1 Introduction Outstanding chemical inertness, impermeability, and toughness qualify graphene to be an ideal and unique coating material for corrosion resistance.[1-10] As a result, just 1–2 atomic layers of graphene coating developed by chemical vapor deposition (CVD) has been reported to improve the corrosion resistance of copper by two orders of magnitude in an aggressive aqueous chloride solution, as demonstrated by the impedance at the lowest frequency to be two orders of magnitude...