Aluminum Guefoams Coated with Reduced Graphene Oxide: A Corrosion Protection Study

To enhance their corrosion protection, Guefoams were coated with RGO using both potentiostatic and potentiodynamic methods. The potentiodynamic method produced the thickest RGO coating and the lowest Cl, O, and Al content, as observed using FESEM and EDX. The Guefoams were exposed to a 3.5% NaCl solution and steam. The polarization resistance was examined, electrochemical impedance spectroscopy was performed, and polarization curves were constructed to monitor the corrosion process. After 28 days, the Al concentrations in the solutions were measured, and were found to be 145 mg/L (bare Guefoam), 70 mg/L (RGO-coated, potentiostatic), and 35 mg/L (RGO-coated, potentiodynamic). The potentiodynamic RGO coating also showed the best corrosion protection values. ; This research is part of the Spanish R+D+i contracts PDC2021-121617-C21 and PDC2021-121617-C22, funded by MCIN/AEI/10.13039/501100011033 and by the “European Union NextGenerationEU/PRTR”. Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital (Generalitat Valenciana) is gratefully acknowledged for providing funding (GVA-COVID19/2021/097). Funding for the open access charge was provided by CRUE-Universitat Politècnica de València.