Application of Moo42− Modified Go For Enhanced Corrosion Resistance of Epoxy Coating

Sodium molybdate (na2moo4) was loaded on the graphene oxide (go) sheets decorated by polypyrrole (ppy) with the aim of construction of a multi-functional nano-carrier with dual barrier-active anticorrosion functions for inclusion into the epoxy coating. the in-situ polymerization of pyrrole monomers on the go surface and then adsorption of na2moo4 caused go-ppy+na2moo4 nanoparticles construction. the ftir analysis and fe-sem images showed that go was modified with ppy and also that na2moo4 was adsorbed on the go sheets. the electrochemical impedance spectroscopy (eis) measurements were employed to evaluate the corrosion inhibition power of go+ppy+na2moo4 system in the composite coatings (intact and defected epoxy films). the protection properties of these coatings with and without inhibitor were studied in 3.5 wt.% nacl solutions at constant ph=7. the results showed that functionalizing of go sheets increases the sheet dispersion in the polymer matrix while also making the flakes' surface hydrophobic. ppy may also absorb the electrons generated by metal dissolution and decrease from an oxidized to a reduced state, resulting in the production of passive layers at the coating/metal interface. the inclusion of well-distributed go-ppy+na2moo4 nanoparticles in the polymer matrix lengthens the diffusion channel by occupying the coating pore and improves its corrosion resistance. the findings revealed that the presence of nano-carriers in defective samples provides good corrosion protection at the scratch site, with released molybdate ions and creating an insoluble layer in the zone.

Application of MoO42− modified GO for enhanced corrosion resistance of epoxy coating

Sodium molybdate (Na2MoO4) was loaded on the graphene oxide (GO) sheets decorated by polypyrrole (PPy) with the aim of construction of a multi-functional nano-carrier with dual barrier-active anticorrosion functions for inclusion into the epoxy coating. The in-situ polymerization of pyrrole monomers on the GO surface and then adsorption of Na2MoO4 caused GO-PPy+Na2MoO4 nanoparticles construction. The FTIR analysis and FE-SEM images showed that GO was modified with PPy and also that Na2MoO4 was adsorbed on the GO sheets. The electrochemical impedance spectroscopy (EIS) measurements were employed to evaluate the corrosion inhibition power of GO+PPy+Na2MoO4 system in the composite coatings (intact and defected epoxy films). The protection properties of these coatings with and without inhibitor were studied in 3.5 wt.% NaCl solutions at constant pH=7. The results showed that functionalizing of GO sheets increases the sheet dispersion in the polymer matrix while also making the flakes' surface hydrophobic. PPy may also absorb the electrons generated by metal dissolution and decrease from an oxidized to a reduced state, resulting in the production of passive layers at the coating/metal interface. The inclusion of well-distributed GO-PPy+Na2MoO4 nanoparticles in the polymer matrix lengthens the diffusion channel by occupying the coating pore and improves its corrosion resistance. The findings revealed that the presence of nano-carriers in defective samples provides good corrosion protection at the scratch site, with released molybdate ions and creating an insoluble layer in the zone.