resumo
The preparation of layered double hydroxide (LDH) conversion films on aluminum alloy 2024 substrates is reported. The substrates were subjected to four different surface pre-treatments and the corresponding effect on the obtained films studied by scanning electron microscopy (SEM). The corrosion protection conferred to the underlying substrate was investigated by electrochemical impedance spectroscopy (EIS) and by the scanning vibrating electrode technique (SVET). The results show that the best performances are obtained when a laboratory mixed alkaline/acidic procedure or an industrial pre-treatment are applied before the LDH growth, which contribute for the increase of native oxide aluminum stability. (C) 2013 The Electrochemical Society. All rights reserved.
palavras-chave
ACTIVE CORROSION PROTECTION; X-RAY-DIFFRACTION; MG ALLOY; RESISTANCE; INHIBITION; AA2024-T3; ALUMINUM
categoria
Electrochemistry; Materials Science
autores
Tedim, J; Zheludkevich, ML; Bastos, AC; Salak, AN; Carneiro, J; Maia, F; Lisenkov, AD; Oliveira, AB; Ferreira, MGS
nossos autores
Aleksey Lisenkov
Investigador
André Raposo Bastos de Oliveira
Bolseiro de investigação
Andrei Salak
Investigador Principal
António Alexandre Cunha Bastos
Investigador Auxiliar
Frederico Calheiros Maia
Estudante de doutoramento
João Tedim
Professor associado
Jorge Augusto Oliveira Carneiro
Bolseiro de pós-Doutoramento
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal ConvidadoGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
Projectos
agradecimentos
The authors thank FCT for funding through the project with reference PTDC/CTM-MAT/1515/2012 and CICECO (ref. PEst-C/CTM/LA0011/2013).