Abstract
This article reports the potential of Polypyrrole (PPy) particles as anticorrosive additive on an epoxy water-based paint to increase the corrosion protective property of aluminum-coated panels. AA1200 aluminum panels were painted using the electrophoretic deposition method and the coatings with different concentrations of PPy particles tested. PPy particles were synthetized by oxidative polymerization of pyrrole (Py) with iron (III) chloride hexahydrate (FeCl3.6H2O) in the presence of dodecylbenzenesulfonic acid (DBSA). Electrically conducting PPy particles (6.5 S.cm-1) were obtained with a size average of 154 nm. The as-prepared PPy particles were added into a water-based epoxy paint and AA1200 panels were coated via electrophoretic deposition method. The corrosion protective properties of e-coated AA1200 panels were evaluated by means of electrochemical impedance spectroscopy over prolonged exposure time in neutral non-aerated 0.1 M NaCl electrolyte. In particular, the addition of 0.4 wt. % PPy has improved the coating corrosion protective property with respect to epoxy clearcoat and exhibited the highest value among the studied coatings.
Highlights
Cathodic electrodeposition of paints, known as e-coat or cathodic painting, denotes an application paint method used to coat metals with organic coatings
To advance knowledge on the corrosion inhibition effect of PPy as well as the viability of using PPy as anticorrosive additive for e-coat water-based formulations, this paper presents the potential of PPy particles to be used as anticorrosive additive on an epoxy water-based paint in order to increase the corrosion protective property of aluminumcoated panels
The presence of two-time constants in the e-coat/PPy 0.4% by weight appeared just within 336–672 h of exposure, which suggests an improvement in the corrosion protection of the AA1200 H14 aluminum alloy panel at this PPy load for a prolonged length of time
Summary
Known as e-coat or cathodic painting, denotes an application paint method used to coat metals with organic coatings. Hosseini et al (2011) have formulated “smart” corrosion protective PPy/Epoxy coatings on AA5000 aluminum alloy panels.
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