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Galvanic function of zinc-rich coatings facilitated by percolating structure of the carbon nanotubes : Part II: Protection properties and mechanism of the hybrid coatings

Gergely, András and Pászti, Zoltán and Mihály, Judith and Drotár, Eszter and Török, Tamás (2014) Galvanic function of zinc-rich coatings facilitated by percolating structure of the carbon nanotubes : Part II: Protection properties and mechanism of the hybrid coatings. Progress in Organic Coatings, 77 (2). pp. 412-424. ISSN 0300-9440

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Abstract

Innovative zinc-rich hybrid paint coatings were developed using nano-size particles composed of alumina hydrate modified with polystyrene-sulfonate (PSS) doped polypyrrole (PPy) and either purified or functionalized multi-walled carbon nanotubes (MWCNTs). General properties of the particles and their dispersions were characterised in 1st part of the work. Corrosion protection characteristics of the hybrids were examined on low-carbon steel panels by immersion and saltspray chamber tests. Immersion tests were monitored by electrochemical impedance spectroscopy (EIS). Primers were analysed by glow-discharge optical emission spectroscopy (GD OES) and surface of the steel substrates was investigated by X-ray photoelectron (XPS) and FT-Raman spectroscopy. Improved barrier and galvanic function of the hybrids over traditional zinc-rich paints (ZRPs) were evidenced by performance metrics. Optimal protection characteristics were found when content of the particles was close to the statistical and kinetic percolation thresholds. Advanced protection mechanism of the hybrids is discussed on function of the nano-size filler benefiting the utilisation of sacrificial current output of the anodic zinc along with taking into account aspects of the multiple percolation theory. The interpretation given in this work is intended to facilitate design of next generation of corrosion protecting metal-rich coatings.

Item Type: Article
Uncontrolled Keywords: A. Zinc-rich paint, B. EIS, XPS C. Corrosion protection, Percolation
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QD Chemistry / kémia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 13 Jan 2014 14:12
Last Modified: 13 Jan 2014 14:12
URI: http://real.mtak.hu/id/eprint/8638

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