▎ 摘　　要

For waterborne coating, there is still inevitable defects (insufficient anti-corrosion performance). In this paper, the functional graphene oxide (TDPG) is prepared via self-prepared polymer (triethylene tetramine-polyethylene glycol diglycidyl ether). The TDPG is used to modify waterborne polyurethane (WPU) coating for improving anti-corrosion property. The electrochemical impedance spectroscopy and salt spray test are used to evaluate the corrosion resistance ability of composite coating. The WPU/TDPG(0.05) owns optimal corrosion resistance property. After 30 days immersion in 3.5 wt.% NaCl solution, the impedance modulus Z(f) (=) (10 mHz) of WPU decreases to 6.17 x 10(6) Omega.cm(2) from 1.36 x 10(7) Omega.cm(2), but the Z(f) (=) (10 mHz) of WPU/TDPG(0)(.05) decreases to 9.48 x 10(6) Omega.cm(2) from 2.39 x 10(7) Omega.cm(2). By Tafel test, the corrosion potential of WPU/TDPG 0 05 is -0.056 v, which is more positive than that of WPU (-0.224 v). The corrosion current and polarization resistance of WPU/TDPG(0)(.05) are 1.30 x 10(-8) A/cm(2) and 3.4 x 10(6) Omega.cm(2), respectively. Moreover, the adhesion strength of WPU/ TDPG 0 05 decreases to 5.89 MPa from 6.69 MPa, only losing 16.96 %.