Cationic Reduced Graphene Oxide as Self-Aligned Nanofiller in the Epoxy Nanocomposite Coating with Excellent Anticorrosive Performance and Its High Antibacterial Activity

Abstract

The design and preparation of an excellent corrosion protection coating is still a grand challenge and is essential for large-scale practical application. Herein, a novel cationic reduced graphene oxide (denoted as RGO-ID)-based epoxy coating was fabricated for corrosion protection. RGO-ID was synthesized by in situ synthesis and salification reaction, which is stable dispersion in water and epoxy latex, and the self-aligned RGO-ID-reinforced cathodic electrophoretic epoxy nanocomposite coating (denoted as RGO-ID coating) at the surface of metal was prepared by electrodeposition. The self-alignment of RGO-ID in the coatings is mainly attributed to the electric field force. The significantly enhanced anticorrosion performance of RGO-ID coating is proved by a series of electrochemical measurements in different concentrated NaCl solutions and salt spray tests. This superior anticorrosion property benefits from the self-aligned RGO-ID nanosheets and the quaternary-N groups present in the RGO-ID nanocomposite coating. Interestingly, the RGO-ID also exhibits a high antibacterial activity toward Escherichia coli with 83.4 ± 1.3% antibacterial efficiency, which is attributed to the synergetic effects of RGO-ID and the electrostatic attraction and hydrogen bonding between RGO-ID and E. coli. This work offers new opportunities for the successful development of effective corrosion protection and self-antibacterial coatings.

A Self-Strengthening Epidermis-Like Smart Coating Enabled by Dynamic Iron Sequestration

“…In addition, the impedance modulus (|Z|0.01Hz), which reflects the ability of a coating to restrain the current between the cathodic and anodic areas, increases significantly (Figure 5d). These results confirm that the bilayer can respond to the increase of salinity to improve its anticorrosion properties, different from other polymeric anticorrosion materials, [66][67][68] which generally degrade along with more service time. Similar results are observed with the bottom layer alone, but the bilayer design results in much enhanced anticorrosion properties (Supporting Information Figure S9 and Table S6,S7) because MTM nanosheets as a physical barrier for corrosive species can reduce their diffusion in the coating.…”

Improvement of Corrosion Resistance of Waterborne Polyurethane Coatings by Covalent and Noncovalent Grafted Graphene Oxide Nanosheets

“…The band peak at 1540 cm –1 can be assigned to carbamate esters and the coupling of the C–N stretching vibration with the CHN deformation vibration (the so-called amide II vibration stretch). 42 The new peak at 2950 cm –1 is attributed to the methyl group (C–H, from N , N -dimethylethanolamine) stretching vibrations. The new adsorption peaks at 1240 and 1050 cm –1 can be assigned to the C–N stretching.…”

Reduced Graphene Oxide–Epoxy Grafted Poly(Styrene-Co-Acrylate) Composites for Corrosion Protection of Mild Steel

“…only 3.141 × 10 −4 µA/cm 2 ) [23]. However, up to now, the G, GO or rGO composites modified with polyacrylate derivatives for anticorrosion properties have rarely been reported, which have potentially wide industrial application.…”