Layered double hydroxides (LDHs) exhibit anion exchange properties and adjustable characteristics, which make them suitable for applications in the field of anticorrosion. However, the smooth growth pattern of a single LDHs nanosheet limits its effectiveness in blocking corrosive media. Graphene oxide (GO) has a large specific surface area and numerous oxygen-containing functional groups on its surface, which can form strong interactions with polar molecules. This inhibits the migration of small ions, such as Cl−. In this work, Ce was incorporated into a micro-arc oxidation (MAO) coating on the AZ31 alloy by immersion in a cerium salt solution, and GO was incorporated using a hydrothermal solution to prepare layered double hydroxide composite coating (Ce/LDHs-G). The significance of charge transfer resistance (Rct) mainly reflects the charge transfer process at the electrode/electrolyte interface. The Rct of Ce/LDHs-G increased by one order of magnitude compared to MAO coating. The corrosion current density (icorr) of Ce/LDHs-G coating was 3.73 × 10−8 A cm−2, lower than that of MAO coating (1.56 × 10−6 A cm−2). Additionally, the cumulative hydrogen evolution over 336 h was lower, indicating that Ce/LDHs-G coating provides effective corrosion protection for the AZ31 alloy.
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