Corrosion protection enhancement of Mg alloy WE43 by in-situ synthesis of MgFe LDH/citric acid composite coating intercalated with 8HQ

A composite coating consisting of Mg-Fe LDH intercalated with 8-hydroxyquinoline (8HQ) and modified with citric acid (CA) layer is constructed on Mg alloy WE43 via combination of electrodeposition, hydrothermal and anion-exchange. In view of CA and their small island-shaped surface morphology, the CA coating could provide MgFe LDH film with physical and chemical shielding. The intercalation of 8HQ into the MgFe LDH/0.05CA saw further enhancement in corrosion resistance as 8HQ hinders anodic and cathodic dissolution reaction. Furthermore, the MgFe-8HQ LDH/0.05CA coating presented a possible self-healing based on the 7-day EIS study, establishing as a potential coating for biomedical implant applications.

Automated summary

A composite coating of Mg-Fe LDH intercalated with 8-hydroxyquinoline (8HQ) and modified with citric acid (CA) is fabricated on Mg alloy WE43 through a combination of electrodeposition, hydrothermal process, and anion-exchange. The CA coating provides physical and chemical shielding to the MgFe LDH film, while intercalation of 8HQ enhances corrosion resistance by hindering dissolution reactions. The MgFe-8HQ LDH/0.05CA coating exhibits potential self-healing properties, making it a promising candidate for biomedical implant applications based on a 7-day EIS study.