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Time Dependent Ambient Oxidation of AA6061-T6 Alloy at the Temperature of 580°C

Abstract

The AA6061-T6 alloy is used in many industrial applications such as hydraulic pistons, aerospace and marine vehicle fittings, including the nuclear reactors due to their excellent joining and coating properties, high strength, good formability, high resistance to aquatic corrosion and neutron transparency. This study consists of high temperature oxidation for which the samples were oxidized using thermogravimetric analysis, at a temperature of 580°C in an atmosphere that contains air and argon. Exposure of exposure times at 580°C varied from 15 min to 8 h, which permitted to understand the mechanism of oxide formation mechanisms in this alloy and progressive formation of oxide layers on the surface. The chemistry, thickness and the morphology of the oxide layer formed on the surface was characterized by scanning electron microscopy (SEM-EDS), X-ray diffraction which revealed the existence of the following elements in the oxide layer, such as Al2O3, Al9Si, SiO2, MgO and Mg3O4. Results showed that the oxide layer becomes thicker with the increasing exposure time and is accompanied by a loss of weight compared to the mass formed at the beginning of the thermogravimetric analysis.

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Correspondence to Samir Attafi.

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Samir Attafi, Aklouche-benouaguef, S. & TALAŞ, Ş. Time Dependent Ambient Oxidation of AA6061-T6 Alloy at the Temperature of 580°C. Prot Met Phys Chem Surf 57, 786–795 (2021). https://doi.org/10.1134/S2070205121040067

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Keywords:

  • high-temperature oxidation
  • AA6061-T6 aluminium alloy
  • oxygen diffusion
  • thickness
  • oxide layer
  • interface
  • degradation