Abstract
In this work, the effect of H3PO4 and HCl dopants on the corrosion protection properties of polyaniline nanoparticles (PANs) dispersed in epoxy novolac, coated on carbon steel was compared using the Scanning Kelvin Probe (SKP). The nanometeric size and uniform dispersion of PANs in the coating were confirmed by scanning and transmission electron microscopy. Conductivity test, Potentiodynamic measurements and SKP technique were used to study theeffect of dopant type on the corrosion behavior of carbon steel in presence of PANs. The results show that PANs-containing nanocomposites can stabilize the potential of steel substrate in a passive state. Furthermore, variation coefficient (VC) of the surface Volta potential differences was introduced as an index for detection of the corrosion uniformity under the coating in presence of PANs. According to SKP results, the protection ability of coatings was improved in presence of PANs. In addition, the steel corrosion under the coating containing HCl-doped PANs tended to be more localized than that under the coating containing H3PO4-doped PANs. This is attributed to aggressive and inhibitive roles of chloride and phosphate anions respectively.
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