Abstract
The effect of long‐term heat treatments in air at 135 °C for up to 42 days on the microstructure and the corrosion properties of the AA6056 aluminum alloy was investigated. The material was studied in the solution annealed (T4) and peak‐aged (T6) condition as well as after long‐term heat impact at 135 °C of up to 42 days (∼1008 h) of the initial T4 and T6 states. The increase of hardness during artificial aging was attributed to β” formation, whereas β’ and/or Q’ phases were found to be formed during over‐aging. The T4‐treated material suffer pitting corrosion, whereas the T6‐treated material was susceptible to intergranular corrosion (IGC) when tested according to ISO 11846 B. The initially T4‐treated material exhibited a complete change from pitting to IGC after 24 h at 135 °C, whereas further aging did not cause any change of the corrosion morphology. The corrosion properties of the T6‐treated material remained unaffected during heat impact up to 42 days.
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