Abstract
The effect of heat treatment in the underaged, peak aged and overaged conditions in the temperature range 140–225 °C on the corrosion characteristics of Al–Mg–Si–Cu alloy (AA6061) was investigated. Potentiodynamic polarization testing in neutral NaCl solution and immersion testing in acidified NaCl solution were applied to investigate the corrosion behavior of the alloy. The results showed significant dependence of the dominant corrosion form and the electrochemical corrosion parameters on the aging conditions. Maximum changes were noted for the peak aged condition. The results were discussed in terms of changes in precipitate type, size, volume fraction and distribution.
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