Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 5, Pages 2331-2338Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.09.056
Keywords
zinc-rich paint; polyaniline; passivation; electrochemical impedance spectroscopy; Raman spectroscopy
Categories
Ask authors/readers for more resources
In this work, hydrochloride polyaniline (PANI-CI) powder was incorporated as a conductive pigment into powder zinc-rich primer (ZRP) formulations in order to enhance the electronic conduction paths between zinc particles inside the coating and the steel substrate (i.e. percolation). Coatings were applied onto steel substrates and immersed in a 3% NaCl Solution at ambient temperature. The protective properties and electrochemical behaviour of coatings were investigated by monitoring the free corrosion potential versus time and by using EIS. It was found that corrosion potential remains cathodic and constant for a long time up to 100 days of immersion. From EIS results, it was shown that the coatings exhibit larger impedance values than those observed with liquid or other zinc-rich powder formulations Containing carbon black. From Raman spectroscopy results, it may be proposed that zinc particles in contact with PANI-CI pigments were passivated. Other zinc particles remain still active which ensures the cathodic protection of the Substrate. Moreover, coatings exhibit good barrier properties. (c) 2007 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available