Polypyrrole and polypyrrole–tungstate electropolymerization coatings on carbon steel and evaluating their corrosion protection performance via electrochemical impedance spectroscopy

Sabouri, M.; Shahrabi, T.; Faridi, H.R.; Hosseini, Mir Ghasem

doi:10.1016/j.porgcoat.2008.08.003

Cited by 47 publications

(23 citation statements)

References 27 publications

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“…The dopant (tungstate or vanadate) may combine with aluminum cations forming impervious layer of oxide leading to passivation. 49 As observed in Fig. 21, the corrosion current was also less in the case of CPCCW0.1 coating, CPCCW0.01, and CPCCV0.01 than that of as-received Al flake coating.…”

Section: Potentiodynamic Scanssupporting

confidence: 51%

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Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

2015

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Polypyrrole (PPy) doped with either tungstate or vanadate as counter anions was synthesized by chemical oxidative polymerization on the surface of aluminum (Al) flakes. This resulted in the deposition of PPy on the surface of the Al flakes leading to the formation of doped PPy/Al flake composite pigments. These composite pigments were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, conductive-atomic force microscopy, four-point probe conductivity, and X-ray photoelectron spectroscopy. Furthermore, these composites were incorporated in an epoxy-amide binder system in order to formulate a primer for an aluminum 2024-T3 substrate. The coatings were exposed to the Prohesion test conditions and corrosion resistance properties were monitored by electrochemical impedance spectroscopy, DC polarization, galvanic coupling, and scanning electrochemical microscopy measurements. It was found that the doped PPy/Al flake coatings provided sacrificial protection to the underlying aluminum 2024-T3 substrate. Additionally, the release of dopants from PPy backbone resulted in the passivation in the defect areas improving the corrosion protection ability.

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Section: Potentiodynamic Scanssupporting

confidence: 51%

“…49 The results indicated that the tungstate anion participated in stable oxide layer formation resulting in improvement in corrosion resistance of carbon steel. The tungstate anion participated in a passivation process thereby forming primary passive layer.…”

Section: Introductionmentioning

confidence: 94%

Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

2015

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“…Besides these, some PPy-based composites such as PPy-CMC (carboximethylcellulose), PPy-SDS (sodium dodecylsulfate), PPy-TiNT (Titanate nanotube) and PPy-zinc phosphate were observed to protect steel (Herrasti & Ocoan, 2001), 1Cr18Ni9Ti stainless steel (Zhang &Zeng, 2005), stainless steel type 904L (Herrasti et al, 2011), and AISI 1010 steel (Lenz et al, 2007) surfaces effectively from corrosion, respectively. Electrochemically prepared PPy-WO 4 2- (Sabouri et al, 2009), PPy/PANI (Panah & Danaee, 2010) and Pt/PPy (Rahman, 2011) composite films provided noticeable corrosion inhibition for carbon steel, whereas PPy-TiO 2 (Lenz et al, 2003) (Kowalski et al, 2008), and PPy-PANAP (poly(5-amino-1-naphthol)) (Bereket & Hur, 2009) provided better protection for corrosion of mild steel. PPy-based coatings were also found to reduce the corrosion of oxidizable metals such as Fe (Bazzaoui et al, 2006;Bazzaoui et al, 2005;Lee et al, 2005), Al (Bazzaoui et al, 2005;Lehr & Saidman, 2006a;2006b)and Al alloys (Lehr & Saidman, 2006a;2006b).…”

Section: Corrosion Protection Coatingsmentioning

confidence: 99%

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

Singh¹,

Madhu²,

Awasthi³

2011

Electropolymerization

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“…Table 1 shows that the presence of ions both in low and high temperature accelerates the reduction of coating resistance. According to Z view at very low frequencies, Z 0 , approaches W s À R and Z 00 goes to 0, W s À T ¼ L 2 /D eff (L is effective diffusion thickness and D is the effective diffusion coefficient), 0 < W s À P < 1 [42]. …”

Section: Breakpoint Frequency Measurementmentioning

confidence: 99%

Experimental evaluation of high solid polyurethane coating in the presence of salt at high temperature

Rezaei

Sharif

Sarabi

et al. 2010

Materials & Corrosion

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Ions' presence and high temperature affect the performance and service life of all types of coatings including pipeline coatings. Pipeline coatings are relatively thick and their evaluations are very time consuming. In this study, experiments on the thick coating samples (roughly 250 and 400 mm) of high solid polyurethane (HSPU) have been conducted to evaluate the effect of high temperature and presence of ions in the media, on the performance of coatings. The experiments were performed in two types of electrolytes, sodium chloride solution (3.5 wt% fraction) and distilled water, at two temperature levels of 25 and 75 8C, respectively. The coating performance was studied using electrochemical spectroscopy impedance (EIS) method. The results of experiments show that the presence of ions reduces the service life of the coating and higher temperature accelerates the degradation process further if oxygen is not limited.

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Polypyrrole and polypyrrole–tungstate electropolymerization coatings on carbon steel and evaluating their corrosion protection performance via electrochemical impedance spectroscopy

Cited by 47 publications

References 27 publications

Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

Polypyrrole Composites: Electrochemical Synthesis, Characterizations and Applications

Experimental evaluation of high solid polyurethane coating in the presence of salt at high temperature

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