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The corrosion of metallic materials is of significant importance on an economical and ecological scale.[1] A straightforward way to protect metal against corrosion is the application of coatings, which act as barriers to water and ions that cause corrosion. Once the coating is damaged, water and ions can freely reach the metal surface, thus initiating corrosion and causing a breakdown of the coating. To enhance the corrosionprotection performance of the coatings, corrosion inhibitors are added to the coating systems. The most efficient corrosion inhibitors are based on Cr VI+. However, the use of Cr VI+ has now been widely restricted by law in the European Union due to ecological and toxicological issues.[2] This fact has initiated intensive research activities in the field of self-healing coatings in the search for an alternative to the use of Cr VI+ for corrosion protection.[1a, 3]

Self-healing coatings investigated so far are …