Polypyrrole Coating on Zinc for Corrosion Prevention of Zinc-coated Steels

Tsuchiya, Sho; Ueda, Mikito; Ohtsuka, Toshiaki

doi:10.2355/isijinternational.47.151

Cited by 10 publications

(6 citation statements)

References 18 publications

(18 reference statements)

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“…From the semicircle in Figure 10, the equivalent circuit shown in Figure 11 was assumed, which consists of a series connection of a resistance R PPy of the conducting PPy layer with a parallel R ox -C ox circuit for the dielectric interfacial thin oxide layer. We found the same layer structure illustrated in Figure 12 in a previous paper concerning a PPy layer formed on a zinc electrode in a tartrate solution [34].…”

Section: Ac Impedance Under Dry Conditionssupporting

confidence: 63%

“…In a previous study on a PPy coated zinc electrode, we observed by SEM an interfacial oxide/salt layer between the zinc substrate and the PPy layer in a cross-sectional view of the sample [34]. Because the interfacial oxide layer on the 55% Al−Zn alloy was assumed to be much thinner than that found on the zinc electrode, it might be difficult to observe the oxide layer in cross section using SEM.…”

Section: Corrosion Test In a 35 Wt% Nacl Solutionmentioning

confidence: 99%

“…Martins et al prepared a PPy layer on zinc in an aqueous tartrate solution, where a zinc tartrate salt layer acted as a passivation layer on the zinc surface [28,29]. We have also prepared a PPy layer on zinc in an acidic tartrate solution, and we have observed the formation of an oxide and salt layer between the zinc and PPy by cross-sectional analysis using scanning electron microscopy (SEM) [34].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [34], the addition of high concentrations of molybdate to the Py monomer solution prevented the formation of PPy and resulted in the formation of a black salt layer of zinc molybdate. In this study, therefore, we chose the low molybdate concentration of 5.0 mM.…”

Section: Addition Of Molybdate Anions To the Ppy Doped With Tartrate mentioning

confidence: 99%

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Polypyrrole film on 55% Al–Zn-coated steel for corrosion prevention

et al. 2012

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For corrosion protection of 55% Al−Zn-coated steel, a dense polypyrrole (PPy) film is electrochemically formed on 55% Al−Zn-coated steel in an acidic tartrate solution under constant current control. The film potentially consists of an inner layer of aluminium and/ or zinc oxide and an outer PPy layer doped with tartrate anions. The PPy layer can maintain passivation of 55% Al−Zn-coated steel in a 3.5 wt% NaCl aqueous solution and protected the steel for several hours. The doping of molybdate anions into the PPy-tartrate film greatly improved the film's protective properties.

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Section: Ac Impedance Under Dry Conditionssupporting

confidence: 63%

Section: Corrosion Test In a 35 Wt% Nacl Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Addition Of Molybdate Anions To the Ppy Doped With Tartrate mentioning

confidence: 99%

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Polypyrrole film on 55% Al–Zn-coated steel for corrosion prevention

et al. 2012

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“…These species are commonly used as corrosion inhibitors for zinc protection. They also have been incorporated in PPy films to improve these films protection properties on zinc coated steel [48,49]. We found it interesting to study the behavior of such ions within PPy matrix.…”

Section: Reduction Processes Of Ppy/moo 4 2− Filmsmentioning

confidence: 99%

Relation between structure and ions mobility in polypyrrole electrosynthesized under high frequency ultrasound irradiation

Taouil

Lallemand

Hihn

et al. 2011

Electrochimica Acta

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International audienceHigh frequency ultrasound (500 kHz) was shown to have very interesting effects on PPy elaborated with various counter-ions: perchlorate (ClO(4)(-)), p-toluenesulfonate (TS(-)) and molybdate (MoO(4)(2-)). Changes in polymer growth for sonicated films were highlighted by Atomic Force Microscopy (AFM) while Scanning Electron Microscopy (SEM) showed thinner and more homogeneous surface structure for PPy elaborated under ultrasound. Mobility of ions within PPy films was studied by electrochemical techniques, sonicated PPy seems to have much denser and more compact structure than silent one's. Specific electrochemical behavior was evidenced for sonicated PPy/MoO(4)(2-) as well as unique ions reparation within the organic matrix, thanks to Glow Discharge Optical Emission Spectroscopy (GDOES). This technique was used in original manner to study presence and repartition of doping ions in the film. X-Ray Photoelectron Spectroscopy (XPS) analyses showed an increase in doping level for sonicated PPy but electrical conductivity measurements let appear a decrease in conductivity for PPy elaborated under sonication

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