °C/24 h) in the alloy. General corrosion resistance of the alloy increased with decreasing Mg2Si concentration in the Al matrix. The optimum solution heat treating condition of 550 °C for 24 h resulted in an improvement in hardness (63 VHN), ultimate tensile strength (UTS—208 MPa), and pitting potential (−675 mV) and uniform corrosion potential (−1.255 mV) of 6082 Al alloy.

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Author notes

  1. R. Jayaganthan

    Present address: Department of Engineering Design, Indian Institute of Technology Madras, Chennai, 600036, India

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Nikhil Kumar, Sunkulp Goel & R. Jayaganthan

  2. Institute of Materials Science and Engineering, Clausthal University of Technology, Agricolastrasse 6, 38678, Clausthal-Zellerfeld, Germany

    Heinz-Günter Brokmeier

  3. Helmholtz Zentrum Geesthacht, Max Planck Straße 1, Geb 33, 21502, Geesthacht, Germany

    Heinz-Günter Brokmeier

Authors
  1. Nikhil Kumar
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Correspondence to R. Jayaganthan.

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Kumar, N., Goel, S., Jayaganthan, R. et al. Effect of Solution Treatment on Mechanical and Corrosion Behaviors of 6082-T6 Al Alloy. Metallogr. Microstruct. Anal. 4, 411–422 (2015). https://doi.org/10.1007/s13632-015-0219-z

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  • DOI: https://doi.org/10.1007/s13632-015-0219-z

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