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)
نویسندگان
1 School of Chemical Engineering, College of Engineering, University of Tehran, Kish International Campus, Tehran, Iran
2 School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
3 Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran
4 Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran
5 Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, Tehran, Iran
6 Materials Science and Technology, Civil and Engineering Department, Università di Perugia, Loc. Pentima Bassa 21, 05100 Terni, Italy
doi
10.30509/pccc.2020.81655چکیده
In this research, graphene oxide (GO) nanoparticles were modified by second and fourth generations of poly(amidoamine) dendrimers in order to improve the particle dispersion quality in the epoxy matrix and therefore its barrier anti-corrosion performance. Confirmation on the GO surface modification by Polyamidoamine generation 2 (PAMAM2) and polyamidoamin generation 4 (PAMAM4) was carried out by Fourier transforms infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The corrosion protection properties of the epoxy composites against corrosive electrolyte (3.5 wt.% NaCl solution) was investigated by salt spray and electrochemical methods. The dispersion of unmodified and modified GO sheets in the epoxy matrix was studied by FE-SEM analysis. The FT-IR test results evidenced that the GO sheets were successfully modified with PAMAM 2 and 4 via the covalent binding mechanism. Salt spray and EIS test results revealed that the epoxy composites loaded with GO-PAMAM4 and PAMAM4 showed the highest improvement in the corrosion resistance. FE-SEM images from the fracture surface of the coatings revealed that the dispersion of GO sheets within the epoxy coating was improved after modification by PAMAM4.
