Abstract
An epoxy zinc-rich composite coating containing self-doped conducting sulfonated polyaniline (SPANi) nanofiber was prepared and the corrosion resistance of as-prepared coatings on Q235 substrate studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Results suggested that a zinc-rich coating with addition of 1.0 wt% SPANi could enhance the cathodic protection time and barrier performance. To study corrosion diffusion, artificial scratch and adhesion strength were investigated via the salt spray test and pull-off test, respectively. Finally, the passivating action of coatings was demonstrated by analyses of corrosion products via X-ray diffraction spectroscopy.
Highlights
Metal corrosion is a pressing issue facing many industries and can cause economic losses
To improve the solubility of PANi and enhance the cathodic protection efficiency of zinc-based organic coatings, we introduced a good-solubility conducting nano ller into the 30% zinc-rich coating
These results showed that the addition of 1.0 wt% sulfonated polyaniline (SPANi) to the coatings could promote formation of a passivation layer and enhance the corrosion efficiency of the zinc-rich coating
Summary
Polyaniline (PANi) and PANi derivatives, as a class of conducting polymers, are usually used in corrosion protection.[23,24] In view of its advantages of simple synthesis, good electrochemical activity and chemical stability, it is generally believed that PANi-based coatings can provide excellent corrosion protection by inhibiting the penetration of corrosion medium, and form passive oxide lms on the metal surface.[25,26] pure PANi nano llers o en have problems such as poor solubility and poor interfacial adhesion, which greatly affect the corrosion resistance of coatings To address this issue, several strategies have been adopted in recent years, including the incorporation of soluble functional groups into the side chain,[27,28,29,30] the selection of appropriate dopants[31,32,33,34,35] and composite preparation with other well-dispersed nanoparticles.[36,37,38,39]. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectroscopy were used for investigation of the nal corrosion product, and the corrosion mechanism of the coating with SPANi nano ber was postulated
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