In this area, we critically examine some of the current hypotheses of anti-corrosion coatings, and aim to create self-healing coatings that can prevent or mitigate localized corrosion of metal structures.
Barrier coatings can retard corrosion by isolating underlying metal from reactive environments. Pinholes and other minor damages (e.g., cracks and scratches) only expose small areas of metal. However, reactions at these sites could develop into dangerous localized corrosion, which is often responsible for initiating catastrophic failures of metal structures, such as the collapse of the Silver Bridge in 1967, and the incident of fuselage cracking of Southwest Flight 812 in 2011.
Cathodic coating (e.g., tin plated steel) is not scratch-tolerant, and can accelerate local corrosion