Journal
PROGRESS IN ORGANIC COATINGS
Volume 45, Issue 4, Pages 415-421Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0300-9440(02)00145-5
Keywords
zinc-rich paint (ZRP); powder coatings; carbon blacks; Raman spectroscopy; electrochemical measurements
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The effect of addition of conductive pigments like carbon blacks on the corrosion behavior of zinc-rich powder paints coated steel in artificial sea water was investigated. Open circuit potential measurements were used to characterize the cathodic protection ability and duration. Micro-Raman spectroscopy analysis was performed in order to identify the corrosion products and to follow the penetration of the solution inside the coatings. Two different effects were pointed out: an increase of the porosity induced by carbon addition and a galvanic action between zinc and carbon pigments. The performance of the powder coatings, strongly improved if the carbon amount is sufficient, was compared to the one reported for solvent-based zinc-rich paints. (C) 2002 Elsevier Science B.V. All rights reserved.
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