A novel noise-reducing and anti-corrosion polyurethane elastomer coating material modified by MXene / porous TiO2

The present study reports on a composite coating exhibiting noise reduction and anti-corrosion properties. We successfully synthesized a Ti 3 C 2 T x @TiO 2 -PDA composite filler that involves growing porous TiO 2 onto lamellar MXene (Ti 3 C 2 T x) material and further coating both surfaces with a layer of polydopamine (PDA) material, providing the coating material with a micro-cavity structure to enhance its ability to dissipate acoustic energy and resist corrosion. And we incorporated it into the prepared disulfide bond-modified polyurethane coating matrix. Experimental tests and finite element analysis demonstrate that the coating can reduce environmental noise by approximately 33% while maintaining a maximum impedance modulus |Z| of 5.51 × 10 7 Ω·cm 2 after immersion in a 3.5 wt% NaCl solution for 25 days. The porous structure of the composite filler provides micro-cavities within the coating, while its lamellar structure acts as a physical barrier against corrosive media. Furthermore, introducing disulfide bonds enhances acoustic energy dissipation within the coating. Consequently, this coating exhibits exceptional corrosion resistance and noise reduction performance, presenting significant potential for applications in marine equipment's noise reduction and corrosion prevention.