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Performance of primers containing polyphosphate‐based ion‐exchange pigments for the protection of galvanised steel
Author(s) -
Deflorian F.,
Felhosi I.,
Rossi S.,
Fedrizzi L.,
Bonora P.L.
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200209)187:1<87::aid-masy87>3.0.co;2-r
Subject(s) - materials science
Abstract The environment protection is pressing the replacement of chromate based pre‐treatments and anti‐corrosive pigments with environmental compatible coating systems, in particular in the coil industry, and many studies are being connected to this field. A relatively new class of inhibitive pigments is the ion‐exchange pigments. Commercial available ion exchange pigment based on calcium‐exchanged silica gel are applied in wide range of 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 is an electrochemical evaluation of corrosion protection performance of environmental friendly coating systems, whose primer is consisting of polyphosphate and ion‐exchanger based anticorrosive pigments. The results proved that the use of electrochemical techniques like electrochemical impedance spectroscopy is important in order to characterize and understand the corrosion protection mechanism and efficiency of organic coatings containing active pigments, as ion exchange pigments. Moreover it was shown that in the coatings the pigments have a significant inhibitive effect and they act as cathodic inhibitors.