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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.)

Smart PMMA-cerium oxide anticorrosive coatings: Effect of ceria content on structure and electrochemical properties

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Harb, V, Samarah ; Rodrigues, Mariana S. [1] ; de Souza, Thiago A. C. [1] ; Trentin, Andressa [1] ; Uvida, Mayara C. [1] ; Pochapski, Daniel J. [1] ; Pulcinelli, Sandra H. [1] ; Santilli, V, Celso ; Hammer, Peter [2]
Total Authors: 9
[1] Harb, Samarah, V, Sao Paulo State Univ, Inst Chem, UNESP, BR-14800060 Araraquara, SP - Brazil
[2] Santilli, Celso, V, Harb, Samarah, V, Sao Paulo State Univ, Inst Chem, UNESP, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Progress in Organic Coatings; v. 161, DEC 2021.
Web of Science Citations: 0

Organic-inorganic hybrids are considered an effective and environmentally compliant alternative to chromatebased anticorrosive coatings, currently banned due to the high toxicity of hexavalent chromium. In this work, hybrid nanocomposites based on poly(methyl methacrylate) (PMMA), covalently bonded to cerium oxide nanoparticles through the 2-hydroxyethyl methacrylate (HEMA) coupling agent, were tailored by carefully tuning the inorganic colloidal precursor to provide films with active corrosion protection for metallic substrates. Lithium hydroxide was exploited as oxidizing agent of cerium nitrate to form ceria nanoparticles. Precursor solutions and solid nanocomposites with different LiOH to Ce(NO3)(3)center dot 6H(2)O molar ratios were analyzed using spectroscopic and electron microscopy techniques and theoretical simulations. Electrochemical impedance spectroscopy (EIS) was used to study the anticorrosive performance of the coatings on carbon steel and 7075 aluminum alloy. The results showed that increasing amounts of LiOH lead to the formation of higher ceria content and larger primary nanoparticles, ranging from 1.7 to 2.8 nm. The homogenous similar to 20 mu m-thick coatings present excellent anticorrosive performance on carbon steel and AA7075 substrates. Coatings on carbon steel with low LiOH loading (1Li:1Ce) showed long-term durability and high impedance modulus of up to 29 G Omega cm(2) after 1 day in saline solution. On the AA7075 alloy, the presence of larger cerium oxide particles at higher LiOH content (3Li:1Ce) acted as effective reservoirs of cerium ions, providing high barrier coatings (395 G Omega cm(2)) with active corrosion protection. (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 type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/09342-7 - Development of multifunctional PMMA- (TiO2, ZrO2 and CeO2)hybrids
Grantee:Samarah Vargas Harb
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 19/13871-6 - Development of multifunctional nanocomposites
Grantee:Peter Hammer
Support type: Regular Research Grants