CoAl(2)O(4)/Kaoline Hybrid Pigment Prepared via Solid-Phase Method for Anticorrosion Application

In this study, kaoline is incorporated to prepare CoAl(2)O(4)/kaoline hybrid pigments via traditional solid-state reaction, and the introduction of kaoline decreases the preparation temperature for formation of spinel CoAl(2)O(4), and reduces the production cost of cobalt blue as well. More importantly, kaoline may participate in the crystallization of spinel CoAl(2)O(4) during calcining process, and the hybrid pigments prepared using 8.1% Co(3)O(4) and 81.5% kaoline features bright blue and good chemical resistance. Due to the synergistic effect between the sheet-like kaoline and the loaded CoAl(2)O(4), the as-prepared CoAl(2)O(4)/kaoline hybrid pigments can be incorporated into epoxy paint system to obtain the high-performance blue anticorrosion coating, especially for acetic acid-salt fog corrosion.