Alumina nanoparticles-reinforced graphene-containing waterborne polyurethane coating for enhancing corrosion and wear resistance

In this paper,aluminum oxide （Al2O3） nanoparticles-reinforced graphene （G）-containing waterborne polyurethane （WPU） coatings were prepared on the EH40 steel substrate.Wear and corrosion resistance of the Al2O3/G/WPU coatings with different Al2O3 contents were investigated by wear test,electrochemical impedance spectroscopy,and salt spray test.Results showed that the Al2O3/G/WPU coatings exhibited highly enhanced wear and corrosion resistance in comparison with the G/WPU coatings.The Al2O3/G/WPU coating with 3 wt.%Al2O3 was found to exhibit the best performance in terms of friction coefficient,wear volume,corrosion current,and impedance.The Al2O3/G/WPU coatings with promising wear and corrosion resistance may find widespread potential applications in polar icebreaking ship steels.