abstract
Self-healing protective coatings based on different types of nanocontainers of corrosion inhibitors have been recently developed and reported as promising solutions for many industrial applications. Layered double hydroxide (LDH) nanocontainers are among the most interesting systems since they confer the delivery of inhibitors on demand under action of corrosion-relevant triggers such as the presence of corrosive anions or local change of pH. In this paper, we report for the first time a new approach based on formation of a nanostructured LDH-container layer directly on the metal surface as a result of conversion reaction with a metal (aluminium alloy 2024) surface. The methodology allows the formation of a spatially differentiated LDH structure preferentially on surface sites located at active intermetallics. The LDH container layer loaded with vanadate ions provides an efficient active corrosion protection and can be used as a functional layer in self-healing coating systems.
keywords
DOUBLE HYDROXIDE FILMS; CORROSION PROTECTION; CONVERSION FILM; MG ALLOY; RESISTANCE; ALUMINUM; NANOCONTAINERS; COATINGS; DIFFRACTION; INHIBITION
subject category
Chemistry; Materials Science
authors
Tedim, J; Zheludkevich, ML; Salak, AN; Lisenkov, A; Ferreira, MGS
our authors
Aleksey Lisenkov
Researcher
Andrei Salak
Principal Researcher
João Tedim
Associate Professor
Mário Guerreiro Silva Ferreira
Retired Professor
Mikhail Zheludkevich
Invited Principal Researcheracknowledgements
JT thanks FCT for Post-Doctoral grant (Ref. SFRH/BPD/64335/2009). FCT projects PTDC/CTM/65632/2006 and REDE/1509/RME/2005 are acknowledged as well.