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Anodic Behavior Comparison of AA8006 and AlPb20 Alloys After Annealing at Various Temperatures

Investigating the anodic behavior of AA8006 alloy compared to AlPb20 alloy after different annealing temperatures. Activation by annealing at 350°C, role of grain size not studied. Initial results from TEM show elongated particles in surface region.

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Anodic Behavior Comparison of AA8006 and AlPb20 Alloys After Annealing at Various Temperatures

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  1. Background for AA8006 • AA8006-O surfaces, as-received or etched, activate by annealing at lower temperatures (350 C) than model binary AlPb alloys • Activation is actually reduced by increasing the annealing temperature (Yann) • Role of grain size on activation not investigated

  2. Anodic behavior of alloy 8006 as function of annealing temperature Potential, VSCE Current Density, mA/cm2

  3. Potential, VSCE Current Density, mA/cm2 Anodic polarization behaviour of etched AA8006 (10s etched in 5% NaOH solution and 60s desmutted in HNO3), then annealed at different temperatures, as compared with that of the annealed AlPb20 model alloy.

  4. Initial results from TEM characterizations The elongated primary particles, parallel the rolling direction below the surface region

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