Abstract: Using carbamide as precipitant, Ni2+-Al3+-CO2-3 -LDHs was prepared by homogeneous precipitation method when the Ni/Al molar ratis was 3∶1. Then the corrosion inhibitor of Ni2+-Al3+-MoO2-4 -LDHs was successfully constructed through ion exchange with NaCl and Na2 MoO4 · 2H2 O respectively using Ni2+-Al3+-CO2-3 -LDHs as precursor. The synthesized Ni2+-Al3+-MoO2-4 -LDHs were characterized by XRD, SEM, FT-IR, TG-DTG and ICP. The experimental results show that the basal spacing of the LDHs increases from 0. 769 nm to 0. 982 nm when the MoO2-4 anions insert to the layer space of Ni2+-Al3+-LDHs, which show well-crystalline structure and layered feature.

Key words: Ni2+-Al3+-LDHs;MoO2-4;intercalation