Self-healing capability of porous polymer film with corrosion inhibitor inserted for corrosion protection

Porous polymer films with varying pore sizes were prepared by changing the evaporation time of an organic solvent. A specimen was prepared consisting of porous polymer film containing corrosion inhibitor coated onto carbon steel. The specimens were scratched with a knife-edge, and the polarization resistance was monitored in a sodium chloride solution. An increase in polarization resistance was confirmed, and the films with larger-sized pores demonstrated a higher self-healing capability.

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► Porous polymer film containing corrosion inhibitor was coated onto carbon steel.
► The polarization resistance of the scratched specimen increased with time.
► The porous film with the largest pores had the highest self-healing capability.
► The self-healing effect was due to the diffusion release of corrosion inhibitor.