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Corrosion performance of carbon steel in N-doped mesoporous carbon spheres (NMCS)-containing alkaline medium in presence of chloride

Journal Article (2019)
Author(s)

H.G.A. Mahmoud (TU Delft - Else Kooi Laboratory, Zagazig University)

Department
Else Kooi Laboratory
Copyright
© 2019 H.G.A. Mahmoud
DOI related publication
https://doi.org/10.1016/j.mtcomm.2019.100677
More Info
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Publication Year
2019
Language
English
Copyright
© 2019 H.G.A. Mahmoud
Department
Else Kooi Laboratory
Volume number
21
Pages (from-to)
1-17
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Abstract

The electrochemical response of carbon steel in chloride-free or chloride-containing 0.1 M and 0.9 M NaOH, in the presence of 0.016 wt.% NMCS, is the subject of this work. The NMCS exhibited a negative (in 0.1 M NaOH) and positive (in 0.9 M NaOH) zeta-potential. This determined altered steel electrochemical response, improved overall, especially in chloride-containing 0.9 M NaOH. The effect was related to an enhanced Fe3+ contribution in the passive film, when NMCS were present. The improved corrosion resistance was also attributable to a NMCS-triggered competition of OH− vs. Cl− ions in the medium, in other words, NMCS interference to promote passive layer stability.