Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 33, Issue 8, Pages 987-996Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.21577/0103-5053.20220065
Keywords
EIS; corrosion resistance; ion exchanger; carbon steel; aluminum alloy; hydrogel
Categories
Funding
- project PVE-CAPES [88881.064969/2014-01]
- CNPq [306038/2017-0, 303126/2019-1]
- CAPES [001]
- CAPES (PDSE)
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In this study, ALG/Ce3+ hydrogel microparticles are developed as a smart release system for cerium(III) ions, effectively inhibiting the corrosion process of metal substrates. This alginate-based complex is a sustainable solution for corrosion protection.
Alginate (ALG) is a natural polymer used in a wide range of applications. Cerium is a sustainable corrosion inhibitor for many metal substrates. In this study, ALG/Ce3+ hydrogel microparticles are presented as an innovative cerium(III) reservoir system for the smart release of cerium ions. The active corrosion inhibition capacity of the ALG/Ce3+ complex was investigated. Tests using ALG/Ce3+ macrogels (beads) and electrochemical experiments showed that, in saline media, ALG/Ce3+ hydrogel was able to release Ce3+, which was subsequently exchanged with Al3+, Fe2+ and Fe3+ and, thus slowing the corrosion process of AA2024 (aluminum alloy) and AISI1020 (carbon steel) substrates, respectively. It is suggested that the presence of metal ions originated from the corrosion process triggers the cerium release. The corrosion protection of ALG/Ce3+ of the aluminum alloy was confirmed by polarization curves, electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET) and the protection of the carbon steel was demonstrated by EIS experiments. To the best of our knowledge, this is the first time that an alginate-based complex has been reported as an ion exchange corrosion-inhibiting system for metal substrates.
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