Abstract
The effect of the retrogression and re‐aging (RRA) heat treatment on the corrosion behavior of B206 aluminum‐copper casting alloy in artificial seawater employing electrochemical experiments such as electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization, weight loss measurements and microstructure studies is reported. The electrochemical results show that the corrosion resistance of RRA samples is much higher than that of the as‐cast microstructure for the first 48 h of immersion in artificial seawater. However, the RRA samples corrode more rapidly after 48 h of immersion. Weight loss measurements confirm the electrochemical findings. The dependence of the corrosion rate on immersion time for RRA samples was found to be related to the microstructural features. Exfoliation corrosion was also observed in the cross‐section of RRA samples after 48 h of immersion in artificial seawater.
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