Ionic modification of graphene nanosheets to improve anti-corrosive properties of organosilicon composite coatings

Composite coatings with anti-corrosive properties were fabricated using quaternized silicone oil modified graphene oxide and silicone polymer. Quaternized silicone oil was successfully synthesized through copolymerization of octamethyl cyclotetrasiloxane (D4), chloropropylsilane and triethylamine. The quaternized silicone oil modified graphene oxide (M-GO) was characterized by using H-1 NMR, FT-IR, Small-angle X-ray scattering (SAXS), Thermogravimetry (TG) and Transmission electron microscopy (TEM). The results showed that the M-GO was formed successfully. The M-GO could be dispersed without aggregation in some organic solvents, and the concentration of M-GO could be up to 3 mg ml(-1). The M-GO-reinforced silicone composites exhibited obvious improvements in thermal stability, mechanical properties and especially anticorrosive properties with the highest E-corr (-121 mV) and the lowest I-corr (6.058 x 10(-9) A cm(-2)), and the protection efficiency of the matrix could reach 99.97%. The anticorrosive mechanism of the fabricated composite coatings was investigated. This work provides a ready strategy for modification of GO and fabrication of high performance graphene-based silicone composite materials.

Automated summary

Composite coatings with anti-corrosive properties were fabricated by using quaternized silicone oil modified graphene oxide and silicone polymer. The quaternized silicone oil modified graphene oxide (M-GO) was successfully synthesized and characterized. The M-GO-reinforced silicone composites exhibited significant improvements in thermal stability, mechanical properties, and especially anti-corrosive properties.