Researchers discovered that Graphene could provide the world's thinnest metal coating to protect against corrosion. They tested two types of graphene coating: one that is directly made on copper or nickel, and the second was transferred onto another metal. They both provided protection against corrosion. The graphene provides the same corrosion protection as conventional organic coating that is more than five times thicker.
In the first experiment it was discovered that if you use CVD to grow a single layer of graphene on copper it slowed the corrosion - in fact the coated copper corroded seven times slower than bare copper. In a second experiment, Nickel was coated with multiple layers of graphene and it corroded 20 times slower than bare nickel.