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

The ultrasonic electropolymerization of an 5-[o-(4-bromine amyloxy)phenyl]-10,15,20-triphenylporphrin (o-BrPETPP) film electrode and its electrocatalytic properties to dopamine oxidation in aqueous solution

“…Considering the absence of metal ions in this porphyrin and the fact that a broad potential region is needed to actualize the polymerization, ultrasonic irradiation is applied during the electropolymerization process to form a compact functional film with high reactivity on the surface of the carbon substrate. In previous studies [15][16][17], it was reported that the application of ultrasound in a liquid medium allowed the generation of cavitation bubbles, which grow and collapse, greatly changing the pressure and temperature inside the bubbles. Thus, it appears the reactions take place inside bubbles.…”

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5-[o-(4-Bromine amyloxy)phenyl]- 10,15, was electropolymerized on a glassy carbon electrode (GCE), and the electrocatalytic properties of the prepared film electrode response to dopamine (DA) oxidation were investigated. A stable o-BrPETPP film was formed on the GCE under ultrasonic irradiation through a potentiodynamic process in 0.1 M H 2 SO 4 between −1.1 V and 2.2 V versus a saturated calomel electrode (SCE) at a scan rate of 0.1 V s −1 .

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Corrosion of conductive polypyrrole: Galvanic interactions between polypyrrole and metal substrates

“…With regard to practical applications, PPy has been successfully applied in supercapacitors [2,6], batteries [7], sensors [8,9], electrocatalytic conversions [10,11] and protective coatings for metals [12][13][14][15][16], where PPy often has to be electrically connected with substrate metals. As a kind of structural electronic conductive polymers, PPy has a large surface conjugated molecular structure and conducts through the activation of conjugated electrons.…”

Recent Approaches for Designing Nanomaterials-Based Coatings for Corrosion Protection

“…Kowalski et al investigated bilayered polypyrrole coating composed of molybdate-doped internal layer and dodecyl sulfate-doped external layer [120]. The immobile and bulky counter anion (dodecyl sulfate) prevents the penetration of small aggressive anions through anion exchange reaction, whereas the internal layer provides the self-healing functionality through the controlled release of the molybdate anions.…”