Fabrication of smart, environmentally friendly anti-corrosion coating for petroleum equipments
Abstract
In this research, a smart epoxy (EP) coating was fabricated based on halloysite nanotubes (HNTs) containing the corrosion inhibitor sodium molybdate (Na2MoO4), and polyurea-formaldehyde microcapsules (UFMCs) loaded with linseed oil (LO) in a core-shell structure (UFMCs/LO corresponding to core/shell composition) with self-healing function. The structural, bonding, morphological, and thermal properties of the composites were characterized using XRD, FT-IR, SEM, EDX and TGA. The smart self-healing function of this coating is demonstrated by the ability of the core-shell microcapsules to release LO and fill the cracks when corrosion occurs, achieving a self-healing efficiency of about 66% as observed in SEM images. The anti-corrosion ability of this coating was evaluated by electrochemical impedance spectroscopy (EIS) and salt spray tests. Salt spray results show that the smart EP coating maintains its properties after 888 hours of exposure. The mechanical properties, including adhesion, hardness, impact resistance, and flexural strength, were also measured. The experimental results indicate that the smart EP coating is well-suited for the harsh conditions for equipment and structures in the petroleum industry.
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