Direct Li+ incorporation during the anodic formation of compact TiO2 layers.

In this work, compact titanium oxide layers are formed by anodization in 1 M H3PO4 aqueous electrolyte containing LiClO4. Elastic Recoil Detection Analysis (ERDA) measurements demonstrate that incorporation of lithium ions occurs during anodization, and cell-voltage transient measurements evidence the different electronic properties of Li-doped TiO2 layers. The mechanism of direct incorporation of Li during the fabrication of TiO2 layers is discussed.

Novel inorganic host layered double hydroxides intercalated with guest organic inhibitors for anticorrosion applications.

Zn-Al and Mg-Al layered double hydroxides (LDHs) loaded with quinaldate and 2-mercaptobenzothiazolate anions were synthesized via anion-exchange reaction. The resulting compounds were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy/energy-dispersive X-ray spectroscopy. Spectrophotometric measurements demonstrated that the release of organic anions from these LDHs into the bulk solution is triggered by the presence of chloride anions, evidencing the anion-exchange nature of this process. The anticorrosion capabilities of LDHs loaded with organic inhibitors toward the AA2024 aluminum alloy were analyzed by electrochemical impedance spectroscopy. A significant reduction of the corrosion rate is observed when the LDH nanopigments are present in the corrosive media. The mechanism by which the inhibiting anions can be released from the LDHs underlines the versatility of these environmentally friendly structures and their potential application as nanocontainers in self-healing coatings.