Characterization of inhibitor storage and release from commercial primers

Pitichon Klomjit, R. G. Buchheit

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Commercial primers are applied on aluminum alloys that are used in aerospace applications to prevent corrosion attack from aggressive environments. These primers contain inhibitors that help combat corrosion. During field operations, these primers store and release inhibitors to protect the underlying alloy. The goal of this study is to characterize storage and release behaviors of these commercial primers to better understand the rate and mechanism by which inhibitors are released. Three commercial primers were investigated in this study; 1) Akzo Nobel 10P20-13 High Solid Primer that contains strontium chromate (SrCrO4), 2) Deft 02GN084 (Pr-based), and 3) Hentzen 16708TEP (BaSO4-based). The primers were coated on a Teflon tape, then stripped off and broken to small pieces. Pieces of the primer coating were immersed into solutions of different Cl concentration, temperature, time, and pH. The solutions were then filtered and characterized by inductively coupled plasma mass spectroscopy (ICP-MS) to analyze the solution chemistry. Results showed that SrCrO4 primer release behavior follows power law kinetics. Solubility limits played an important role in dictating the release kinetics of the chromate primer when accumulation of Cr ion occurs.The effect of pH and temperature can alter this solubility limit. Chloride seems to promote release of chromate because of greater ionic strength. The Pr-rich primer released a large amount of Ca2+ upon exposure and release kinetics were not time-dependent thereafter. The Ba-rich primer did not release soluble constituents to any significant extent.

Original languageEnglish
Pages (from-to)68-77
Number of pages10
JournalProgress in Organic Coatings
Volume114
DOIs
StatePublished - Jan 2018

Bibliographical note

Funding Information:
This material is based on research sponsored by the U.S. Air Force Academy under agreement number FA7000-10-2-0012 and financial support is gratefully acknowledged. The contents of this presentation do not necessarily reflect the position or policy of the U.S. Government and no official endorsement should be inferred.

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Chromate release
  • Commercial primer
  • Corrosion inhibitors
  • Storage corrosion inhibitors

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry

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