Comparison of polyaniline primers prepared with different dopants for corrosion protection of steel

Adhesion of Polyaniline on Metallic Surfaces

“…The advantage of PAni was its effective use in acidic environments. According to different authors (Dominis et al, 2003;Cook et al, 2004), at least three different configurations of PAni used as a corrosion protector have been reported: coatings alone, such as solution cast PAni films formed or electrochemically synthesized (Santos et al, 1998;Huerta-Vilca et al, 2003b, 2004aFahlman et al, 1997), coatings as primer with a conventional polymer topcoat (Dominis et al, 2003;Talo et al, 1997), and PAni blended with a conventional polymer coating or polymer coatings containing PAni as an additive (Galkowski et al, 2005;Samui et al, 2003;Sathiyanarayanan et al, 2009). Kinlen et al (Kinlen et al, 1997) and other authors Oliveira et al, 2009) observed that the electrochemically produced conducting polymers, as PAni, shift the corrosion potential (E corr ) of the metal to the passive region, maintaining a protective oxide layer on the metal and minimizing the rate of metal dissolution (Eq.…”

Interaction of Polyaniline with Surface of Carbon Steel

“…Because of porosity and low mechanical stability of coating prepared with this simplest method, other approaches were elaborated: using of conducting polymer as a primer with conventional top-coat, blending with a conventional polymer coating, and addition of low concentration of conducting polymer to the conventional organic coatings [28]. It was shown that conducting polymer primer in combination with conventional top-coat demonstrates better performance than top-coat alone [29]. At the same time, blending of conducting polymer with conventional resins allows avoiding multilayer coating.…”

Corrosion protection of magnesium alloy ZM21 by polyaniline-blended coatings

“…In recent years, therefore, the use of polymer blended conventional organic coatings has gained momentum. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] It has been established that the conducting polyaniline-blended organic coatings have been found to protect the pinholes due to the passivation ability of the conductive polymer. 12,14,19 However, the use of conducting polymer pigment for the corrosion protection of magnesium alloys is not widely studied.…”