Research on the Corrosion Resistance of Waterborne Epoxy Resin Coating Enhanced by Sodium Alginate-Modified Ti 3 C 2 T x

作者：Yongxin Hu, Xiaoyu Mao, Changhua Li, Songlin He, Chuan Fu, Yi He · 发表于：Langmuir · 年份：2025 · DOI：10.1021/acs.langmuir.5c01296 · 被引用次数：5 · 研究领域：MXene and MAX Phase Materials、Metal and Thin Film Mechanics、Advanced materials and composites

The enhancement of dispersion stability and interfacial compatibility of nanomaterials within aqueous epoxy matrices represents a pivotal strategy for augmenting the protective performance and corrosion resistance of coatings. In this study, Ti 3 C 2 T x Mxene functionalized with sodium alginate (TSA) was obtained by introducing sodium alginate (SA) into Ti 3 C 2 T x Mxene (T) to improve the corrosion resistance of aqueous epoxy coatings (EP). The dispersion stability of TSA in aqueous medium was quantitatively assessed via ζ-potential measurements, revealing a significant enhancement in stability compared to the reference material T. The long-term stability of TSA/EP composite coatings was systematically evaluated via electrochemical impedance spectroscopy (EIS). Notably, the charge transfer resistance ( R c ) remained at 5 × 10 7 Ω·cm 2 after a 60-day accelerated aging test, exhibiting exceptional electrochemical durability. Compared with pure EP coating, this value is improved by 2 orders of magnitude. The improvement is attributed to the fact that active −COOH and −OH groups on the surface of SA enhance the interactions between T nanosheets and EP matrix. Specifically, these functional groups form hydrogen bonds or chemical bonds at the interface. Such interfacial bonding mechanisms enhance the compatibility and interfacial adhesion between T and the EP matrix. These conclusions are further supported by manual scratching experiments. The accessibility and greenness of SA ...