abstract
This work reports a novel approach for growing layered double hydroxide (LDH) films on any plasma electrolytic oxidation (PEO) coated AA2024 independently of the nature of the PEO coating. The specific PEO coating chosen to carry out this work is considered to be not suitable for direct LDH growth because of phase composition and morphological features. In this paper, we describe a new methodology that consists of covering the PEO coating with a thin layer of aluminum oxide based xerogel as the source of aluminate ions for subsequent in-situ LDH growth. X-ray diffraction (XRD) and scanning electron microscope (SEM) images showed a successful formation of LDHs on the surface. An improvement in terms of active corrosion protection was also demonstrated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET).
keywords
PEO-COATINGS; ALUMINUM; ALLOY; RESISTANCE; MG; PHOSPHATE; AEROGELS; OXIDE; FILM; SILICATE
subject category
Chemistry; Materials Science; Physics
authors
Bouali, AC; Straumal, EA; Serdechnova, M; Wielan, DCF; Starykevich, M; Blawert, C; Hammel, JU; Lermontov, SA; Ferreira, MGS; Zheludkevich, ML
our authors
Maksim Starykevich
Junior Researcher
Maria Serdechnova
Post-doc Fellowship
Mário Guerreiro Silva Ferreira
Retired ProfessorProjects
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
acknowledgements
This work was partially financed by the European project MULTISURF (Marie Sklodowska-Curie, Horizon 2020-RISE, grant agreement No 645676). E.A.S. and S.A.L. would like to acknowledge the financial support of the Russian Foundation for Basic Research (RFBR, grant number 18-29-06014). M.S. and C.B. would like to also thank the ACTICOAT project (Era.Net RUS Plus Call 2017, Project 477) for the financial support.