Randomized trial investigates corrosion susceptibility in aluminium alloys following varying cooling rates, suggesting innovative quality control techniques.
Intergranular corrosion (IGC) of heat‐treatable aluminium (Al) alloys is generally attributed to the nature, frequency and distribution of intermetallic phases (IMPs). The time‐dependent hardening process is given specific focus. During this process, IMPs form within the supersaturated Al solid solution after solution annealing, cooling and aging. To date, only a few studies have investigated how cooling rate affects IGC susceptibility in 2xxx series alloys. Therefore, the EN AW‐2024 alloy was treated with various cooling rates after solution annealing, and its susceptibility to IGC and hardness were investigated using different methods. IGC depths from corrosion testing acc. to ISO 11846, as determined by light microscopy of cross‐sections, correlated very well with cooling rates and were consistent with both non‐destructive eddy current testing and changes in electrical conductivity. For practical corrosion testing as part of quality control, the non‐destructive eddy current method can provide valuable insights into the depth and extent of IGC of such a 2xxx series alloy. Whether this method can also be used for other aluminium alloy systems has to be investigated.
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Schulz et al. (2026) studied this question.
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