Yang Han,Xude Qin,Qianqian Kang,Weijie Fan,Dongxiao Han,Yantong Pei,Ye Chen,Wei Wang
Self-healing coating technology is an emerging strategy for extending the longevity of anticorrosion coating. Nevertheless, a significant challenge lies in ensuring that the coating can endure multiple cycles in intricate environments while sustaining a stable mechanical performance. In this study, we prepared a TiO2/Ti3C2Tx/PDMS elastomer coating by incorporating Ti3C2Tx nanosheets to improve mechanical properties and enhance physical barrier performance through photografting. Compared to PDMS without TiO2/Ti3C2Tx, the tensile strength increased from 10.32 to 16.24 MPa. Even after undergoing multiple loading–unloading cycles, the elastomer retained 88.98% of its initial strength, demonstrating remarkable durability and self-healing capabilities. Due to the presence of dynamic disulfide bonds, the coating can undergo a self-healing process within 30 min under 60 °C heating conditions. Furthermore, the presence of TiO2/Ti3C2Tx modified through photografting enhanced hydrophobicity and formed a micro/nanolayered “maze effect” structure, establishing a passive anticorrosion mechanism. This structure demonstrated sustained corrosion resistance for up to 50 days in aggressive environments, effectively preventing the corrosive medium from compromising the metal substrate.
In this study, we have developed a water-based aluminum phosphate (WAP) coating consisting of a base layer and a surface layer. Graphene oxide (GO) was used to modify the base layer. Three different GO concentrations—0.5, 0.75, and 1 wt.%—were employed to assess their impact on the corrosion resistance of the coating and to explore the underlying mechanisms. The corrosion resistance mechanism was also examined. In the coating, GO combined with phosphate to form large blocks that effectively blocked the pores, and the porosity decreased with the increase in GO content. This led to an improvement in the substrate protection efficiency by over 10%. Impedance spectroscopy revealed that the main mechanism behind the enhanced corrosion resistance was the shielding effect of GO, which created a “maze effect” that improved the coating’s protective properties. However, an excessive amount of GO reduced the corrosion resistance of the coating. Overall, the WAP coating modified with 0.75 wt.% GO exhibited the best corrosion resistance.
This study fabricated two composite anticorrosion coatings based on a waterborne epoxy resin matrix, incorporating TC4 alloy powder and TiO2 nanoparticles, respectively, with mineral powder hybridization to enhance performance and reduce material costs. Salt spray testing demonstrated that both systems maintained stability in corrosive environments for over 30 days. However, the TC4-based coating exhibited local edge warping on day 10, indicative of insufficient interfacial adhesion and structural instability. In contrast, the TiO2 composite coating retained structural integrity throughout the test period, demonstrating superior corrosion resistance. Characterization analyses (SEM, TEM, EDS, FTIR, UV–Vis) revealed that TiO2 particles achieved better dispersion and interfacial binding capacity, effectively minimizing pore formation and structural defects. The dense oxide layer on TiO2 surfaces amplified the “maze effect,” significantly inhibiting corrosive medium penetration. Cross-cut adhesion testing and impact resistance evaluation further confirmed the TiO2 system's advantages in interfacial bonding strength and mechanical robustness over the TC4 counterpart. Collectively, the TiO2–mineral hybrid coating demonstrates superior comprehensive protection properties and greater engineering application potential, offering a novel strategy for designing cost-effective, high-performance waterborne epoxy anticorrosion materials.
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