Multilayered LDH/Microcapsule Smart Epoxy Coating for Corrosion Protection

Area of Science:

• Materials Science
• Corrosion Engineering
• Nanotechnology

Background:

• Corrosion of carbon steel poses significant economic and safety challenges.
• Development of advanced protective coatings is crucial for extending material lifespan.
• Smart coatings with self-healing and pH-responsive properties offer promising solutions.

Purpose of the Study:

• To develop and characterize a multilayered smart epoxy coating for superior corrosion prevention of carbon steel.
• To investigate the synergistic effects of incorporating pH-sensitive inhibitors and self-healing agents.
• To evaluate the enhanced corrosion resistance and self-healing capabilities of the developed coating system.

Main Methods:

• Synthesis of dodecylamine-loaded zinc-aluminum layered double hydroxide (Zn/Al LDH) via hydrothermal crystallization.
• In-situ polymerization to create linalyl acetate-encapsulated urea-formaldehyde microcapsules (LAUFMC).
• Fabrication of double-layer epoxy coatings (DL-EP) integrating Zn/Al LDH and LAUFMC, alongside single-layer and blank epoxy controls, followed by characterization (XRD, XPS, BET, TGA, FTIR, EIS) and electrochemical testing.

Main Results:

• The synthesized Zn/Al LDH and LAUFMC were successfully incorporated into the epoxy matrix.
• Electrochemical tests demonstrated that the double-layer epoxy coating (DL-EP) exhibited significantly improved self-healing properties.
• DL-EP outperformed single-layer coatings (LDH-EP and UFMLA COAT) and the reference coating in corrosion resistance.

Conclusions:

• The developed multilayered smart epoxy coating effectively enhances corrosion prevention for carbon steel.
• The combination of pH-sensitive inhibition and self-healing mechanisms provides superior protective performance.
• This smart coating technology holds potential for advanced anticorrosion applications.