Advancement in zinc rich epoxy primers for corrosion protection

Claus Erik Weinell, Soeren Nyborg Rasmussen

Research output: Contribution to conferencePaperResearchpeer-review


The protecting mechanism of zinc rich coatings is mainly based on cathodic protection provided by the zinc dust in the paint. Cathode protection by zinc is finite; however, since after the zinc has been corroding for some time the electrical conductivity diminishes and at the same time zinc corrosion products build up on the zinc dust pigments and polarizes the zinc. The zinc primer still protects the steel substrate but the galvanic activity is taken over by post-cathodic protection which is based on barrier and inhibitive protection provided by the zinc corrosion products, also named "post-cathodic protection". Improvement of the protecting mechanism can be obtained by formulation with auxiliary pigments combining the effects from size distribution and packing, pigment oil absorption, cathodic inhibition etc. A preliminary test result is given in this paper.
Original languageEnglish
Publication date2007
Number of pages630,643
Publication statusPublished - 2007
Externally publishedYes
EventNACExpo 2007 Conference - Nashville, TN, USA
Duration: 1 Jan 2007 → …


ConferenceNACExpo 2007 Conference
CityNashville, TN, USA
Period01/01/2007 → …

Bibliographical note

© 2007 by NACE International.


  • Active pigments
  • ISO 20340
  • NORSOK M-501
  • Zinc epoxy


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