Synergistic effect of functional carbon nanotubes and graphene oxide on the anti-corrosion performance of epoxy coating

Abstract

In this work, we reported the synergistic effect of functional carbon nanotubes (CNTs) and graphene oxide (GO) on the anticorrosion performance of epoxy coating. For this purpose, the GO and CNTs were firstly modified by the 3aminophenoxyphthalonitrile to realize the nitrile functionalized graphene oxides (GO-CN) and carbon nanotubes (CNTs-CN). As modified GO-CN and CNTs-CN were characterized and confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and gravimetric analyzer. It was found that about 19 and 24 wt% of 3-aminophenoxyphthalonitrile were grafted onto the surface of the GO and CNTs, respectively. The electrochemical impedance spectroscopy results showed that the GO-CN&CNTs-CN hybrid materials exhibit a remarkable superiority in enhancing the anticorrosion performance of epoxy coatings. Significant synergistic effect of the lamellar structural GO-CN and CNTs-CN on the anticorrosion performance of epoxy composite coatings was designed. Besides, the epoxy coating with 1 wt% of the GO-CN&CNTs-CN hybrid exhibited the best anticorrosion performance, in which the impedance showed the largest one (immersion in 3.5 wt% of NaCl solution for 168 hr).

Enhanced corrosion protection performance with MWCNT dispersed epoxy coating prepared under supercritical CO2 assistance

“…It provides the values of corrosion current (Icorr) and corrosion potential (Ecorr) for uncoated Al substrate, neat epoxy coating, and MWCNT/epoxy coating, represented by Tafel plots in Figure . It is well known that the low Icorr and more positive values of Ecorr contributes to enhanced corrosion protection performance . Here, the anodic dissolution of uncoated Al metal was verified with higher Icorr and lower Ecorr values in both mediums.…”

“…The uncompromising use of metals with increasing urbanization has caused a great easement in the standard of living, but with a heavy price tag, the metal corrosion. The corrosion associated with the use of metals is considered as a major environmental and economic catastrophe . In order to address this serious problem, scientists have introduced several protective coatings over metal surfaces.…”

“…The corrosion associated with the use of metals is considered as a major environmental and economic catastrophe. 1,2 In order to address this serious problem, scientists have introduced several protective coatings over metal surfaces. In the last few decades, epoxy-based nanocomposites have found a great attention as a high-performance coating for corrosion protection of metallic surfaces.…”

Comparative corrosion protection studies of electroactive/non-electroactive epoxy thermoset composites containing conductive rGO/non-conductive GO platelets

“…Based on literature review, anticorrosion coatings in terms of GO-based epoxy composites were found to attract extensive academic and industrial research interests than other GO-based polymer composites in the past decades. For example, He et al [30] presents that incorporation of GO into epoxy resin significantly enhanced anticorrosion performance on the metallic substrate due to the improved corrosion factor in electrolyte barrier properties derived from highly aspect and dispersed graphene platelets in epoxy coating [31]. Thus, epoxy/graphene composite coatings can be considered as promising candidates for protective coatings in the nuclear industry.…”

Preparation and Anti-Corrosive Properties of Waterborne Epoxy Composite Coating Containing Graphene Oxide Grafted with Sodium Tripolyphosphate

“…However, some micro-holes and cracks will occur during the curing process of waterborne epoxy coating, which lead to reduction of coatings' anti-corrosive properties. One of the effective methods for improving the corrosion resistance of the waterborne epoxy coating is adding nano pigments, such as mesoporous materials [3][4][5][6][7][8], layered materials [9][10][11], metal-organic frameworks [12,13] and so on. In our previous work, ZSM-5 [14], mesoporous-TiO 2 [15,16], layered double hydroxides and metal-organic frameworks [17] have been investigated as anti-corrosive pigments.…”