Graphene—CorrosionInhibitingCoating

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We report the use of atomically thin layers of graphene as a protective coating that inhibits
corrosion of underlying metals. Here, we employ 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. Cyclic voltammetry measurements
reveal that the graphene coating e ff ectively suppresses metal oxidation and oxygen reduction.
Electrochemical impedance spectroscopy measurements suggest that while graphene itself is
not damaged, the metal under it is corroded at cracks in the graphene fi lm. Finally, we use
Tafel analysis to quantify the corrosion rates of samples with and without graphene coatings.
These results indicate that copper fi lms coated with graphene grown via chemical vapor
deposition are corroded 7 times slower in an aerated Na 2 SO 4 solution as compared to the
corrosion rate of bare copper. Tafel analysis reveals that nickel with a multilayer graphene fi lm
grown on it corrodes 20 times slower while nickel surfaces coated with four layers of
mechanically transferred graphene corrode 4 times slower than bare nickel. These fi ndings
establish graphene as the thinnest known corrosion-protecting coating.

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