Abstract
Nanocomposites incorporating impermeable two-dimensional materials offer promising solutions for safeguarding metals against corrosion. Here, we explore the integration of [3-(2-aminoethylamino)butyl]triethoxysilane (ABES) functionalized tantalum nitride (Ta3N5) into a coating matrix, leveraging Ta3N5's exceptional chemical and thermal stability to enhance the barrier effect. When combined with graphitic carbon nitride (GCN) within polyurethane (PU), functionalized Ta3N5 contributes to enhanced corrosion resistance and fire-retardant capabilities. Evaluation of aluminium's protective behavior in chloride environments using electrochemical methods reveals significant improvements with varying amounts of functionalized Ta3N5/GCN in PU coatings. The resulting PU composite exhibits superior flame retardation, evidenced by substantial reductions in peak heat release rate (pHRR), total heat release (THR), and total smoke production (TSP) compared to pure PU. Electrochemical impedance spectroscopy (EIS) measurements demonstrate enhanced coating resistance (8.75×10¹¹ Ω.cm²) for PU/functionalized Ta3N5/GCN, even after 45 days of exposure to the electrolyte. Additionally, the newly formulated PU/functionalized Ta3N5/GCN coating exhibits exceptional water repellency, boasting a water contact angle (WCA) of 165°. Regarding mechanical properties, PU/functionalized Ta3N5/GCN displays favorable adhesion strength and hardness within the PU substrate, ensuring sustained integrity even under prolonged immersion. Consequently, this nanocomposite holds promise as a valuable coating component in aerospace applications. Therefore, the integration of functionalized Ta3N5/GCN within the PU matrix represents a novel approach to developing multifunctional coatings with improved performance across various metrics essential for aerospace materials. This work contributes significantly to advancing the field by offering novel solutions for corrosion protection and fire resistance, setting a new standard for the development of advanced coatings in aerospace and beyond.
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