Experimental and Theoretical Studies toward Superior Anti-corrosive Nanocomposite Coatings of Aminosilane Wrapped Layer-by-Layer Graphene Oxide@MXene/Waterborne Epoxy

Abstract

Herein, layer-by-layer MXene/graphene oxide nanosheets wrapped with 3-aminopropyltriethoxy silane (abbreviated as F-GO@MXene) are proposed as an anti-corrosion promoter for waterborne epoxies. The GO@MXene nanohybrid is synthesized by a solvothermal reaction to produce a multi-layered 2D structure without defects. Then, the GO@MXene is modified by silane wrapping under a reflux reaction, in order to achieve chemical stability and to create active sites on the nanohybrid surface for reaction with the polymer matrix of the coating. The organic coating modified with 0.1 wt % F-GO@MXene has revealed superior corrosion protection efficiency than the organic coatings modified with either F-GO or F-MXene nanosheets. The impedance modulus at low frequency for the pure epoxy, epoxy/F-MXene, epoxy/F-GO, and epoxy/F-GO@MXene coatings is 4.17 × 105, 5.5 × 108, 4.46 × 108, and 1.14 × 1010 Ω·cm2 after 30 days of immersion in the corrosive media, respectively. The remarkable anti-corrosion property is assigned to the intense effect of the nanohybrid on the barrier performance, surface roughness, and adhesion strength of the epoxy coating. The complemental analysis based on first-principles density functional theory reveals that the adhesion strength related to the silane functional groups in its complexes follows the order F-GO@MXene > F-MXene > F-GO. The enhanced stabilization predicted on the GO@MXene nanohybrid ultimately stems from the combined role of the electrostatic and van der Waals forces, suggesting an increase in the penetration path of the corrosive media.

Development of eco-friendly biofilms by utilizing microcrystalline cellulose extract from banana pseudo-stem

“…Fourier transform infrared spectroscopy (FTIR) analysis was conducted to analyse the chemical structural interactions within the composite films composed of Microcrystalline Cellulose (MCC) reinforcing the control films made with Polyvinyl Alcohol (PVA) and Carboxymethyl Cellulose (CMC) [ [46] , [47] , [48] ]. The broad spectrum observed at 3280 cm −1 signifies terminal (vinyl) C–H stretch and hydroxy group H-bonded OH stretch, confirming the presence of PVOH and OH functional groups of micro cellulose.…”

“…In the case of the higher percentage of PVA, the same phenomenon was observed. PVA is hydrophilic in nature but soluble in water [ 46 , 47 ]. PVOH is extremely hydrophilic and dissolves in water, facilitating hydrolysis.…”

Effects of Nanoadditives on the Anticorrosion Performance of Nanocomposite Coatings: A Review

“…170 The combination of the most classic 2D material (GO) and the popular 2D material (MXene) brings the anticorrosion performance of the coating to a higher level. 171 Zhou et al 172 synthesized GO@MXene nanohybrid through a solvothermal reaction to produce a defect-free multilayered 2D structure (Figure 13d 1 ). Then GO@MXene was modified with APTES under a reflux reaction to obtain the F-GO@MXene composite material.…”

“…Copyright 2019 Elsevier. (d 1 , d 2 , d 3 , and d 4 ) F-GO@MXene . Adapted with permission from ref .…”

“…(d 1 , d 2 , d 3 , and d 4 ) F-GO@MXene . Adapted with permission from ref . Copyright 2022 American Chemical Society.…”