resumo
Suppression of electrochemical activity (cathodic activity) on CFRP surface at cathodic potentials consistent with galvanic coupling of CFRP with active metals like aluminium and zinc have been demonstrated by electrochemical treatment of CFRP surface in the presence of sodium dodecyl sulphate (SDS). Modification to the CFRP surface by SDS adsorption was established using electrochemical impedance spectroscopy, cyclic voltammetry, and confocal Raman spectroscopy and atomic force microscopy. Electrochemical test results indicate interaction of SDS with CFRP with persistent effects, manifesting in a sustained suppression of electrochemical activity even after washing the treated CFRP surface. Mitigation of CFRP degradation under cathodic polarization in the presence of SDS and/or after prior exposure to SDS was established from scanning electron microscopy. Based on results obtained herein, plausible mechanisms/configurations involved in SDS interaction(s) with carbon fibre surfaces of the CFRP composite (that most probably account for reduced cathodic activity) were postulated.
palavras-chave
ATOMIC-FORCE MICROSCOPY; PYROLYTIC-GRAPHITE; GALVANIC CORROSION; ELECTRON-TRANSFER; OXYGEN REDUCTION; BASAL-PLANE; DIFFERENTIAL CAPACITANCE; ORDERED GRAPHITE; ELECTROCHEMICAL PERFORMANCE; COMPOSITES
categoria
Chemistry; Materials Science; Physics
autores
Ofoegbu, SU; Yasakau, K; Kallip, S; Nogueira, HIS; Ferreira, MGS; Zheludkevich, ML
nossos autores
Helena Isabel Seguro Nogueira
Professor Auxiliar com Agregação
Kiryl Yasakau
Investigador Auxiliar
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Silvar Kallip
Investigador Auxiliar
Stanley Udochukwu Ofoegbu
ColaboradorGrupos
G1 - Materiais Porosos e Nanossistemas
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
Projectos
Corrosion adn corrosion protection in multi-material systems (PTDC/CTM/108446/2008)
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
PROAIR - Active PROtection of multi-material assemblies for AIRcrafts (PROAIR)
agradecimentos
Funding from FCT project: Corrosion and Corrosion Protection in Multi-material Systems, (PTDC/CTM/108446/2008), and European FP7 project: Active PROtection of multi-material assemblies for AIRcrafts [ PROAIR (PIAPP-GA-2013-612415)] are acknowledged. S.U. Ofoegbu and S. Kallip acknowledges Fundacao para a Ciencia e a Tecnologia (FCT) Portugal for doctoral (SFRH/BD/75167/2010) and post-doctoral (SFRH/BPD/64580/2009) grants respectively. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.