Bioactive cross-scale interfacial functionalization: improve the seawater corrosion resistance of basalt fiber composite insulation material

Abstract

To improve the poor interfacial bonding between basalt fiber reinforced composite materials in marine environments and promote their application in large-scale electrical equipment. The paper uses chitosan and polydopamine nanoparticles to create a cross-scale structure on the basalt fiber surface. It also provides a detailed analysis of the infiltration properties of basalt fiber after coating treatment and conducts experiments on seawater corrosion for the composite material (DCS-BFRP). These experiments demonstrate the improved corrosion resistance of the composite. Biocative coatings by testing the electrical, mechanical, and physical properties of DCS-BFRP. Results show that, compared to commercial basalt fibers, coating treatment effectively improves hydrophilicity and tensile strength, increasing surface energy by 26.10%, permeability by 63.52%, and TFBT strength by 34.82%, while promoting a more prominent interfacial bonding effect. After seawater corrosion, the breakdown strength retention rate of DCS-BFRP reached 72.57%, the dielectric loss factor increased to 1.25%, the bending strength retention rate reached 75.59%, the self-corrosion current density decreased by 24.54%, and it has stronger hydrolysis resistance and higher glass transition temperature. The cross-scale composite bioactive coating combines the advantages of both "rigid" and "soft" transition layers. It resists the erosion of corrosive media on the fibers, improves the seawater corrosion resistance of DCS-BFRP, and provides a reference for the research and development of environmentally friendly special infiltration agent for basalt fibers.