Preparation and Properties of Waterborne Anti‐Corrosion Coatings Composited With Organotitanium and <scp>TC4</scp> / <scp> TiO ₂ </scp> Ultrafine Powders

ABSTRACT This study successfully developed a waterborne anti‐corrosion coating composited with organotitanium and TC4/TiO 2 ultrafine powders, and systematically investigated its microstructure, phase composition, and long‐term anti‐corrosion performance. The corrosion resistance was optimized by adjusting the ratios of TC4 and TiO 2 and incorporating auxiliary fillers including organic titanium and carbon powder. The underlying mechanism was elucidated using SEM, TEM, EDS, XRD, FTIR, electrochemical tests, and salt spray testing. The optimized coating formulation was: 50 wt% epoxy resin, 7.5 wt% TC4 alloy, 8 wt% organic titanium, 5 wt% carbon powder, 7.5 wt% TiO 2 , 1 wt% dispersing agent, 1 wt% water, and 20 wt% curing agent. A synergistic effect among these components significantly reduced porosity and promoted the formation of a protective film. Furthermore, organic titanium formed TiOR bonds with the substrate and fillers, creating a cross‐linked macromolecular network that stabilized the hybrid system. The optimized coating exhibited excellent performance, achieving Grade 1 adhesion, 6H hardness, and 50 kg·cm impact resistance. Salt spray testing revealed a corrosion resistance exceeding 720 h, which translates to a protective lifespan improvement of over 1.8 times compared to conventional waterborne epoxy coatings.