The use of ion exchange compounds as corrosion inhibiting and sensing pigments in organic coatings

S. Chrisanti, S. Mahajanam, R. G. Buchheit

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

In this paper, selected results illustrating the utility of ion exchange compounds as corrosion inhibiting pigments in organic coatings are presented. Ce-exchanged bentonites released Ce 3+, a cathodic inhibitor, while decavanadate-bearing hydrotalcites released vanadates, anodic and cathodic inhibitors, and Zn 2+, also a cathodic inhibitor. Bentonite and hydrotalicte compounds were added to neat epoxy resins and applied to aluminum alloy 2024-T3 substrates separately to make rudimentary protective coatings. Strontium chromate pigmented coatings were tested for comparison. Results from exposure and electrochemical testing showed that corrosion resistance due to inhibitors leached from the pigments was conferred. Based on pigment type, corrosion resistance decreased in the order SrCrO 4 > hydrotalcite > bentonite. Changes in the crystal structure that occurred upon inhbitor release were characterized by x-ray diffraction of the coatings. The changes in the diffraction patterns were regular and suggested a means of sensing inhibitor exhaustion, which leads to an indication of when the coating rehabilitation might be needed.

Original languageEnglish
Title of host publicationSurface Engineering - Proceedings of the 3rd International Surface Engineering Congress
EditorsN.B. Dahotre, O.O. Popoola
Pages1-7
Number of pages7
StatePublished - 2004
EventSurface Engineering - Proceedings of the 3rd International Surface Engineering Congress - Orlando, FL, United States
Duration: Aug 2 2004Aug 4 2004

Publication series

NameSurface Engineering - Proceedings of the 3rd International Surface Engineering Conference

Conference

ConferenceSurface Engineering - Proceedings of the 3rd International Surface Engineering Congress
Country/TerritoryUnited States
CityOrlando, FL
Period8/2/048/4/04

ASJC Scopus subject areas

  • General Engineering

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