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Study of Electrochemical Behavior in the Water-based Epoxy Coating with Nano-size Cerium Oxide

Author: XieXiuWei
Tutor: SongYiQuan
School: Inner Mongolia University of Science and Technology
Course: Materials Science
Keywords: Nano-composite coatings Nanometer CeO2 Dispersant Electrochemical
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 169
Quote: 1
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Abstract


Nanomaterials because of its unique nano-effect, to add to the environmentally friendly water-based dispersion of modified epoxy resin coatings can be given for excellent performance coatings. How to make nanomaterials truly nanoscale dispersed in an aqueous paint, play its nano-effect, high performance, stability, good water-based nano-coating has a very important value. This paper studied the nano-CeO2 in an aqueous medium dispersion. Selected dispersant hexametaphosphate, fatty alcohol ethoxylates and sodium dodecyl sulfate in aqueous medium settling tests and identified in 50g water dispersion effect of nano-CeO2 best dispersant sodium hexametaphosphate, optimum amount of 0.3g. Second, the preparation of high performance epoxy resin binder. The aqueous epoxy resin and different ratios of amine curing agent mixture curing reaction of the resulting cured epoxy paint to soak test, low temperature Damp heat test, corrosion potential measurements, AC impedance spectroscopy measurements to determine the best ratio waterborne epoxy resin emulsion as a mass ratio of 1:1.1 and amine curing agent curing reaction. Finally, after the performance of the most excellent dispersion of nano-CeO2 dispersed slurry was added to the best ratio of epoxy resin base material made of high-speed mixing, made of epoxy resin nano-composite coatings and the coating formed coatings for a variety of performance tests. Performance test results showed that: the role of dispersant added cerium oxide nanoparticles in aqueous epoxy coating acid, alkali, salt, low temperature constant heat performance with outstanding performance. Since the corrosion potential in the testing process, with no added nano cerium oxide compared to aqueous epoxy coating, nano cerium oxide during immersion waterborne epoxy coating has a high corrosion potential. In the AC impedance testing, nano cerium oxide epoxy resin coating impedance spectroscopy in the early immersion is essentially a single capacitive loop appears only one time constant, the impedance formed by coating a larger, indicating that the coating layer may be used as a shielding layer can be effectively isolated corrosive medium in direct contact with the substrate, so that the base metal from corrosion. Composite layer corrosion protection with nano cerium oxide content increases. In summary, in a suitable dispersing agent to act as an enhancer the cerium oxide added to the aqueous epoxy coatings, epoxy modified water played a role.

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