File(s) under permanent embargo
Leaching behavior and corrosion Inhibition of a rare earth carboxylate incorporated epoxy coating system
journal contribution
posted on 2019-01-01, 00:00 authored by Y Peng, A E Hughes, J I Mardel, G B Deacon, P C Junk, Maria ForsythMaria Forsyth, Bruce HintonBruce Hinton, Anthony SomersAnthony Somers© 2019 American Chemical Society. While paint coatings act as important barriers to corrosion, defects can lead to localized, rapid metal loss. The addition of corrosion inhibitors that are capable of leaching from a coating to protect the metal surface at a defect can prevent this type of corrosion. This work investigates the release and corrosion protection capabilities of two rare earth (RE) carboxylate inhibitors from an epoxy coating as an initial step to understanding their leaching behavior and interaction with the coating system. Leaching experiments were performed via inductively coupled plasma mass spectroscopy (ICP-MS) analyses of the solutions in which free-standing coatings loaded with varying concentrations of inhibitor compounds had been immersed. Inhibitor release from the epoxy coating was observed to be dependent on initial inhibitor concentration, inhibitor chemistry, and solution pH conditions. The coating systems with greater initial inhibitor loadings showed higher leaching rates, particularly in acidic environments. Following immersion, the absence of characteristic inhibitor peaks in the FTIR spectra of the coatings also confirmed leaching had taken place. Cross-sectional views of the coatings after exposure to the pH 1 environment presented a chloride infusion zone at the coating/solution interface where the inhibitor had leached out. The RE active inhibition provided by the leached RE carboxylate inhibitors was verified by exposure of a coating defect to a chloride contaminated environment.
History
Journal
ACS Applied Materials and InterfacesVolume
11Issue
39Pagination
36154 - 36168Publisher
ACS PublicationsLocation
Washington, D.C.Publisher DOI
ISSN
1944-8244eISSN
1944-8252Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
Categories
No categories selectedKeywords
rare earth carboxylateleaching behaviorepoxy coatingSEM\/EDScorrosion inhibitionScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials Scienceepoxy coating SEM\/EDSLANTHANUM 4-HYDROXY CINNAMATEAA2024-T3 ALUMINUM-ALLOYMILD-STEELCHROMATE INHIBITORLITHIUM-CARBONATECERIUM TARTRATECALCIUM-IONSPROTECTIONZINCRELEASE
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC