Weiqiang Song
Mots-clés : graphene oxide, aluminum dihydric tripolyphosphate, layered hybrid, epoxy coating, anticorrosion
Résumé :
ADTP-GO hybrid was prepared from multi-layered aluminum dihydric tripolyphosphate (ADTP) and flake-shaped graphene oxide (GO) by a coupling method using (3-aminopropyl) triethoxysilane (ASi) as the coupling agent. Characterization analyses of the hybrid were performed by FT-IR, XRD and SEM. The effect of incorporating 2wt% ADTP-GO hybrid on corrosion inhibition performance of epoxy coating was evaluated in 3.5wt.% NaCl aqueous solution by using Tafel and electrochemical impedance spectroscopy (EIS) analysis. For comparison, the effects of ADTP and GO, alone and in combination without coupling treatment were also evaluated. FT-IR and XRD showed the presence of the chemical interaction between ADTP and GO in ADTP-GO hybrid. SEM indicated that GO was spread on the surface of ADTP layers in the hybrid. Tafel and EIS data indicated that the hybrid displayed an anti-corrosion performance superior to ADTP/GO blend without coupling treatment. The superiority was attributed to the stronger synergetic effect of ADTP and GO in ADTP-GO hybrid than in ADTP/GO blend. Additionally, epoxy/ADTP/GO coating was better than pure epoxy, epoxy/ADTP, and epoxy/GO coatings in the anti-corrosion performance on mild steel. It seems that the combination of ADTP and GO produced synergistic effect, and the synergistic effect was more obvious after chemical coupling.
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4000 AlH2P3O10. 2H2O AlPO4 3000 2000 1000 10 20 30 40 2 / degrees ADTP-ASi-GO GO graphite 0 5 10 15 2 20 degrees 25 30 35 ASi ADTP-ASi 1029972 1226 ADTP/GO 1247 1057 976 1029 969 ADTP-ASi-GO 811 811 808 1226 ADTP 1247 GO 986 1057 4000 3000 1500 1000 -2 Wave number / cm 811 500 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO -4 -6 -8 -10 -12 -0.4 -0.2 E/V 0.0 0.2 0.2 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO 0.1 0.0 -0.1 -0.2 -0.3 -0.4 0 50 100 150 200 250 Exposure time / hours -6 -7 -8 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO -9 -10 0 50 100 150 Exposure time / hours 200 250 108 8.0x106 (a) 10 7 10 6 6.0x106 105 4.0x106 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO 104 10 3 102 10 -2 10 -1 10 0 10 1 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO (b) 2.0x106 0.0 10 f / Hz 2 10 3 10 4 5 10 0.0 3.0x106 6.0x106 9.0x106 1.2x107 1.5x107 Zre / ohms 107 1.0x106 (c) 6 10 8.0x105 105 6.0x105 104 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO 103 102 10-2 10-1 100 2.0x105 101 102 103 104 105 0.0 0.0 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO (e) 104 4.0x105 8.0x105 1.2x106 1.6x106 2.0x106 Zre/ohms f / Hz 105 (d) 4.0x105 1 10 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO 1.0x105 8.0x104 6.0x104 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO (f) 4.0x104 103 2.0x104 102 10-2 10-1 100 101 102 103 104 105 0.0 0.0 3.0x104 6.0x104 9.0x104 1.2x105 1.5x105 Zre/ohms f / Hz 105 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO (g) 104 2.0x104 1.6x104 1.2x104 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO (h) 3 10 8.0x103 102 101 4.0x103 10-2 10-1 100 101 102 f / Hz 103 104 105 0.0 0.0 4.0x103 8.0x103 1.2x104 1.6x104 2.0x104 zre/ohms 108 epoxy epoxy/ADTP epoxy/GO epoxy/ADTP/GO epoxy/ADTP-GO 7 10 106 105 4 10 103 0 50 100 150 200 Exposure time / hours 250