Three-in-one polymer nanocomposite coating via constructing tannic acid functionalized MXene/BP hybrids with superior corrosion resistance, friction resistance, and flame-retardancy

[Display omitted] •A sustainable strategy was developed to enhance the anti-oxidation properties of BP/MXene nanosheets.•BP nanosheets were introduced for the first time in polymer coatings for anti-corrosion purposes.•The PMXBP/WEP coating demonstrates highest impedance modulus, lowest wear rate, and lowest PHRR. The development of multifunctional polymer coatings is an important step towards more efficient, and sustainable industrial materials. In this study, we utilized green tannic acid functionalized MXene/Black phosphorus (BP) to fabricate 2D/2D nanostructured filler (PMXBP), which was subsequently mixed with waterborne epoxy (WEP) resin to generate binary colloidal dispersions for the preparation of nanocomposite coatings. The results demonstrated that the incorporation of 1 wt% PMXBP nanofiller yielded a notable improvement in the anti-corrosion, tribological, and flame-retardant properties of coatings. Specifically, the constant phase element (double-layer capacitance, CPEdl) of PMXBP/WEP was approximately three orders of magnitude lower than that of the pure coating, the wear rate was reduced by 93.51% compared to the pure coating, and the peak heat release rate (PHRR) was lowered by 42.41% relative to the pure coating. This high-performance and multi-functional coating exhibits significant potential for application in various fields, including building construction, electronics, transportation, etc.