Electrostatically assembled Zn2+–GO–LDH hybrid coating on Mg alloy with excellent anticorrosion and antibacterial properties

Herein, a graphene oxide (GO)-hybridized Mg–Fe–layered double hydroxide (LDH) coating loaded with zinc ion (Zn²⁺) was grown vertically on Mg alloys via electrostatic assembly. These LDH nanosheets could effectively attract and anchor GO nanosheets, considerably improving the anticorrosion, cell adhesion, and cell proliferation properties of the Mg substrate. Meanwhile, Zn²⁺ was loaded onto the coating via the negatively charged GO surface to enhance their antibacterial activity against Escherichia coli and Staphylococcus aureus. Thus, the designed multilayer coating provides a new platform to address the current shortcomings, including rapid corrosion and insufficient antibacterial activities, using Mg-based alloys as bone implants.