Novel Inorganic Host Layered Double Hydroxides Intercalated with Guest Organic Inhibitors for Anticorrosion Applications

authors	Poznyak, SK; Tedim, J; Rodrigues, LM; Salak, AN; Zheludkevich, ML; Dick, LFP; Ferreira, MGS
nationality	International
journal	ACS APPLIED MATERIALS & INTERFACES
author keywords	layered double hydroxides; organic inhibitors; corrosion; nanocontainer; aluminum alloy
keywords	HYDROTALCITE CONVERSION COATINGS; ACTIVE CORROSION PROTECTION; FILIFORM CORROSION; COATED AA2024-T3; ALUMINUM-ALLOY; PIGMENTS; NANOCONTAINERS; RELEASE; PERFORMANCE; RESISTANCE
abstract	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 chat 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 race 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
publisher	AMER CHEMICAL SOC
issn	1944-8244
year published	2009
volume	1
issue	10
beginning page	2353
ending page	2362
digital object identifier (doi)	10.1021/am900495r
web of science category	Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category	Science & Technology - Other Topics; Materials Science
unique article identifier	WOS:000271105000037