Influence of Mg-Al layered double hydroxide nanosheets on the structure and properties of Ni-Fe-P composite coatings

Ni-Fe-P/Mg-Al layered double hydroxide (LDH) composite coatings with high corrosion and wear resistance were prepared by electroless deposition. A series of test methods was used to comprehensively evaluate the crystal structure, surface morphology, element composition, roughness of the composite coating. The anti-wear and anti-corrosion performances of Ni-Fe-P/Mg-Al LDH (the following are all expressed as Ni-Fe-P/LDH) composite coatings were investigated. The deposition mechanism of the Ni-Fe-P/LDH alloy was rationalised. The results show that the Mg-Al LDH nanosheets were uniformly distributed in the Ni-Fe-P coating due to ion adsorption. The corrosion potential of Ni-Fe-P coatings in 3.5 wt% NaCl solution at 25 degrees C was 0.458 V vs. SCE, while the corrosion potential of Ni-Fe-P/LDH (0.4 g L-1) was 0.334 V vs. SCE. The coating shows adhesive wear during the friction test. The wear resistance of the Ni-Fe-P/LDH composite coating was much higher than that of the Ni-Fe-P coating. The two-dimensional lamellar nanomaterial LDH was good reinforcement phases for the Ni-Fe-P matrix.

Automated summary

Ni-Fe-P/Mg-Al layered double hydroxide (LDH) composite coatings with high corrosion and wear resistance were prepared. The uniform distribution of Mg-Al LDH nanosheets in the composite coating enhanced the wear resistance of the Ni-Fe-P matrix.