Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
692958 | Progress in Organic Coatings | 2012 | 7 Pages |
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.
► We study the influence of PANI nanoparticles on anticorrosion behavior of EPE. ► Corrosion behavior was investigated carefully by EIS technique. ► We model the corrosion mechanisms using appropriate ECM. ► PANI nanoparticles increases greatly the anticorrosion properties of EPE coating. ► PANI/EPE coating protects the substrate through the smart mechanism.