Self-healing ability and particle size effect of encapsulated cerium nitrate into pH sensitive microcapsules
| Autor: | Kiran B. Kashi, Abhijit J. Suryawanshi, Mark B. Jensen, Victoria J. Gelling, Takeshi Matsuda, Niteen Jadhav |
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| Rok vydání: | 2016 |
| Předmět: |
Cerium oxide
Materials science General Chemical Engineering Organic Chemistry Inorganic chemistry Oxide Emulsion polymerization 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Corrosion Cerium nitrate chemistry.chemical_compound Corrosion inhibitor Coating chemistry Chemical engineering Materials Chemistry engineering Particle size 0210 nano-technology |
| Zdroj: | Progress in Organic Coatings. 90:425-430 |
| ISSN: | 0300-9440 |
| DOI: | 10.1016/j.porgcoat.2015.10.021 |
| Popis: | The effect of the particle size of pH sensitive microcapsules (pH-MC) containing corrosion inhibitors on corrosion protection was investigated. Cerium nitrate as a corrosion inhibitor was encapsulated in pH-MC by water-in-oil emulsion polymerization. By adjusting the agitation speed of the emulsion, the particle size of cerium nitrate containing pH-MC (Ce-MC) was controlled in the range of 7 μm to 18 μm. Underfilm corrosion on steel substrate was improved by adding Ce-MC into the coating matrix; particularly, smaller particle size microcapsules displayed better corrosion inhibition properties. Potentiodynamic polarization scans (PDS) indicated that the suppression of the anodic reaction may be the reason for underfilm corrosion protection. A uniform oxide layer consisting of globular cerium oxide was observed on the steel substrate upon immersion in electrolyte containing cerium nitrate or Ce-MC; these distinctive corrosion products may further enhance the corrosion resistance of coatings containing Ce-MC. This mechanism was supported by electrochemical impedance spectroscopy (EIS) measurements because the charge transfer resistance of coating containing Ce-MC increased with exposure to the electrolyte. |
| Databáze: | OpenAIRE |
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