studying the corrosion protection behavior of an epoxy composite coating reinforced with functionalized graphene oxide by second and fourth generations of poly(amidoamine) dendrimers (go-pamam-2, 4)

In this research, graphene oxide (go) nanoparticles were modified bysecond and fourth generations of poly(amidoamine) dendrimers in orderto improve the particle dispersion quality in the epoxy matrix andtherefore its barrier anti-corrosion performance. confirmation on the gosurface modification by polyamidoamine generation 2 (pamam2) andpolyamidoamin generation 4 (pamam4) was carried out by fourier transformsinfrared (ft-ir) spectroscopy and thermogravimetric analysis (tga). thecorrosion protection properties of the epoxy composites against corrosiveelectrolyte (3.5 wt.% nacl solution) was investigated by salt spray andelectrochemical methods. the dispersion of unmodified and modified go sheetsin the epoxy matrix was studied by fe-sem analysis. the ft-ir test resultsevidenced that the go sheets were successfully modified with pamam 2 and 4via the covalent binding mechanism. salt spray and eis test results revealedthat the epoxy composites loaded with go-pamam4 and pamam4 showed thehighest improvement in the corrosion resistance. fe-sem images from thefracture surface of the coatings revealed that the dispersion of go sheets withinthe epoxy coating was improved after modification by pamam4.