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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effective corrosion protection by eco-friendly self-healing PMMA-cerium oxide coatings

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Harb, Samarah Vargas [1] ; Trentin, Andressa [1] ; Carneiro de Souza, Thiago Augusto [1] ; Magnani, Marina [1] ; Pulcinelli, Sandra Helena [1] ; Santilli, Celso Valentim [1] ; Hammer, Peter [1]
Total Authors: 7
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Web of Science Citations: 4

Metallic alloys are extensively used in many technological applications, however their susceptibility to corrosion causes huge economical losses and can result in failure of critical components. Aiming to obtain environmentally friendly, self-healing and high efficient anticorrosive coatings, organic-inorganic hybrids consisting of poly (methyl methacrylate) (PMMA) covalently bonded to CeO2/Ce2O3 nanoparticles have been synthetized by the sol-gel process. Cerium oxide nanoparticles were covalently conjugated with the coupling agent 2-hydroxyethyl methacrylate (HEMA) and different proportions of methyl methacrylate (MMA), and subsequently the hybrid solutions were used to deposit films on A1020 carbon steel by dip-coating. The coatings are transparent, homogeneous, free of pores, have low surface roughness (< 1.6 nm), and present good thermal stability (> 220 degrees C). Excellent anticorrosive efficiency and durability was obtained by the nanoscale dispersion of cerium oxide nanoparticles into PMMA matrix, achieving for the sample with molar ratio of 1Ce:2HEMA:25MMA an impedance modulus up to 290 GO cm(2), 8 orders of magnitude higher than the bare carbon steel, remaining essentially unchanged during 6 months exposure to saline solution. A detailed analysis of scratched coatings evidenced that Ce ions act as self-healing agents inhibiting the progression of the corrosion process. This work demonstrates that the active corrosion inhibition and environmental compliance make these PMMA-cerium oxide coatings a very promising alternative for the conventional protection systems. (AU)

FAPESP's process: 15/11907-2 - Structure and electrochemical properties of PMMA-silica hybrid coatings modified with cerium and lithium ions.
Grantee:Andressa Trentin
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 15/09342-7 - Development of multifunctional PMMA- (TiO2, ZrO2 and CeO2)hybrids
Grantee:Samarah Vargas Harb
Support Opportunities: Scholarships in Brazil - Doctorate