Preparation and Corrosion Resistance Performance of Rare Earth Lanthanum/Graphene Superhydrophobic Composite Coatings on Copper Surface by One-Step Electrodeposition Method

Abstract

The tendency of marine corrosion is an important factor that restricts the performance and safety of copper-based materials. Therefore, improving the corrosion resistance of copper surfaces has become a research focus. In this study, the lanthanum myristic acid/graphite oxide(LaM/GO) superhydrophobic composite coatings were prepared on the surface of copper substrates by a one-step rapid electrodeposition process. The structure and properties of the composite coating were characterized using scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), water contact angle measurement and electrochemical testing methods. Results showed that the surface of the electrodeposited cathode produced low surface energy materials and petal-shaped micro-nano rough structures. The static water contact angle and rolling angle of the coating surface were measured as 154° ± 3° and 5° ± 3°, respectively. The dynamic polarization curve measurement of the potential showed that the corrosion potential on the surface of superhydrophobic composite coatings increased, the corrosion current density decreased by more than two orders of magnitude, and the corrosion inhibition efficiency reached 99.34%, indicating that the corrosion resistance had been significantly improved. In addition, the surface of the obtained superhydrophobic composite coating exhibited excellent anti-fouling performance and mechanical stability.

Keywords

• one-step electrodeposition; graphene oxide; lanthanum myristic acid; super hydrophobic coating; copper; corrosion resistance