rGO instead of zinc dust in anticorrosion epoxy composites
A small load (e.g., 0.5 wt%) of reduced graphene oxide (rGO) was used to replace a large amount (e.g., 20–30 wt%) of zinc dust (ZD) in solvent-based zinc-rich epoxy composite coatings (ECCs) to maintain similar anticorrosion, as well as to promote the adhesion/wear resistance of the corresponding coatings simultaneously.
During the study, the corrosion protection of zinc-rich ECCs containing 20, 40, and 80 wt% of ZDs (denoted as DZ-20, DZ-40, and DZ-80, respectively) was investigated by performing a series of electrochemical measurements. The corrosion protection of ECCs was found to decrease in the order DZ-80 > DZ-40 > DZ-20. However, wear-resistance and adhesion tests of ECCs had the opposite trend of DZ-80 < DZ-40 < DZ-20.
Similar anticorrosion performance
Subsequently, the small-load calcined GO at the operational temperatures of 300 °C and 1400 °C (denoted as rGO-300 and rGO-1400, respectively) was further incorporated into ECCs to partially replace large amounts of ZD and maintain similar anticorrosion performance and enhance the wear resistance and adhesion of the corresponding ECCs. This finding indicated that incorporating a small load of 0.5 wt% of rGO-300 and rGO-1400 can partially replace 20 wt% and 30 wt% of ZD load, respectively, in ECCs.
The study has been published in Progress in Organic Coatings, Volume 175, February 2023.
