Electrochemical evaluations of zinc-rich epoxy primers modified with polyaniline and exfoliated polyaniline graphite nanocomposite
- 19 March 2019
- journal article
- research article
- Published by SAGE Publications in Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control
- Vol. 54 (5), 389-401
- https://doi.org/10.1080/1478422x.2019.1599177
Abstract
Polyaniline (Pani) and exfoliated polyaniline graphite (EPaniG) nanocomposites were used to modify the protective properties of an epoxy zinc-rich primer (ZRP). The corrosion resistance properties of primers were evaluated in 3.5% sodium chloride solution for a period of 120 days via electrochemical noise (EN) and electrochemical impedance spectroscopy (EIS). EN data were analysed via Wavelet and Hilbert spectra analysis to evaluate the protection mechanism of different ZRP coatings during immersion. Coating resistance and charge transfer resistance of the primers were evaluated by EIS measurements. Results showed good compatibility between |Z|0.01Hz from EIS measurements and mean noise resistance which results from EN data and these evaluations allowed the examination of coating performances during immersion. Free corrosion potential (Ecorr) measurements and salt spray test revealed that both the cathodic protection and barrier properties of the ZRP primer were improved after addition of EPaniG nanocomposite to the ZRP sample.Keywords
This publication has 31 references indexed in Scilit:
- An investigation of the electrochemical action of the epoxy zinc-rich coatings containing surface modified aluminum nanoparticleApplied Surface Science, 2015
- The improvement of anticorrosion properties of zinc-rich organic coating by incorporating surface-modified zinc particleProgress in Organic Coatings, 2012
- Electrochemical impedance spectroscopy investigations of epoxy zinc rich coatings: Role of Zn content on corrosion protection mechanismElectrochimica Acta, 2010
- Electrochemical and anticorrosion performances of zinc-rich and polyaniline powder coatingsElectrochimica Acta, 2008
- EIS characterisation of new zinc-rich powder coatingsProgress in Organic Coatings, 2007
- Organic CoatingsPublished by Wiley ,2006
- Zinc-rich primers—Test performance and electrochemical propertiesProgress in Organic Coatings, 2005
- Zinc-rich powder coatings corrosion in sea water: influence of conductive pigmentsProgress in Organic Coatings, 2002
- Electrochemical behaviour of zinc-rich epoxy paints in 3% NaCl solutionElectrochimica Acta, 1996
- An electrochemical study of zinc-containing epoxy coatings on mild steelCorrosion Science, 1993