Smart epoxy coating with mesoporous silica nanoparticles loaded with calcium phosphate for corrosion protection
Zoi Lamprakou, Huichao Bi, Claus Erik Weinell, Silvia Tortajada, Kim Dam‐Johansen
Abstract
Calcium phosphate was encapsulated into mesoporous silica nanoparticles (MSN). The effect of pH on the structure and morphology of the MSN and the release of calcium phosphate from the MSN was investigated. Epoxy coatings with encapsulated (3 wt%) and non-encapsulated (3 wt% and 5 wt%) calcium phosphate were formulated and their anti-corrosive performance was evaluated by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) techniques. Results showed that encapsulation of the calcium phosphate as inhibitive pigment in the coating can enhance the anti-corrosive performance by preventing spontaneous pigment dissolution and controlling the pigment's release from the coating.