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Anticorrosion properties of smart coating based on polyaniline nanoparticles/epoxy-ester system

Arefinia, R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.porgcoat.2012.06.003
  3. Publisher: 2012
  4. Abstract:
  5. In this study, the anticorrosive effect of dodecylbenzenesulfonicacid-doped polyaniline nanoparticles [n-PANI (DBSA)] as a conductive polymer was investigated using electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) techniques. Initially, the n-PANI (DBSA) were successfully synthesized via inverse microemulsion polymerization leading to the spherical nanoparticles with an average diameter less than 30 nm. Two coating systems including 1 wt% n-PANI(DBSA) blended epoxy ester (n-PANI(DBSA)/EPE) and neat epoxy ester (EPE) were coated on the carbon steal substrate. The anticorrosion performance of the prepared coatings was studied using EIS measurement in 3.5% NaCl solution during 77 days. The experimental data was modeled using Zview software according to the appropriate equivalent circuit model. The results clearly showed the better corrosion protection of the n-PANI(DBSA)/EPE coating compared to the EPE coating. This behavior was attributed to the ability of n-PANI(DBSA) in releasing dopant anion when the corrosion process is initiated on the metal substrate emphasizing the smart protection of n-PANI(DBSA)/EPE coating. Accordingly, the released dopant anions along with the iron cations provide a secondary barrier layer, which passivates the substrate
  6. Keywords:
  7. Smart mechanism ; Surface coating ; 3.5%Nacl ; Anti-corrosion property ; Anti-corrosive ; Anticorrosion performance ; Average diameter ; Barrier layers ; Coating system ; Conductive Polymer ; Corrosion process ; EIS measurements ; Epoxy esters ; Equivalent circuit model ; Experimental data ; Inverse microemulsion polymerization ; Iron cations ; Metal substrate ; Polyaniline nanoparticles ; Smart coatings ; Spherical nanoparticles ; Surface coatings ; Corrosion protection ; Corrosion resistance ; Doping (additives) ; Electrochemical impedance spectroscopy ; Esterification ; Esters ; Microemulsions ; Nanoparticles ; Negative ions ; Photoelectrons ; Polyaniline ; Sodium chloride ; Synthesis (chemical) ; X ray photoelectron spectroscopy ; Coatings
  8. Source: Progress in Organic Coatings ; Volume 75, Issue 4 , 2012 , Pages 502-508 ; 03009440 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0300944012001580