Research and development of heat-resistant coating based on polyaluminium phosphate (PAP) synthesized from aluminum slag

This study presents the development of a heat-resistant coating based on polyaluminium phosphate (PAP) synthesized from aluminum slag and phosphoric acid. The coating formulation included inorganic fillers such as SiO₂, TiO₂, talc, and Samot powder. The resulting coating exhibited strong adhesion (rated 5B per ASTM D3359), maintained structural integrity after exposure to temperatures up to 750 °C, and showed a total mass loss below 10% in thermogravimetric analysis (TGA). Structural and morphological analyses (SEM, XRD, EDX) confirmed the formation of stable crystalline phases including AlPO₄ and SiO₂. These findings support the potential application of aluminum slag-derived PAP coatings in high-temperature environments, contributing to sustainable and cost-effective material development.