Inhibitor loaded calcium carbonate microparticles for corrosion protection of epoxy-coated carbon steel
| Author | Raj R. |
| Author | Morozov Y. |
| Author | Calado L.M. |
| Author | Taryba M.G. |
| Author | Kahraman R. |
| Author | Shakoor A. |
| Author | Montemor M.F. |
| Available date | 2020-04-15T12:01:40Z |
| Publication Date | 2019 |
| Publication Name | Electrochimica Acta |
| Resource | Scopus |
| ISSN | 134686 |
| Abstract | pH-sensitive calcium carbonate microparticles were loaded with polyethyleneimine (PEI), a corrosion inhibitor, and used as anti-corrosion additive in epoxy coatings applied on carbon steel. The presence of PEI in the CaCO3 particles was confirmed by Fourier-Transform Infra-Red Spectroscopy (FTIR) and the loading was quantified by Thermal Gravimetric Analysis (TGA). The protective performance of the modified coatings applied on carbon steel was investigated by Electrochemical Impedance Spectroscopy (EIS) and the results evidenced that the modified coatings provided high corrosion protection and very stable barrier properties over time. The self-healing ability was investigated by Localized Electrochemical Impedance Spectroscopy (LEIS) and by the Scanning Vibrating Electrode Technique (SVET) on coated samples artificially damaged and immersed in NaCl solutions. The results revealed an important corrosion inhibition effect, stable over time, in the coatings modified with the PEI loaded particles. The corrosion inhibition effect involves the dissolution of the calcium carbonate microparticles in the local acid media formed at the anodic sites and subsequent release of the corrosion inhibitor that forms a protective film on the steel surface. - 2019 Elsevier Ltd |
| Sponsor | This publication was made possible by NPRP Grant NPRP-9-080-2-039 from Qatar National Research Fund (a member of the Qatar Foundation). L. M. Calado acknowledges Fundação para a Ciência e Tecnologia ( FCT ) for Ph.D. grant SFRH/BD/127341/2016 . Authors from Portugal acknowledge FCT for the additional funding under the projects UID/QUI/00100/2013 and UID/QUI/00100/2019 ; Sherwin-Williams for providing the coating formulations; Voestalpine AG for providing carbon steel; Dr. Marta Alves (Instituto Superior Técnico) for conducting the XRD tests; Dr. Sónia Eugénio (Universidade Atlântica) and Mário Vale (Instituto Superior Técnico) for performing FTIR and TG/DTG studies; Dr. Nick Laycock and Dr. Abitha Ramesh (Qatar Shell Research and Technology Centre) for the helpful technical guidance. Statements made herein are solely the responsibility of the authors. |
| Language | en |
| Publisher | Elsevier Ltd |
| Subject | Calcium carbonate Carbon steel Corrosion protection Functional coating PEI Self-healing |
| Type | Article |
| Pagination | 801-812 |
| Volume Number | 319 |
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