Synthesis of Lithium-exchange Silica Particles for Corrosion Protection of Aluminum Alloys

Abstract

This study focuses on the synthesis of lithium-exchange silica (Si/Li) particles and their corrosion protection for aluminum alloy substrates. Silica is synthesized via a sol-gel method as a raw material to prepare Si/Li in a saturated lithium nitrate solution. The obtained samples are characterized by X-ray diffraction, field emission scanning electron microscopy, zeta potential measurements, Fourier transform infrared spectroscopy, and inductively coupled plasma mass spectroscopy. Inhibition properties of synthesized Si/Li are investigated by electrochemical impedance spectroscopy (EIS). The results show that Si/Li prepared in the saturated lithium nitrate solution has a high content of loaded lithium. This amount relates to a high and stable corrosion protection of Si/Li in the electrolyte solution for the aluminum alloy substrate. After 96 h of immersion in the electrolyte solution, electrochemical results show a high value of an inhibition efficiency up to 98%. Water-based epoxy coatings containing Si/Li are also prepared to highlight their corrosion protection efficiency for the aluminum alloy substrate. Concerning the EIS measurement results, the coating containing 5 wt% Si/Li shows high and stable barrier properties for a long immersion time in the protection of the aluminum alloy substrate.

Corrosion Inhibition of Galvanized Steel by Cobalt(II) Nitrate

“…In particular, a crystal structure like layered-double hydroxide is found in Figure 9(b), suggesting the formation of a protective Zn-Co layer as a result of the inhibitive reaction of Co 2+ . This layered morphology is commonly observed when using a metallic salt as an inhibitor for the protection of alloys [15,25,26]. When analyzed the surface by XRD (Figure 10), an existence of zinc cobalt hydroxide Zn 2 Co 3 (OH) 10 •2H 2 O as a principal product was reported (52.5%).…”