Synthesis, characterization and protective functioning of surface decorated Zn-Al layered double hydroxide with SiO2 nano-particles

In this paper, Zn-Al layered double hydroxide particles surface were decorated with SiO2 nanoparticles to investigate the influence of SiO2 nanoparticles presence on molybdate anion loading and release behavior as a corrosion inhibitor. For this purpose, we have synthesis a carbonate-based layered double hydroxide (LDH). Nano SiO2 particles were used to decorate the surface of carbonate-based LDH nano-plates. Molybdate was then intercalated into LDH interlayer space through an ion exchange process. Characterization of the synthesized nano-plates was done by XRD, FTIR, FE-SEM, and ICP tests. The decorated nano-plates were employed in silane coating to investigate and compare their corrosion protective properties using EIS and polarization tests. The results illustrated that the protective functioning enhanced after SiO2 decoration. Moreover, molybdate loaded in SiO2 decorated LDH had a better protective functioning, and provided more extended protection due to its higher loading, and controlled release of molybdate anions.