Abstract
Structural factors influencing the electrochemical corrosion of 2024 aluminum alloy after conventional strengthening heat treatment and its combination with isothermal rolling at liquid-nitrogen temperature were studied using optical metallography, transmission electron microscopy and electrochemical tests. It is established that the cryorolled and naturally aged alloy demonstrated relatively high corrosion resistance, which sharply decreased with artificial aging at 190 °C. Such a loss of corrosion resistance is caused by the accelerated decomposition of the preliminary supersaturated aluminum solid solution, accompanied by the formation of the mixed structure of the matrix, consisting of recovered and recrystallized areas with a bimodal distribution of main strengthening phases. It is concluded that corrosion of the cryorolled and aged alloy has a common nature and is mainly depends on the phase factors.
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