Smart epoxy coating with mesoporous silica nanoparticles loaded with calcium phosphate for corrosion protection

• Published in: Progress in organic coatings Vol. 165; p. 106740
• Main Authors: Lamprakou, Zoi, Bi, Huichao, Weinell, Claus Erik, Tortajada, Silvia, Dam-Johansen, Kim
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-04-2022; Elsevier BV
• Subjects: Calcium phosphates; Corrosion; Corrosion prevention; EIS; Electrochemical impedance spectroscopy; Encapsulation; Epoxy coatings; Epoxy primer; Inhibitive pigment; Nanoparticles; Open circuit voltage; Performance evaluation; Silicon dioxide; Encapsulation; Inhibitive pigment; Corrosion; Epoxy primer; EIS
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2022.106740

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.
•Calcium phosphate was encapsulated into Mesoporous Silica Nanoparticles (MSN).•pH-dependent release of calcium phosphate from MSN has been verified.•Smart coating showed better anticorrosive performance than conventional coating.