▎ 摘　　要

This paper explored that the novel waterborne polyurethane (WPU) composite coatings with superior corrosion protection performance was fabricated via intercalating functionalized graphene oxide (GO). The eco-friendly and superhydrophobic aminoethyl aminopropyl isobutyl polyhedral oligomeric silsesquioxane (POSS-NH-NH2) was applied to modify GO via facile one-step chemical grafting. Several analyses such as FT-IR, XRD, Raman, and SEM were performed to verify the successful graft of POSS-NH-NH2 into the GO. Sequentially, the WPU and WPU composite coatings containing GO and functional graphene oxide (PNNG) nanoparticles were prepared and applied on Q235 steel with a thickness of 55 & PLUSMN; 5 mu m. The corrosion protection performance of coatings was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization. The results highlighted that well-dispersed and hydrophobic PNNG nanoparticle remarkably enhanced the corrosion protection performance of WPU. In detail, the protection efficiency of WPU composite coatings with 0.1 wt% PNNG reached 99.79% relative to pure WPU. After 21 days' immersions in 3.5 wt% NaCl aqueous solution, the |Z|(f = 0.01 Hz) of WPU decreased to 1.96 x 10(5) omega cm(2) from 1.52 x 10(7) omega cm(2). However, the |Z|(f = 0.01) Hz of WPU with 0.1 wt% PNNG was 1.48 x 10(8) omega cm(2) after 180 days' immersions, which was still about 3 orders of magnitude higher than that of WPU.