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Theoretical and Empirical Investigation on the Anticorrosion Performance of Smart Nano Composite Coating

Arefinia, Reza | 2011

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 43201 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar; Shariatpanahi, Homira; Neshati, Jaber
  7. Abstract:
  8. In the present study, smart anticorrosion coatings were successfully prepared based on epoxy ester (EPE) resin and conductive nano polyaniline particles (nES). Anticorrosion behaviors of these coatings were analyzed by electrochemical techniques. Generally, this thesis consists of two main parts: the theoretical studies (1st and 2nd Chaps.) and empirical investigations (3th to 8th Chaps.).The first Chap. expresses a basic introduction about the corrosion concepts and different types of anticorrosion coating. In the second Chap. main goals and stage works of the thesis about the smart anticorrosion coatings are introduced considering literature researches. The subject of the 3th Chap. is devoted to the synthesis and characterization of nES particles. The obtained results shows a spherical morphology and mean diameter of less than 30and nm for the nES particles.The anufacturing of the coatings was conducted through incorporation of different contents of nES particle into EPE having no side effect on the structure of nES particles. Additionally, the physic-mechanical properties of the manufactured coatings were investigated (4th Chap.).Anticorrosion behaviors of the prepared coatings were studied using electrochemical impedance spectroscopy (EIS). To do this, the measured EIS results were modeled by equivalent circuit models and Zview software. The parameters calculated from modeling clearly indicated active and smart characterization of nES particles. Moreover, the open circuit potential measurement and X-ray photoelectron spectroscopy techniques confirmed the EIS results obtained from EIS analysis on the nES particles (5th Chap.).The chemical structure of nES is very sensitive to pH variation of environment. Therefore, anticorrosion behavior of the coating containing 1wt. % of nES particles was investigated in the environments with different pHs by modeling of EIS measurements (6th Chap.).Anticorrosion resistance of nano composite coatings was higher than other coating systems studied in the literature. However, the barrier property of EPE is lower than epoxy resin. Since, a coating layer of epoxy resin was covered on the coating containing 1 wt. % of nES to manufacture a two layer coating with both high active and barrier properties. Performance of this coating was compared with a single layer coating of neat epoxy having same thickness (7th Chap.)
  9. Keywords:
  10. Polyaniline ; Nanoparticles ; Coverage ; Corrosion ; Modeling ; Electrochemical Impedance Spectroscopy

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