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
Grupos
3 - materiais de carbono, compósitos e revestimentos funcionais
4 - biorrefinarias, materiais de origem biológica e reciclagem
Projectos
Multifunctional nanostructured conversion films based on Layered Double hydroxides for corrosion protection of aeronautical structures (PTDC/CTM-MAT/1515/2012)
Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2013-2014) (PEst-C/CTM/LA0011/2013)
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).