resumo
In this work active corrosion protection of AA2024 by a bilayer system consisting of a LDH (layered double hydroxides) conversion layer coated by a sol-gel film was studied. Impedance and Scanning vibrating electrode technique (SVET) studies demonstrated an efficient active corrosion protection and self-healing abilities of the systems containing LDH layer loaded with vanadate corrosion inhibitor. Microstructural and chemical analysis of the surface after corrosion testing showed accumulation of chlorine signal in LDH coatings. The scavenging of chlorides and release of vanadate inhibitor from LDH can explain high efficiency of corrosion inhibition of AA2024 by the novel protective system.
palavras-chave
ALUMINUM-ALLOY 2024-T3; PURE ALUMINUM; ANODIC-DISSOLUTION; ANION-EXCHANGE; INHIBITION; CHROMATE; FILMS; PERFORMANCE; VANADATE; CERIUM
categoria
Materials Science; Metallurgy & Metallurgical Engineering
autores
Yasakau, KA; Kuznetsova, A; Kallip, S; Starykevich, M; Tedim, J; Ferreira, MGS; Zheludkevich, ML
nossos autores
Alena Kuznetsova
Bolseiro de investigação
João Tedim
Professor associado
Kiryl Yasakau
Investigador Auxiliar
Maksim Starykevich
Investigador Júnior
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal Convidado
Silvar Kallip
Investigador AuxiliarProjectos
Projeto de Investigação Exploratória: Kyril Yasakao (IF/01284/2015)
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
agradecimentos
KY thanks financial support of a Post-Doctoral grant (ref. SFRH/BPD/80754/2011) of the Portuguese Foundation for Science and Technology (FCT) and a researcher grant (IF/01284/2015). 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. SK thanks FCT for researcher grant (IF/00856/2013) and ETAg for grant PUT1033. AK thanks FCT for PhD grant (SFRH/BD/89490/2012). The present work was supported by MULTISURF European project (H2020-MSCA-RISE-2014-645676-MULTISURF).