Corrosion behavior of aluminum alloys 2024 and 6061 in rainwater

Abstract

In the present work the corrosion behavior of both aircraft aluminum alloy 2024 and 6061 were studied by cyclic polarization test in Rainwater, before and after heat treatment at room temperature (25 °C). The corrosion resistance of both alloys decreases after these alloys were solution treatment at a temperature of 495 °C for 2hr for AA2024 alloy and artificial aging at temperature (150, 200, 250, and 300 °C) for 1 and 2 hours this decreasing was from 1.767× 10−3 to 1.031× 10−3 mm/y, and for solution treatment at a temperature of 530 °C for 2hr for AA6061 alloy and artificial aging at temperature (150, 200, 250 and 300 °C) for 1 and 2 hours this decreasing 6.279× 10−3 to 1.204× 10−3 mm/y.