Enhancing frictional and corrosion resistance performance in aluminum alloy through in situ growth of NiZnAl-LDH membrane and its modification

Anodized aluminum, due to its inherent porous channels and thin protective layer, exhibits poor corrosion resistance and friction performance in severe environments. In this study, an in-situ growth of a NiZnAl-LDH composite coating was developed on the surface of aluminum. Sodium molybdate and ricinoleic acid were used to modify the coating, enhancing both corrosion resistance and friction performance. Various tests, including SEM, infrared, XPS, XRD, and others, were conducted to analyze the structure, composition, and properties of the synthesized coating. The results confirmed the successful synthesis of NiZnAl-LDH with nitrate intercalation, which were subsequently converted to molybdate intercalation through sodium molybdate modification. Electrochemical tests revealed that the corrosion current decreased by a factor of two compared to a plain LDH coating. Friction experiments demonstrated that the co-modified coating exhibited a minimal friction coefficient of 0.23, outperforming the original LDH coating.