resumo
The search for new alternatives to replace chromate-based coatings is a matter of great importance. Since their official ban due to the raised concerns of hexavalent chromium to the human health and the environment, significant efforts have been devoted to finding a more suitable alternative for the corrosion protection of aluminum alloys. However, the task has been quite challenging since the potential replacement needs to fulfill several requirements both in terms of cost and exceptional corrosion performance. Layered double hydroxides (LDHs) have generated a lot of interest in the past few years. They have been proposed as prospective candidates to replace chromate based protective systems. The particular structure of LDH nanocontainers allows them to intercalate a number of corrosion inhibitors and release them on demand under the action of corrosion relevant triggers. Moreover, their flexible use as pigments in paints or as a pre-treatment directly as conversion layers makes their implementation even more convenient. This review presents a critical view to the studies performed till today on LDHs for corrosion protection of aluminum alloys. (C) 2020 The Author(s). Published by Elsevier Ltd.
palavras-chave
SOL-GEL COATINGS; CHEMICAL CONVERSION COATINGS; MG-RICH PRIMER; MESOPOROUS SILICA NANOCONTAINERS; MICROWAVE-ASSISTED SYNTHESIS; HYDROTALCITE-LIKE COMPOUNDS; SOLVOTHERMAL ION-EXCHANGE; ORGANIC-COATED AA2024-T3; ZINC PHOSPHATE COATINGS; ANION-EXCHANGE
categoria
Materials Science
autores
Bouali, AC; Serdechnova, M; Blawert, C; Tedim, J; Ferreira, MGS; Zheludkevich, ML
Grupos
Projectos
PROAIR - Active PROtection of multi-material assemblies for AIRcrafts (PROAIR)
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
Development and design of novel multiFUNctional PEO COATings (FUNCOAT)
agradecimentos
This work was the result of the participation of several projects namely the European FP7 project PROAIR (PIAPP-GA-2013-612415), the European project MULTISURF and FUNCOAT in frame of the H2020-MSCA-RISE, grant agreement No 645676 and No 823942, respectively.; M.S. and M.L.Z. are also thankful to I2B fond for financial support of this work in frame of MUFfin project as well as the ACTICOAT project (Era.Net RUS Plus Call 2017, Project 477).; This work was also financed by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of Operational Competitiveness and Internationalization Programme (POCI), in the scope of the project MAGICOAT POCI-01-0145-FEDER-016597/PTDC/CTM-BIO/2170/2014 and in the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), and co-financed by national funds through the FCT/MEC.