Self-healing coatings using superabsorbent polymers for corrosion inhibition in carbon steel

Multi-layer coatings consisting of superabsorbent and vinyl-ester polymers were applied to carbon steel to prevent corrosion. The polarization resistance of a scratched specimen was monitored in a corrosive solution. The polarization resistance of a 3-layer coating, which consisted of a mixed polymer as the middle layer and a vinyl-ester polymer as the base and top layers, increased with time, resulting in a self-healing corrosion inhibition capability. A film, which consisted of spherical particles, was found on the scratched surface of a substrate. The film may have prevented the diffusion of oxygen to the scratched surface. (C) 2012 Elsevier Ltd. All rights reserved.