Corrosion protection using polyanujne coating formulations

The effect of ultrasonic irradiation during electropolymerization of polypyrrole on corrosion prevention of the coated steel

“…In the last decades, conductive polymers (CPs) such as polyaniline, polypyrrole, and their derivatives have been widely investigated as corrosion-resistant coatings [1][2][3][4][5][6][7][8][9].…”

Adhesion of Polyaniline on Metallic Surfaces

“…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. 1).…”

Interaction of Polyaniline with Surface of Carbon Steel

“…Their advantages include high electrical conductivity, low cost, and possibility of reducing environmental pollution [8,9]. Redox and catalytic activity of these materials promote formation of an oxyhydroxide layer on the polymer-metal interface [10][11][12], which passivates the metal surface and prevents it from corrosion; on the other hand, it causes instability of the electrical characteristics of the contact between the polymeric and metal phases [13].…”

“…Currently, the research in the field was mainly focused on the electrochemical investigations of the corrosion processes [14][15][16][17][18], but the oxide layer composition was not determined because of difficulties in applying ex situ experimental techniques [19,20]. For example, X-ray photoelectron spectroscopy (XPS) measurements [9,11,21] are performed in vacuum where dehydration of the passive films takes place. Moreover, structure of the passive films is strongly affected by water content which changes dramatically under the conditions of XPS experiment [22,23].…”