Novel multifunctional epoxy based graphitic carbon nitride/silanized TiO2 nanocomposite as protective coatings for steel surface against corrosion and flame in the shipping industry
The chemical compound 3-(N-ethylamino)isobutyl)trimethoxysilane(EAMS)modified titanium dioxide(TiO2),producing EAMS-TiO2,which was encased in graphitic carbon nitride(GCN)and integrated into epoxy resin(EP).The protective properties of mild steel coated with this nanocomposite in a marine environment were assessed using electrochemical techniques.Thermogravimetric analysis(TGA)and Cone calorimetry tests demonstrated that GCN/EAMS-TiO2 significantly enhanced the flame retardancy of the epoxy coating,reducing peak heat release rate(PHRR)and total heat release(THR)values by 88％and 70％,respectively,compared to pure EP.Salt spray tests indicated reduced water absorption and improved corrosion resistance.The optimal concentration of 0.6 wt％GCN-EAMS/TiO2 yielded the highest resistance,with the nanocomposite achieving a coating resistance of 7.50×10 10 Ω·cm2 after 28 d in seawater.The surface resistance of EP-GCN/EAMS-TiO2 was over 99.9 times higher than pure EP after one hour in seawater.SECM analysis showed the lowest ferrous ion dissipation(1.0 nA)for EP-GCN/EAMS-TiO2 coated steel.FE-SEM and EDX analyses revealed improved breakdown products and a durable inert nanolayered covering.The nanocomposite exhibited excellent water resistance(water contact angle of 167°)and strong mechanical properties,with adhesive strength increasing to 18.3 MPa after 28 d in seawater.EP-GCN/EAMS-TiO2 shows potential as a coating material for the shipping industry.
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