Graphene Oxide Surface Modification With Green/Biocompatible Corrosion Inhibitors and Application As Efficient Active/Barrier Nano-Filler

Due to environmental concerns, many studies have been conducted on the green corrosion inhibitors in recent years. in an effort to create an active inhibitive system, graphene oxide (go) was used as a nanocarrier for green inhibitors. in our research, go was first reduced by tannic acid (go-t) and then modified by zinc cations (go-tz). finally, the l-histidine molecules were adsorbed on the go-tz (go-tzl). the inhibition performance/mechanism of the synthesized nanosheets in the 3.5% nacl solution was studied by the polarization method. then, fe-sem/eds were employed to characterize the surface morphology and composition of the immersed steel samples. the results of the polarization test demonstrated that the presence of nanosheets reduced the corrosion current density. the maximum reduction was related to the sample exposed to the go-tzl solution. considering the potential displacement and tafel slope reduction, the go-tzl acted as a mixed-type inhibitor. fe-sem images taken from the surface of the samples indicated that the presence of the modified go nanosheets prevented the formation of corrosion products. compared to the go-t and go-tz samples, larger complexes were formed at the surface of the go-tzl sample.

Graphene oxide surface modification with green/biocompatible corrosion inhibitors and application as efficient active/barrier nano-filler

Due to environmental concerns, many studies have been conducted on the green corrosion inhibitors in recent years. In an effort to create an active inhibitive system, graphene oxide (GO) was used as a nanocarrier for green inhibitors. In our research, GO was first reduced by tannic acid (GO-T) and then modified by zinc cations (GO-TZ). Finally, the L-histidine molecules were adsorbed on the GO-TZ (GO-TZL). The inhibition performance/mechanism of the synthesized nanosheets in the 3.5% NaCl solution was studied by the polarization method. Then, FE-SEM/EDS were employed to characterize the surface morphology and composition of the immersed steel samples. The results of the polarization test demonstrated that the presence of nanosheets reduced the corrosion current density. The maximum reduction was related to the sample exposed to the GO-TZL solution. Considering the potential displacement and Tafel slope reduction, the GO-TZL acted as a mixed-type inhibitor. FE-SEM images taken from the surface of the samples indicated that the presence of the modified GO nanosheets prevented the formation of corrosion products. Compared to the GO-T and GO-TZ samples, larger complexes were formed at the surface of the GO-TZL sample.