Effects of p-Phenylenediamine Modified Fluorophenediamine on the Properties of Epoxy Resin Coatings on the Aluminum Alloy Surfaces
To improve the dispersion of fluorophenediamine(FG)in the epoxy resin(EP),the density and corrosion resistance of the coatings,p-phenylenediamine(PPDA)was used to functionalize FG,obtaining p-phenylenediamine modified fluorophenediamine(FG-PPDA).FG-PPDA was characterized by infrared spectroscopy(FTIR),X-ray diffractometer(XRD)and scanning electron microscope(SEM).Then the composite coatings were prepared by doping FG or FG-PPDA into EP.The corrosion resistance,mechanical properties and wear resistance of the composite coatings were analyzed by electrochemical test,neutral salt spray test,tensile test,friction and wear test.The results show that the corrosion resistance of EP coatings could be improved by doping FG into EP.After the PPDA functionalization treatment,the dispersion of FG in EP is improved,and the densification of FG-PPDA/EP coating is improved,enhancing the long-term corrosion resistance of the coating.At the same time,the tensile strength of FG-PPDA/EP coating is 47.7 MPa,and the wear rate is 4×10-5 mm3/(m·N).Compared with the EP coating,the mechanical properties and wear resistance of the composite coatings are significantly improved.
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