Corrosion control by self-healing epoxy coatings

Scientists have studied the corrosion control by autonomous self-healing epoxy coatings based on superabsorbent healing agents.

Aggressive agents present in all types of atmospheres increase the metallic corrosion, which is a dangerous and extremely expensive problem. A common strategy to solve this issue is the use of a thin protective polymer layer or coating. Image source: Peter H - Pixabay (symbol image).

Metallic corrosion is an all-time dangerous and extremely expensive problem. Scientists now present an autonomous self-healing polymer coating based on an epoxy resin and superabsorbent polymer (SAP) blend as an anticorrosion coating. Tailor-made coatings were manufactured by controlling the location of the SAP on the surface, middle, and bottom of the coating. The corrosion behavior and self-healing process of the coatings were analyzed at the macro, micro, and sub-micro scales using Electrochemical Impedance Spectroscopy (EIS).

Anticorrosion performance

The SAP preferentially located at the bottom showed coating resistance values higher than 1 × 1011 Ωcm2 over 10 days of immersion with 3-point defects. This configuration provided the best anticorrosion performance, preventing coating delamination, and protecting the metal from corrosion after surface damage, indicating better barrier properties. The SAP enabled local repair of the crack when in contact with water, minimizing the diffusion of oxygen and electroactive species, which are responsible for the corrosion of a metal.

The study has been published in Progress in Organic Coatings, Volume 182, September 2023.

Event tip

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