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.
Hydrogen sulfide corrosion inhibition of carbon steel has been evaluated using the combination of benzene-1,2-diamine, benzaldehyde, and FeCl 3 to in situ inhibitor synthesis at 25°C using electrochemical and weight-loss studies. The results showed that the corrosion rate of steel decreased significantly by increasing the inhibitor concentration. The concentration of in situ synthesized inhibitor was measured by ultraviolet and visible spectrophotometer (UV-vis). The morphology and composition of the corrosion products were analyzed using scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS). Fourier transform infrared spectroscopy (FTIR) demonstrated the formation of 2-phenylbenzimidazole on the surface by an in situ manner. Quantum chemical studies were applied to investigate the correlation between the molecular structure and inhibition effect of this compound.
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