期刊
PROGRESS IN ORGANIC COATINGS
卷 90, 期 -, 页码 425-430出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2015.10.021
关键词
pH sensitive microcapsule; Corrosion; Electrochemical analysis; Self-healing; Cerium nitrate
资金
- JFE Steel Corporation
- Army Research Laboratories [W911NF-11-2-0027]
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 mu m to 18 mu m. Under-film 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. (C) 2015 Elsevier B.V. All rights reserved.
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