Abstract
NiFeP/MgAl 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 NiFeP/MgAl LDH (the following are all expressed as NiFeP/LDH) composite coatings were investigated. The deposition mechanism of the NiFeP/LDH alloy was rationalised. The results show that the MgAl LDH nanosheets were uniformly distributed in the NiFeP coating due to ion adsorption. The corrosion potential of NiFeP coatings in 3.5 wt% NaCl solution at 25 °C was −0.458 V vs. SCE, while the corrosion potential of NiFeP/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 NiFeP/LDH composite coating was much higher than that of the NiFeP coating. The two-dimensional lamellar nanomaterial LDH was good reinforcement phases for the NiFeP matrix.
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