Corrosion performance of waterborne epoxy coatings containing polyethylenimine treated mesoporous-TiO2 nanoparticles on mild steel

Corrosion Resistance of Waterborne Epoxy Coatings by Incorporation of Dopamine Treated Mesoporous-TiO2 Particles

“…Dopamine can react with the epoxy groups as well as interact with hydroxyl groups on the surface and in the inner-channel of meso-TiO2 to form hydrogen bonds ( Figure 1) [15,16]. The dopamine which inlays on the surface and inside of the meso-TiO2 can strengthen possible chemical interactions between epoxy matrix and meso-TiO2 [17], so that the molecular chain of the epoxy resin in the nano-sized pores extending along the channels to the openings, which enhance the miscibility through the entanglement and inter-diffusion between the matrix and the particulate. Meanwhile, it highly suppresses the aggregation of fillers (Figure 2) [18].…”

Effect of Graphene Oxide/ZSM-5 Hybrid on Corrosion Resistance of Waterborne Epoxy Coating

“…The preparation of the anti-corrosion coating was the same as previous reports [19,20]. To optimize the proportion of the composite in the anti-corrosion coatings, we studied a series of composite proportions (0.2 wt %, 0.5 wt %, 0.7 wt %, 1 wt %, 2 wt %).…”

“…EIS played an important role in monitoring and predicting the degradation of organic coatings and in predicting the microscale corrosion resistance of coatings [19]. Figure 6 displayed Nyquist diagrams for six different coatings during a 700 h immersion in 3.5 wt % NaCl solution.…”

“…When the immersion time reached 480 h, the resistance value of the coating decreased further and a second semicircle appeared in the low-frequency region of the EIS spectrum, indicating that the metal substrate began to react with the corrosive electrolyte [27]. At this time, the barrier properties of the coatings decreased substantially, which was attributed to the complete diffusion of the electrolyte inside the coating and to the electrolyte contacting the metal/oxide interface, causing corrosion reactions [19].…”

“…Various reports have shown that the corrosion resistances of coatings can be improved with the addition of nanoparticles such as TiO2 [16], SiO2 [17], and ZnO [18]. In our previous work, we utilized mesoporous-TiO2 and MCM41 in corrosion-resistant coatings and showed that these nanoparticles enhanced the barrier properties of the coatings by reducing the transport paths for the corrosive electrolytes to pass through the coating system [19,20]. However, the synergistic corrosion protection of molecular sieve and graphene has not been reported in the field.…”