Abstract
This work contributes to the development and characterization of the corrosion resistance and antifriction properties of high performance polyurethane (PU)/graphene (Gr) composite coating. In this study, PU composite coatings containing 0, 2, 4 and 8 wt.% of Gr were prepared and evaluated using various corrosion and mechanical tests, namely electrochemical impedance spectroscopy, salt spray tests, cross-cut tape tests and dynamic mechanical analysis. Antifriction properties of the coatings were evaluated using a tribometer with a ball-on-disc mode at room temperature. The corrosion resistance and adhesion property of the PU coatings were found to be enhanced by adding 4 and 8 wt.% of Gr. The coefficient of friction revealed that the antifriction properties of the PU/Gr composite coatings were 61% lower than those of the conventional coating when the Gr content was increased to 8 wt.%.
Highlights
Metallic substrates are susceptible to corrosion attacks in natural environments
Dhoke and co-workers [1] found that the addition of nano-ZnO on the alkyd-based waterborne coating can enhance the density of the coatings thereby reducing the transport paths for the corrosive electrolyte to pass through the coating system and reducing the corrosion process
Mo et al [38] investigated the tribological performance of PU composite coatings reinforced with functionalized Gr (FG) and Gr oxide (FGO) and found that FG and FGO enhanced the antifriction property of PU composite coatings owing to their lubricating effects
Summary
Metallic substrates are susceptible to corrosion attacks in natural environments. many corrosion protection treatments, such as electroplating, anodization, hot-dip galvanization, conversion coatings, corrosion inhibitors, barrier coatings and cathodic protection have been used to protect metallic substrates for many years. Mo et al [38] investigated the tribological performance of PU composite coatings reinforced with functionalized Gr (FG) and Gr oxide (FGO) and found that FG and FGO enhanced the antifriction property of PU composite coatings owing to their lubricating effects. They pointed out that the optimized additive range was from 0.25 to 0.5 wt.%. The antifriction properties of the coatings are discussed based on their COF values and the mechanical properties
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