Preparation and corrosion resistance study of two‐dimensional mica‐based composite coatings modified with UIO‐66 and polyethyleneimine

Abstract

Numerous challenges arise from metal corrosion, including economic loss, environmental pollution, and safety issues. Epoxy coatings, as a solution to metal corrosion problems, have been widely used worldwide. The improvement of epoxy coating performance is also a major focus of research. In this paper, we employed a hydrothermal method to load UIO‐66 crystals onto a two‐dimensional mica substrate, while simultaneously modifying the surface with polyethyleneimine (PEI) to enhance the compatibility of the filler in the epoxy coating. The water absorption and adhesion of the PMC‐UIO(4:1)/EP coating were optimized after the addition of the modified filler, with the adhesion strength of the PMC‐UIO(4:1)/EP coating improved to 8.28 MPa. In terms of electrochemical impedance spectroscopy, the PMC‐UIO(4:1)/EP coating manifested long‐lasting and superior corrosion resistance. Specifically, the electrochemical impedance modulus of this coating reached as high as 1011. Remarkably, even after immersion in a 3.5 wt% sodium chloride solution for 30 days, the coating maintained an impedance value order of magnitude at 109, which is unparalleled among all the composite coatings studied, demonstrating its exceptional corrosion resistance.

Superhydrophobic Waterborne Epoxy Composite Coating with Good Mechanical Properties, Icing Resistance, Self-Cleaning Properties, and Corrosion Resistance

“…This indicates that superhydrophobic treatment did not alter the internal crystal structure of ZnO, preserving its fundamental form. 30,31 Additionally, upon comparison, it can be observed that SHZnO exhibits some small scattering peaks around 2θ = 22.5°. 12 This may be attributed to the formation of silica dioxide resulting from the hydrolysis of KH-550.…”

“…Due to its excellent properties such as high adhesion, stability, and low volume shrinkage, epoxy resin is becoming a widely used resin worldwide . Especially in metal corrosion prevention, epoxy resin with high adhesion has become an important choice for coating corrosion protection .…”

“…Due to its excellent properties such as high adhesion, stability, and low volume shrinkage, epoxy resin is becoming a widely used resin worldwide. 30 Especially in metal corrosion prevention, epoxy resin with high adhesion has become an important choice for coating corrosion protection. 31 However, oil-based epoxy resin with higher corrosion resistance often employs environmentally harmful organic solvents such as xylene, while the corrosion resistance of waterborne epoxy resin, which is relatively environmentally friendly, is not as good as that of oil-based epoxy resin.…”