Improved Anticorrosion Properties of Polyurethane Nanocomposites by Ti₃C₂T_x MXene/Functionalized Carbon Nanotubes for Corrosion Protection Coatings

Abstract

The corrosion protection of MXene-based composite coatings is challenging due to the relatively low dispersion of MXene in organic coatings. In this work, waterborne polyurethane (WPU) composites containing hybrid nanoadditives of Ti3C2T x MXene and functionalized carbon nanotubes (CNTs) were fabricated. The thermal stability, surface hydrophobicity, surface roughness, and mechanical properties of the nanocomposites containing MXene or MXene/CNT hybrid additives were studied. Electrochemical methods, including electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization scans, were utilized to evaluate the anticorrosion properties of the nanocomposite coatings when applied to copper substrates. The polyurethane sample with 0.95 wt % Ti3C2T x MXene and 0.05 wt % CNTs showed the lowest corrosion rate of 2.1 × 10–3 μm year–1. Additionally, the EIS results revealed that the corrosion resistance of WPU/MXene coatings significantly increased by adding 0.05 wt % CNTs. The mechanism of the improved anticorrosion performance of the WPU/MXene/CNT composite coating is illustrated. Moreover, the importance of optimizing the concentration of the CNTs is discussed to obtain better corrosion protection. The polyurethane nanocomposite coatings reported in this work present great potential as corrosion protection coatings for metals and other surfaces.

Corrosion Control by Carbon-Based Nanomaterials: A Review

“…MXene can improve the anticorrosion performance of composite coatings, and to achieve maximum corrosion inhibition, it is crucial to obtain good dispersion of MXene in organic coatings. Recently, functionalized CNTs with diameters of approximately 20–40 nm were employed as additives to hybridize with Ti 3 C 2 T x MXene to obtain WPU composites for inhibiting the corrosion of Cu substrates . Electrochemical test results found that the nanocomposite sample with 0.95 wt % Ti 3 C 2 T x MXene and 0.05 wt % CNTs showed the lowest corrosion rate of 2.1 × 10 –3 μm year –1 .…”

“…(d) Corrosion rates of the bare substrate and the specimens coated with neat WPU or WPU-based nanocomposites extracted from PDP parameters. Reprinted with permission from ref . Copyright 2023 American Chemical Society.…”

Flame Retardant and Anticorrosion Behavior of Multifunctional Epoxy Nanocomposite Coatings Containing Graphitic Carbon Nitride/Silanized HfO2 Nanofillers for the Protection of Steel Surface in Automobile Industry

“…One of the most straightforward and effective methods in a marine environment is the corrosion prevention of steel by polymeric coatings. − For the purpose of preventing corrosion of steel in the marine environment, coatings must have high anticorrosion capabilities and consistent mechanical properties. In comparison to other polymeric coatings like vinyl ester, polyurethane, and phenolic resins, epoxy coating is regarded as the best organic polymer coating for corrosion mitigation due to its excellent stability under acid/base conditions, good adhesion, and superior mechanical performance. − Despite having excellent adhesion to the steel surface, epoxy coatings have a number of disadvantages, such as the ease with which microcracks, pinholes, and cavities form when exposed to corrosive electrolyte, as well as significant restrictions on the production of coatings with high flammability resistance. − Aggressive species including O 2 , H 2 O, and Cl – can easily enter through these microcracks, where they could interact with the metal contact and lead to corrosion. Simple barrier coatings’ performance cannot keep up with the pipeline industry’s ongoing development.…”