Polipirrollal módosított szén nanocso/ alumínium-oxid monohidrát alapú cinkdús hibrid festékalapozók vizsgálata

Translated title of the contribution: Investigation of polypyrrole modified carbon nanotubes/aluminium-oxid monohydrate containing zinc-rich hybrid paint coatings

András Gergely, Z. Pászti, Orsolya Hakkel, I. Bertóti, J. Mihály, Tamás Török

Research output: Contribution to journalArticle

Abstract

Polyelectrolyte modified multi-walled carbon nanotubes of small and large diameter were used to support polypyrrole besides the majority of the nano-size alumina monohydrate. Mixtures of the isotropic and the highly anisotropic particles indicated different filamentous- like aggregations and various extents of spatial arrangements with alterations in coherency of the networks at submicron-scale. Differences in the distribution and the alignment resulted in either effective 3D interaction, the absence of an infinite structure or a low-density association at micron-scale. All the nano-particles featured high electrochemical reversibility and moderate low charging efficiency. Therefore, these particles are regarded as bifunctional components in the zinc-rich hybrid coatings, electrically conductive and inhibitor type particles at the same time. These auxiliary electrically conductive particles were used in paint coatings at a zinc content of 70 wt.% without percolating structure of the isotropic metallic grains. Relative amount of the nano-sized particles (11 wt.%) in the cross-linked and dried epoxy was aimed to assure at least a long-range interaction of these particles herewith facilitating the active corrosion prevention function of the coatings. Hybrid coatings contained multi-walled carbon nanotubes in relative quantities around the volume fraction of 5×10-3 which is a threshold of the statistical type percolation threshold with the same aspect ratio of the filler phase. Based on the corrosion test results performed with immersion and salt-spray propagations, almost retained passive and a valuably improved active corrosion prevention function of the zinc-rich hybrid paints was evidenced in comparison with the traditional type ZRPs of similar compositions. The hybrid coatings containing the particles of PPy-coated polyelectrolyte modified and low functionalized nanotubes provided firm passive and active corrosion protection to steel substrates. Although galvanic protecting nature of the hybrid coating containing the particles of polypyrrole-modified highly functionalized low diameter nanotubes was noticeable, barrier behavior of the coating in both types of corrosion tests seemed less viable compared to other hybrid compositions. Nevertheless, all hybrid paints during the long-term corrosion tests indicated firm resistivity against deadhesion, delamination and blistering. The efficacy to hinder steel rusting was similar to the traditional type ZRPs. These results can be partially explained by the decreased corrosion rate of the sacrificial zinc, greater efficiency utilization of the anodic currents for cathodic protection and the lower potential drop in the coating/steel interface, which overall lead to slower cohesion and adhesion loss of the binder. Remarkable improvement in the overall corrosion prevention performance, especially in the galvanic effiency, is interpreted by invoking the terms of multiple percolation theory.

Original languageHungarian
Pages (from-to)3-24
Number of pages22
JournalKorrozios Figyelo
Volume53
Issue number1
Publication statusPublished - 2013

Fingerprint

Carbon Nanotubes
Polypyrroles
Aluminum
Paint
Zinc
Carbon nanotubes
Coatings
Corrosion prevention
Steel
Corrosion
Polyelectrolytes
Nanotubes
polypyrrole
Aluminum Oxide
Cathodic protection
Corrosion protection
Corrosion rate
Chemical analysis
Delamination
Binders

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Polipirrollal módosított szén nanocso/ alumínium-oxid monohidrát alapú cinkdús hibrid festékalapozók vizsgálata. / Gergely, András; Pászti, Z.; Hakkel, Orsolya; Bertóti, I.; Mihály, J.; Török, Tamás.

In: Korrozios Figyelo, Vol. 53, No. 1, 2013, p. 3-24.

Research output: Contribution to journalArticle

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