BTA loaded in various CeO2 nanocontainers in epoxy coating for long-term anticorrosion of low carbon steel

https://authors.elsevier.com/a/1fhLa14RJzXsCq （free acess to 20. OCT. 2022）

Highlights

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CeO2 spheres of three structures were used as BTA nanocontainers for anticorrosion.

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CeO2 spheres are hollow (HSs), double-shell hollow (DHSs) or solid-mesoporous (SSs).

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Their surface area and surface state influenced BTA loading on both chem.&phys. way.

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CeO2-HSs had the largest loading amount of 12.5 wt% and the lowest releasing rate.

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CeO2-HSs with BTA in epoxy coating showed no rusting after 40 days of the salt spray.

Abstract

To figure out the behavior of benzotriazole (BTA) loaded in CeO2 nanocontainers during long term anticorrosion, three kinds of CeO2 spheres were used: hollow spheres (HSs), double-shell hollow spheres (DHSs), and solid-mesoporous spheres (SSs). The BTA loading and releasing situations were checked, and CeO2-HSs exhibited the largest BTA loading amount of 12.5 wt%, forming by both chemical and physical adsorption. The highest BTA loading in CeO2-HSs may be attributed to its hollow structure and more Ce3+ sites (39 %) for BTA anchoring. Thus, CeO2-HSs@BTA exhibited an excellent long-term anticorrosion in epoxy coating for low carbon steel protection, showing no rusting after 40 days of salt spray experiment.

Graphical abstract