Construction of rGO/Fe3O4/PANI nanocomposites and its corrosion resistance mechanism in waterborne acrylate-amino coating

•The resulting rGO-Fe3O4-PANInanocomposites have better dispersibility in the waterborne coating than one of the single components, which will lead to excellent physical barrier performance.•In rGO-Fe3O4-PANInanocomposites, there are π–π electron interactions formed between rGO and PANI, which helps...

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Bibliographic Details
Published inProgress in organic coatings Vol. 133; pp. 117 - 124
Main Authors Zhu, Aiping, Shi, Pingping, Sun, Shasha, Rui, Min
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.08.2019
Elsevier BV
Subjects
Aniline
Barriers
Catalysis
Chemical reduction
Corrosion mechanisms
Corrosion prevention
Corrosion resistance
Corrosion resistance mechanism
Iron oxides
Nanocomposites
P-n junctions
Protective coatings
Reagents
rGO/Fe3O4/PANII
Waterborne coating
rGO/Fe3O4/PANII
Waterborne coating
Corrosion resistance mechanism
Nanocomposites
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Summary:•The resulting rGO-Fe3O4-PANInanocomposites have better dispersibility in the waterborne coating than one of the single components, which will lead to excellent physical barrier performance.•In rGO-Fe3O4-PANInanocomposites, there are π–π electron interactions formed between rGO and PANI, which helps to expand the redox activity of PANI to neutral medium and improve the metal passivation effect.•Moreover, the unique p–n junction between Fe3O4 and PANI in the rGO-Fe3O4-PANI nanocompositespermits electron transport only in one direction and limits the reduction of oxygen, thus effectively improve the anticorrosion performance. In the present work, we report a new method to prepare rGO-Fe3O4-PANI ternary nanocomposites through simultaneous in-situ reduction of stabilized Fe3O4nanoparticles on the GO nanosheets with aniline monomers but without using any secondary reducing reagent, and then in-situ polymerize the aniline on the rGO/Fe3O4 surface. The rGO/Fe3O4/PANI could effectively improve the waterborne acrylate-amino coatings’ anticorrosion performances due to the efficient physical barrier formed between the different components: the enhanced passivation catalysis of PANI in rGO/Fe3O4/PANI nanocomposites and the p–n junction established between the PANI and Fe3O4 interface.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2019.04.011