Enhanced electrical conductivity of anticorrosive coatings by functionalized carbon nanotubes: effect of hydrogen bonding

Abstract

Carbon nanotubes (CNTs) and nanofibers (CNFs) are well-known nano additives that produce coating materials with high electrical and thermal conductivity and corrosion resistance. In this paper, coating materials incorporating hydrogen bonding offered significantly lower electrical resistance. The hydrogen bonding formed between functionalized carbon nanotubes and ethanol helped create a well-dispersed carbon nanotube network as the electron pathways. Electrical resistivity as low as 6.8 Ω⋅cm has been achieved by adding 4.5 wt.% functionalized multiwalled carbon nanotubes (MWNT-OH) to 75%Polyurethane/25%Ethanol. Moreover, the thermal conductivity of Polyurethane was improved by 332% with 10 wt.% addition of CNF. Electrochemical methods were used to evaluate the anti-corrosion properties of the fabricated coating materials. Polyurethane with the addition of 3 wt.% of MWNT-OH showed an excellent corrosion rate of 5.105×10-3 mm/year, with a protection efficiency of 99.5% against corrosive environments. The adhesion properties of the coating materials were measured following ASTM standard test methods. Polyurethane with 3 wt.% of MWNT-OH belonged to class 5 (ASTM D3359), indicating the outstanding adhesion of the coating to the substrate. These nano coatings with enhanced electrical, thermal, and anti-corrosion properties consist of a choice of traditional coating materials, such as Polyurethane, yielding coating durability with the ability to tailor the electrical and thermal properties to fit the desired application.

Improved Anticorrosion Properties of Polyurethane Nanocomposites by Ti3C2Tx MXene/Functionalized Carbon Nanotubes for Corrosion Protection Coatings

“…In this work, Ti 3 C 2 T x MXene and hydroxyl-functionalized multiwalled carbon nanotubes were dispersed in waterborne polyurethane. The surface terminations of MXene and the hydroxyl groups on CNTs enabled the formation of hydrogen bonding interactions, which significantly improved the dispersion of both nanofillers . The nanocomposites were coated on copper substrates for anticorrosion studies through electrochemical methods.…”

“…The surface terminations of MXene and the hydroxyl groups on CNTs enabled the formation of hydrogen bonding interactions, which significantly improved the dispersion of both nanofillers. 39 The nanocomposites were coated on copper substrates for anticorrosion studies through electrochemical methods. Additionally, the hydrophobicity, surface roughness, and mechanical properties of the nanocomposite samples were evaluated.…”