Polyaniline acrylic coatings for corrosion inhibition: the role played by counter-ions

Silva, José E. Pereira da; Torresi, Susana Inês Córdoba de; Torresi, Roberto Manuel

doi:10.1016/j.corsci.2004.07.014

Cited by 145 publications

(44 citation statements)

References 34 publications

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“…3. These bands appear in polymers with cycled phenazine-type structures [19,21] and the same bands have been observed in ladder polymer such as poly(o-aminophenol) [23], which presents a like-phenoxazine structure. In addition, it have been recently reported that copolymers of aniline and aminonaphthalene-disulfonic acid which have heterocyclic structure (like phenazine) show a Raman band at 1630cm" 1 [24], Therefore it is possible that the structure of PoANIMagH is formed by both open (like-polyaniline) and cyclical (like-poly(o-aminophenol)) units.…”

Section: Resultsmentioning

confidence: 75%

“…[19] is 514.5 nm (in this work A exc = 632.8 nm) and it is known that Raman spectra depend on the laser excitation wavelength [20]. However, Pereira da Silva et al observed two bands at 1317 and 1338 cm" 1 when camphorsulfonic acid-doped PANI was irradiated with a He-Ne laser (A exc =632nm [21]. These bands coalesce at 1336cm" 1 in secondarily doped PANI (with m-cresol) and the authors attributed this broad band at extended polarons [21], In addition, Cochet etal.…”

Section: Resultsmentioning

confidence: 96%

“…However, Pereira da Silva et al observed two bands at 1317 and 1338 cm" 1 when camphorsulfonic acid-doped PANI was irradiated with a He-Ne laser (A exc =632nm [21]. These bands coalesce at 1336cm" 1 in secondarily doped PANI (with m-cresol) and the authors attributed this broad band at extended polarons [21], In addition, Cochet etal. noticed the same behavior for emeraldine salt excited with red laser at A exc = 676.4 nm [22].…”

Section: Resultsmentioning

confidence: 99%

“…Pereira da Silva et al proposed for polyaniline, doped with camphorsulfonic acid, that several bands at 574, 1381 and 1643 cm -1 appeared as the polymer was heated. The authors proposed that the band at 574 cm -1 could be related to the vibrational modes of cyclic structures containing tertiary nitrogen formed by crosslinking [21], Therefore, PoANI-MagH could be formed by both electroactive polymer segments and redox segments. However, it is also possible that the polymer is heated during the Raman experiment due to the high power density in the irradiated region.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Electrochemical behaviour of conducting polymers obtained into clay-catalyst layers. An in situ Raman spectroscopy study

Boutaleb

Benyoucef

Salavagione

et al. 2006

European Polymer Journal

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical behaviour of conducting polymers obtained into clay-catalyst layers. An in situ Raman spectroscopy study

Boutaleb

Benyoucef

Salavagione

et al. 2006

European Polymer Journal

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“…The formation of an electron-blocking, insoluble salt complex of combined H 2 PP and divalent metal cations, is reported to provide high resistance to underfilm corrosion. 9,10 Williams et al demonstrated the effective decrease of cathodic delamination rate by 99% with increasing volume fractions (φ) (i.e. φ ≤ 0.05).…”

mentioning

confidence: 99%

In-Coating Phenyl Phosphonic Acid as an Etch-Primer Corrosion Inhibitor System for Hot Dip Galvanized Steel

Glover

Subramanian

Williams

2015

J. Electrochem. Soc.

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In-coating phenyl phosphonic acid (H 2 PP) additions are investigated as inhibitors of corrosion-driven organic coating disbondment on hot-dip galvanized (HDG) steel surfaces. In-situ scanning Kelvin probe (SKP) experiments under atmospheric corrosion conditions are used to study the influence of the quantity of dissolved H 2 PP in the organic coating on the kinetics of delamination. It is demonstrated that increasing levels of in-coating H 2 PP progressively lengthen the time for organic coating delamination to become established. Once underfilm corrosion becomes initiated, rates of cathodic disbondment are significantly slowed by H 2 PP additions in comparison with the uninhibited case. From the observed delamination kinetics, an inhibition mechanism is proposed whereby H 2 PP additions interact with the underlying zinc to form an interfacial salt layer which blocks underfilm oxygen reduction. The contribution of other possible modes of inhibition, such as H 2 PP release from the coating into the external defect electrolyte and a buffering of underfilm pH, are also discussed. There is significant current interest in replacing conventional corrosion protection technologies, based on an initial pre-treatment and subsequent application of organic-based primer, with a single coating system for metal surfaces. The pre-treatment step typically produces a thin inorganic layer which improves organic coating adhesion to the metal surface and provides a degree of corrosion protection.1-4 Additional corrosion protection is afforded by dispersions of sparingly soluble inorganic salt inhibitor pigments within the organic-based primer, where the constituent ions will leach out and dissolve on water contact with exposed regions of coating.5 Passivation of the metal surface at coating defect regions is achieved by the subsequent build up of an insoluble metallic/salt layer which blocks electron transfer. 6 An alternative to a two-step corrosion protection system is an etch primer, which traditionally comprises a suspension of chromate pigment in a polyvinyl butyral (PVB) alcohol solution, mixed with a phosphoric acid-based activator prior to application.7 A reaction occurs at the point of first contact of the wet coating with the substrate 8 producing an interfacial metal phosphate salt layer, which in combination with the dispersed chromate pigment, provides the required protection against corrosion. However, with current legislative pressure to eliminate Cr(vi)-based inhibitors from protective coating formulations, there is a pressing need to identify effective, yet environmentally acceptable alternatives. In this current study a potential Cr(vi)-free etch primer system, based on phenylphosphonic acid (H 2 PP), which acts as both activator and in-coating inhibitor is investigated. Previous studies have demonstrated the effective inhibition of corrosion (on iron surfaces) by polymeric, H 2 PP-doped polyaniline blends. The formation of an electron-blocking, insoluble salt complex of combined H 2 PP and divalent metal cations,...

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Corrosion and Corrosion Prevention in Water Transportation and Storage Industry

Çiçek¹

2014

Corrosion Engineering

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Polyaniline acrylic coatings for corrosion inhibition: the role played by counter-ions

Cited by 145 publications

References 34 publications

Electrochemical behaviour of conducting polymers obtained into clay-catalyst layers. An in situ Raman spectroscopy study

Electrochemical behaviour of conducting polymers obtained into clay-catalyst layers. An in situ Raman spectroscopy study

In-Coating Phenyl Phosphonic Acid as an Etch-Primer Corrosion Inhibitor System for Hot Dip Galvanized Steel

Corrosion and Corrosion Prevention in Water Transportation and Storage Industry

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