resumo
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
palavras-chave
HYDROTALCITE CONVERSION COATINGS; ACTIVE CORROSION PROTECTION; FILIFORM CORROSION; COATED AA2024-T3; ALUMINUM-ALLOY; PIGMENTS; NANOCONTAINERS; RELEASE; PERFORMANCE; RESISTANCE
categoria
Science & Technology - Other Topics; Materials Science
autores
Poznyak, SK; Tedim, J; Rodrigues, LM; Salak, AN; Zheludkevich, ML; Dick, LFP; Ferreira, MGS
nossos autores
Andrei Salak
Investigador Principal
João Tedim
Professor associado
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal Convidadoagradecimentos
This work was supported by EU FP7 Project