New research has established graphene as the thinnest known coating for protecting metals against corrosion.In a new study, researchers of the Vanderbilt University (USA) have evaluated graphene as a protective coating that inhibits corrosion of underlying metals. Scientists employed electrochemical methods to study the corrosion inhibition of copper and nickel by either growing graphene on these metals, or by mechanically transferring multilayer graphene onto them.
Test results show that copper coated by growing a single layer of graphene through chemical vapor deposition (CVD) corroded seven times slower than bare copper. Nickel coated by growing multiple layers of graphene corroded 20 times slower than bare nickel. A single layer of graphene provides the same corrosion protection as conventional organic coatings that are more than five times thicker. These findings establish graphene as the thinnest known corrosion-protecting coating.