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Novel zinc-rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel Part II: Corrosion prevention behaviour of the hybrid paint coatings

Gergely, András and Pászti, Zoltán and Bertóti, Imre and Török, Tamás (2013) Novel zinc-rich epoxy paint coatings with hydrated alumina and carbon nanotubes supported polypyrrole for corrosion protection of low carbon steel Part II: Corrosion prevention behaviour of the hybrid paint coatings. Materials and Corrosion / Werkstoffe und Korrosion, 64 (5). ISSN 0947-5117

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Abstract

Utilisation of various types of multi-walled carbon nanotubes (MWCNTs) in zinc-rich paints (ZRPs) is presented addressing percolation and porosity related phenomena of traditional ZRPs. Hybrid paint coatings were formulated with 3.21 wt.% polypyrrole (PPy) deposited alumina-MWCNT inhibitor particles (PDAMIPs) and 70 wt.% zinc contents. Corrosion protection behaviour of the hybrid coatings was investigated by electrochemical impedance spectroscopy (EIS), glow-discharge optical emission spectroscopy (GD OES), X-ray photoelectron spectroscopy (XPS) and FT-Raman spectroscopy. Immersion and salt-spray chamber tests gave evidence of improved galvanic protection and barrier nature of the hybrid coatings over the conventional ZRPs, whereas inhibited zinc corrosion and ignorable steel corrosion underwent besides lower degradation of the binder. Zinc-rich hybrid paints with either high relative amount of polyelectrolyte-modified or low proportion of functionalised MWCNTs afforded enhanced corrosion prevention. This result is partly attributed to the nanotube volume fractions around the threshold of infinite cluster formation contributing to electrical percolation and galvanic action of the hybrids. Experimental results are discussed in a broader context on the basis of structure related findings of the PDAMIPs (described in part one) and in the light of recent literature data. From the newly developed inhibitor particles, some of them are respected as worthy additives for application in hybrid coatings featuring high performance corrosion prevention functionality.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QD Chemistry / kémia
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
Q Science / természettudomány > QD Chemistry / kémia > QD03 Inorganic chemistry / szervetlen kémia
Depositing User: Dr. xAranka xPilbáth
Date Deposited: 07 Jun 2013 08:54
Last Modified: 07 Jun 2013 08:54
URI: http://real.mtak.hu/id/eprint/5510

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