resumo
Layered double hydroxides (LDHs) intercalated with corrosion inhibitive species are considered as promising additives to protection coatings. However, the conventional method of LDH preparation via co-precipitation followed by anion exchange is a water consuming and slow process hardly applicable to industrial use. In this work, a novel approach to LDH synthesis via hydration of sol-gel prepared mixed metal oxides and two-step anion exchange, all assisted by high-power sonication, was applied. Mg-Al and Mg-Al-Ce LDH with cations ratios 2:1 and 2:0.9:0.1, respectively, intercalated with corrosion inhibitive dihydrogen phosphate anion were successfully prepared. The obtained LDH were characterized by X-ray diffraction and scanning transmission electron microscopy. Anion release from these LDH in NaCl solutions and their corrosion inhibitive action on cast iron samples were monitored by electrochemical impedance spectroscopy. The results show that the dihydrogen-phosphate-intercalated LDHs produced using the novel technique are efficient in corrosion protection.
palavras-chave
INTERCALATION
categoria
Materials Science; Physics
autores
Vieira, DEL; Sokol, D; Smalenskaite, A; Kareiva, A; Ferreira, MGS; Vieira, JM; Salak, AN
nossos autores
Andrei Salak
Investigador Principal
Daniel Eduardo Loureiro Vieira
Estudante de doutoramento
Joaquim Manuel Vieira
Professor(a) Jubilado(a)
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)Grupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
Projectos
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
agradecimentos
The work was supported by project MULTISURF. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 645676.; The financial support of P2020 COMPETE and FCT-Portugal through project POCI-01-0145-FEDER-016686 -PTDC/CTM-NAN/2418/2014 (NANOCONCOR) is gratefully acknowledged. The authors acknowledge SEW-EURODRIVE Portugal LDA (www.sew-eurodrive.pt) for collaboration in frame of this project.; The research carried out in the University of Aveiro was in the scope of the project CICECO -Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013).; D. E. L. Vieira acknowledges the financial support of this work through AdvaMtech PhD programme scholarship PD/BD/143033/2018.