Electrochemical impedance study of environmentally friendly pigments in organic coatings

F. Deflorian, I. Felhosi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The replacement of chromate-based pretreatments and anticorrosive pigments with environmentally compatible coating systems, particularly in the coil industry, is necessary, and many studies are being devoted to this effort. A relatively new class of inhibitive pigments is the ion-exchange pigments. Commercially available ion-exchange pigments based on calcium-exchanged silica gel are applied in coatings technology. The inhibition mechanism is related to the ion-exchange reaction and the deposition of a protective layer, but the mechanism is not yet completely known. The aim of the present study was an electrochemical evaluation of corrosion protection performance of environmentally friendly coating systems, whose primer consists of polyphosphate and ion-exchanger-based anticorrosive pigments. The results proved that electrochemical techniques, like electrochemical impedance spectroscopy (EIS), are useful to characterize and understand the corrosion protection mechanism and efficiency of organic coatings containing active pigments, as ion-exchange pigments, because the protection mechanism is based on an electrochemical action. Moreover, it was shown that in the coatings the pigments have a significant inhibitive effect and they act as cathodic inhibitors.

Original languageEnglish
Pages (from-to)112-120
Number of pages9
JournalCorrosion
Volume59
Issue number2
DOIs
Publication statusPublished - Feb 2003

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Keywords

  • Impedance
  • Inorganic inhibitors
  • Organic coatings

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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