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Localized corrosion behaviour of reinforcement steel in simulated concrete pore solution
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-4431-0671
2009 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 51, no 9, 2130-2138 p.Article in journal (Refereed) Published
Abstract [en]

The correlation of localized corrosion behavior and microstructure of reinforcement steel in simulated concrete pore solutions was investigated. The SEM/EDS analysis showed that most of ferrite, minor amount of pearlite and some MnS inclusions existed on the steel surface. The SKPFM results indicated a higher corrosion tendency at the ferrite grain boundaries, pearlite grains and MnS inclusions. The EIS and electrochemical polarization measurements demonstrated the influence of pH and chloride concentration on the corrosion behavior. in situ optical observations and AFM images revealed a detail of the localized corrosion behavior, which was in good agreement with the results from the other measurements.

Place, publisher, year, edition, pages
2009. Vol. 51, no 9, 2130-2138 p.
Keyword [en]
Steel, AFM, Pitting corrosion
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-33120DOI: 10.1016/j.corsci.2009.05.044ISI: 000269597000030ScopusID: 2-s2.0-68049114482OAI: diva2:413478

QC 20110428

Available from: 2011-04-28 Created: 2011-04-28 Last updated: 2013-09-11Bibliographically approved
In thesis
1. The Mussel Adhesive Protein (Mefp-1): A GREEN Corrosion Inhibitor
Open this publication in new window or tab >>The Mussel Adhesive Protein (Mefp-1): A GREEN Corrosion Inhibitor
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Corrosion of metallic materials is a natural process, and our study shows that even in an alkaline environment severe corrosion may occur on a carbon steel surface. While corrosion cannot be stopped it can be retarded. Many of the traditional anti-corrosion approaches such as the chromate process are effective but hazardous to the environment and human health.

Mefp-1, a protein derived from blue mussel byssus, is well known for its extraordinary adhesion and film forming properties. Moreover, it has been reported that Mefp-1 confers a certain corrosion protection for stainless steel. All these facts indicate that this protein may be developed into corrosion inhibitors with ‘green’, ‘effective’ and ‘smart’ properties.

In this study, a range of surface-sensitive techniques have been used to investigate adsorption kinetics, film forming and film compaction mechanisms of Mefp-1. In situ atomic force microscopy (AFM) enables the protein adsorption on substrates to be visualized, whereas the ex situ AFM facilitates the characterization of micro- and nano-structures of the protein films. In situ Peak Force AFM can be used to determine nano-mechanical properties of the surface layers. The quartz crystal microbalance with dissipation monitoring (QCM-D) was used to reveal the build-up of the Mefp-1 film on substrates and measure the viscoelastic properties of the adsorbed film. Analytical techniques and theoretical calculations were applied to gain insights into the formation and compaction processes such as oxidation and complexation of pre-formed Mefp-1 films. The electron probe micro analyzer (EPMA) and X-ray photoelectron spectroscopy (XPS) were utilized to obtain the chemical composition of the surface layer. Electrochemical impedance spectroscopy (EIS) measurements were performed to evaluate the corrosion inhibition efficiency of different forms of Mefp-1 on carbon steel substrates.

The results demonstrate that Mefp-1 adsorbs on carbon steel surfaces across a broad pH interval, and it forms a continuous film covering the substrate providing a certain extent of corrosion protection. At a higher pH, the adsorption is faster and the formed film is more compact. At neutral pH, results on the iron substrate suggest an initially fast adsorption, with the molecules oriented preferentially parallel to the surface, followed by a structural change within the film leading to molecules extending towards solution. Both oxidation and complexation of the Mefp-1 can lead to the compaction of the protein films. Addition of Fe3+ induces a transition from an extended and soft protein layer to a denser and stiffer one by enhancing the formation of tri-Fe3+/catechol complexes in the surface film, leading to water removal and film compaction. Exposure to a NaIO4 solution results in the cross-linking of Mefp-1, which also results in a significant compaction of the pre-formed protein film. Mefp-1 is an effective corrosion inhibitor for carbon steel when added to an acidic solution, and the inhibition efficiency increases with time. As a film-forming corrosion inhibitor, the pre-formed Mefp-1 film provides a certain level of corrosion protection for short term applications, and the protection efficiency can be significantly enhanced by the film compaction processes.

For the long term applications, a thin film composed of Mefp-1 and ceria nanoparticles was developed. The deposited Mefp-1/ceria composite film contains micro-sized aggregates of Mefp-1/Fe3+ complexes and CeO2 particles. The Mefp-1/ceria film may promote the further oxidation of ferrous oxides, and the corrosion resistance increases with time. Moreover, phosphate ions react with Fe ions released from the surface and form deposits preferentially at the surface defect sites. The deposits incorporate into the Mefp-1/ceria composite film and heal the surface defects, which result in a significantly improved corrosion inhibition effect for the Mefp-1/ceria composite film in both initial and prolonged exposure situations

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 62 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2013:21
carbon steel, mussel adhesive protein, Mefp-1, inhibitor, adsorption, film forming, complexation, cross-linking, ceria nanoparticle, composite film, EIS, AFM, QCM-D, ATR-FTIR, Confocal Raman Micro-spectroscopy, DFT calculation
National Category
Chemical Sciences
urn:nbn:se:kth:diva-123489 (URN)978-91-7501-738-9 (ISBN)
Public defence
2013-06-13, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)

QC 20130610

Available from: 2013-06-10 Created: 2013-06-10 Last updated: 2013-09-11Bibliographically approved

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