Self-Healing Abilities of Shape-Memory Epoxy-Contained Polycaprolactone Microspheres Filled with Cerium(III) Nitrate Coated on Aluminum 2024-T3

Abstract

The shape-memory epoxy (SME) mixed with 10 wt % polycaprolactone (PCL) microspheres containing 5% cerium(III) nitrate (Ce(NO 3 ) 3 ) (PCL5Ce) was coated on an aluminum plate 2024-T3 to investigate the self-healing property. The coating was scratched and heated at 80 °C for 30 min to activate the self-healing mechanism and compare with a nonscratched coating. Surface morphology was investigated by scanning electron microscopy. The scratch was completely healed by the PCL5Ce via a thermally assisted self-healing process. Based on electrochemical impedance spectroscopy, the postheated scratched coating had shown impedance values close to the nonscratched coating, which indicated that corrosion resistivity was restored. Ce(NO 3 ) 3 content at the scratched area was analyzed by focused ion beam–scanning electron microscopy. The scratch width was healed and filled with Ce(NO 3 ) 3 . Therefore, PCL5Ce is capable of being used as an enhancing additive for the self-healing performance in SME coating.

Superhydrophobic Coatings with Photothermal Self-Healing Chemical Composition and Microstructure for Efficient Corrosion Protection of Magnesium Alloy

“…Second, the shape-memory effect can effectively repair the physical scratches of the coating. This is because SMPs can restore their original shape via external stimuli, for example, heat, electricity, and light. − Also, microcrystalline wax and BTA were added in the SMP primer. Microcrystalline wax can improve the self-healing performance of SMP coatings, for it is helpful to seal scratches .…”

Encapsulation of Cerium Nitrate within Poly(urea-formaldehyde) Microcapsules for the Development of Self-Healing Epoxy-Based Coating

“…To assess the self-healing performance of the coatings, the EIS tests were performed on the scratched epoxy coatings in 0.6 M NaCl solution. Figure shows the Bode results of the coatings after 1 day and a week of immersion.…”

Preparation and characterization of amphiphilic, biodegradable, waterborne polyurethanes without using organic solvent and catalyst

“…Hence, PCL itself and its derivatives, especially its composites, are widely used in biodegradable and anti-corrosion formulations. 22,23 WPU can be easily made biodegradable by introducing biodegradable components, such as ester-based diols into the so segments of WPU. 24 As mentioned above, the introduction of PCL into WPU can improve the biodegradability of WPU and also enhance its mechanical properties.…”

“…Hence, PCL itself and its derivatives, especially its composites, are widely used in biodegradable and anti-corrosion formulations. 22,23…”