1. Encapsulation and incorporation of sodium molybdate in polyurethane coatings and study of its corrosion inhibition on mild steel
- Author
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Alexandros Kakaroglou, Mariangelica Domini, Iris De Graeve, Vrije Universiteit Brussel, Materials and Chemistry, Electrochemical and Surface Engineering, Faculty of Engineering, Architectural Engineering, and In-Situ Electrochemistry combined with nano & micro surface Characterization
- Subjects
Materials science ,Chemistry(all) ,Sodium molybdate ,Inorganic chemistry ,corrosion protection ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Corrosion ,chemistry.chemical_compound ,Corrosion inhibitor ,Materials Chemistry ,Anticorrosion coating ,Polarization (electrochemistry) ,Polyurea ,Corrosion inhibitors ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Interfacial polymerization ,0104 chemical sciences ,Surfaces, Coatings and Films ,Dielectric spectroscopy ,chemistry ,Emulsion ,encapsulation ,0210 nano-technology ,Nuclear chemistry - Abstract
Sodium molybdate is evaluated as corrosion inhibitor for steel in brackish water; it is encapsulated by interfacial polymerization and the produced capsules are characterized. Electrochemical impedance spectroscopy and corrosion potential measurements were used to determine the short-time corrosion inhibition while polarization curves were used for the estimation of the inhibition efficiency. The capsules composition, the Na 2 MoO 4 content and the release rate are then determined. Na 2 MoO 4 shows corrosion inhibition for at least 15 h. Capsules consist of polyurea and polyurethane which are formed due to the reaction of the isocyanates with the water of the emulsion and the used surfactants, respectively. Most of the inhibitor is released within 90 min. Electrochemical Impedance Spectroscopy and Scanning Vibrating Electrode Technique show corrosion inhibition on artificially damaged areas for the coatings containing the corrosion inhibitor capsules.
- Published
- 2016
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