Preparation, anticorrosion mechanism, and application of nano-Ti polymer-containing coating

Abstract

The anticorrosion performance and weathering resistance of a nano-Ti polymer-containing functional coating fabricated via a combination of spraying and brushing techniques were investigated. The effects of the nano-Ti polymer content on the structure and properties of the coating were investigated systematically, and the corrosion mechanism of the coating was elucidated. The results showed that the nano-Ti polymer coating was uniform and dense. With increasing nano-Ti polymer content, the thermal stability and glass-transition temperature of the coating increased. The glass-transition temperature was highest (206.1 °C) at a nano-Ti polymer content of 9 %. After immersion for 458 days in 3.5 wt% NaCl at room temperature, 125 days of neutral salt spray, and 200 days of ultraviolet aging, the coating was still intact, demonstrating its excellent anti-penetration performance, anticorrosion performance, and weathering resistance. Electrochemical impedance spectroscopy results confirmed the excellent corrosion protection of the 9 % nano-Ti polymer coating, which exhibited the highest corrosion resistance (9.3 × 108 Ω·cm2).