Metal coating created that repairs itself.

From Technology Review:

Airplanes, cars, and ships that don't corrode are the promise of self-healing paint coatings and polymer materials. Now researchers at the Fraunhofer Institute for Manufacturing Engineering and Automation and the University of Duisburg-Essen in Germany have come up with a metal coating that may be able to repair itself after sustaining damage.

The self-healing metal can be electroplated, which opens up applications in construction, car manufacturing, and other industries that use or manufacture steel machines. (Nuts, bolts, and screws made of steel, which is susceptible to corrosion, are already electroplated with rustproof metals such as zinc and chromium.)

The new coating is around 15 micrometers thick and contains polymer capsules a few hundred nanometers in diameter. When the plating is scratched, the capsules should burst and release their contents - which could be a polymer capable of sealing the crack, or corrosion-inhibiting liquids.