Polyvinylidene fluoride/graphene oxide nanocomposite as anti-corrosion coating in natural gas steel pipelines

Internal corrosion causes the mechanical strength of natural gas steel pipelines to be reduced, leading to cracking. Superior properties of polyvinylidene fluoride (PVDF) makes its as an excellent candidate for the anti-corrosion coating in natural gas steel pipelines. Nevertheless, further development of PVDF nanocomposite is necessary to enhance the properties of neat PVDF in terms ofwettability, mechanical strength, anti-corrosion and impermeable property. In this research, monolayer 3aminopropyltriethoxysilane- graphene oxide (APTES-GO) with a thickness of 0.58 nm was successfully synthesized through surface functionalization of graphene oxide (GO). APTES-GO was selected as the nanofiller to be incorporated into the PVDF matrix. This is because PVDF/APTES-GO nanocomposite displayed better anticorrosion performance than GO. PVDF nanocomposites filled with various loadings of APTES-GO (0.1 to 0.5 wt%) were prepared using N,N-dimethylformamide as the solvent. The detailed anti-corrosion performance of PVDFIAPTES-GO nanocomposites coated onto carbon steel plate was evaluated using Machu, salt spray and acid immersion tests. X-ray diffraction and Fourier transform infrared spectroscopy confirmed thatthe increment ofAPTES-GO from 0.1 to 0.5 wt% loading had transformed ~- and y- to a-phase crystal. Field emission scanning electron microscopy revealed that the PVDF nanocomposite films with a thickness of 73.0 ± 3.61 urn exhibited features of the symmetric membranes. Atomic force microscopy analysis also showed that the surface roughness of PVDF nanocomposite films increased with the increase of APTES-GO loading. Besides that, PVDF nanocomposite filled with 0.4 wt% APTES-GO showed the highest water contact angle of 102° and ~306% increase in tensile modulus as compared to the neat PVDF. This nanocomposite layer (66.67 ± 4.0 urn) was found to exhibit good adhesion property with the lowest corrosion rate of 6.65 mm/yr and highest corrosion protection efficiency of 51.16% in corrosive environments

Morphological study of synthesized RGO/ Pt nanocomposites via facile chemical reduction method

Reduced graphene oxide nanosheet (RGO)/Pt nanocomposite have been successfully prepared through a facile chemical reduction method. The reduction of Pt precursor was carried out using sodium borohydride as the efficient chemical reductant. The morphology of RGO/Pt nanocomposite was investigated using high resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM). HRTEM analysis showed that platinum nanoparticles were homogenously distributed onto the surface of RGO. The electrochemical study proved that Pt nanoparticles were successfully incorporated onto RGO. Therefore, it can be concluded that the proposed method could provide well-dispersed of Pt nanoparticles onto RGO to form RGO/ Pt nanocomposite

Morphological study of synthesized RGO/Pt nanocomposites via Facile Chemical Reduction Method

Reduced graphene oxide nanosheet (RGO)/Pt nanocomposite have been successfully prepared through a facile chemical reduction method. The reduction of Pt precursor was carried out using sodium borohydride as the efficient chemical reductant. The morphology of RGO/Pt nanocomposite was investigated using high resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM). HRTEM analysis showed that platinum nanoparticles were homogenously distributed onto the surface of RGO. The electrochemical study proved that Pt nanoparticles were successfully incorporated onto RGO. Therefore, it can be concluded that the proposed method could provide well-dispersed of Pt nanoparticles onto RGO to form RGO/Pt nanocomposite