▎ 摘　　要

Direct and fast synthesis of protective coating on metal surfaces is a major challenge in anti-corrosion applications of 2D graphene. In this article, we provided an approach to this challenge by using radiofrequency plasmas, where the mixture of CH4/H2 or pure CH4 gases can be decomposed under low temperature while the temperature of the Cu foil substrates can still be kept high by the induced eddy current. The high substrate temperature is essential for enhancing graphene quality, but many other plasma synthesis techniques seldom addressed this point. Graphene coatings with thicknesses of about 30 nm could be obtained in 3.5 min. Anticorrosion tests examine protection coatings under various conditions. In this article, we mainly checked the protection performance of the graphene coatings against Cu oxidization in air. Anti-oxidization tests under 300 degrees C for 360 min proved that the coatings synthesized with pure CH4 performed better over those synthesized with mixture of CH4/H2. Tests under 200 degrees C for 900 min and 22 degrees C for 111 days demonstrated that the coatings synthesized with different gas compositions had equivalent anti-oxidization capabilities. Our calculations with density functional theory revealed that the defective single-layered graphene was unable to protect the Cusubstrate , it would be better to use multi-layered graphene in practice. The synthesis technique in this article could also be used in many other areas beyond anti-oxidization such as chemical reaction catalysis, electrode materials, electromagnetic interference shielding , so on.