Imidazoline quaternary ammonium salt corrosion inhibitor modified montmorillonite/waterborne epoxy nanocoating
Oleic acid imidazoline quaternary ammonium salt corrosion inhibitor,synthesized from oleic acid,diethylenetriamine and benzyl chloride,was characterized by FTIR and 1HNMR and filled between Na-montmorillonite(DK0)layers through ions exchange to obtain corrosion inhibitor modified montmorillonite(QACDK0).The structure,composition and release properties of QACDK0 were then characterized and analyzed by XRD,TGA and UV-Vis.The results showed that the imidazoline quaternary ammonium salt corrosion inhibitor accounted for 38.96％of QACDK0(mass),and expanded the montmorillonite layer distance from 1.28 nm(DK0)to 3.98 nm(QACDK0).DLS and Zeta potential were further assessed to characterize the stability of aqueous epoxy emulsion with QACDK0.The Zeta potential of emulsion was-27.8 mV,showing high stability.Electrochemical impedance spectroscopy(EIS)test demonstrated that after 30 d of immersion in corrosive medium,the varnish film prepared from QACDK0 still maintained a high impedance of 2.29×108Ω·cm2,indicating excellent anticorrosive performance.Moreover,in the test of neutral salt spray resistance,the grey varnish film containing pigment corresponding to QACDK0 exhibited a longer salt spray resistance,demonstrating its good salt spray resistance performance.
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