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Leaching Behavior and Corrosion Inhibition of a Rare Earth Carboxylate Incorporated Epoxy Coating System
journal contribution
posted on 2019-09-24, 11:03 authored by Yu Peng, Anthony E. Hughes, James I. Mardel, Glen B. Deacon, Peter C. Junk, Maria Forsyth, Bruce R. W. Hinton, Anthony E. SomersWhile 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.
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Keywords
coating systemsFTIR spectracoating defectpH 1 environmentleaching behaviorcoating systemmetal lossinhibitor chemistrycorrosion inhibitorsinhibitor compoundsleached RE carboxylate inhibitorsmetal surfacecarboxylate inhibitorscorrosion protection capabilitiesInhibitor releaseCross-sectional viewspaint coatings actLeaching Behaviorinhibitor loadingschloride infusion zoneinhibitor peakssolution pH conditionsacidic environmentsplasma mass spectroscopyCorrosion InhibitionRare Earth Carboxylate Incorporated Epoxy Coating Systemleaching ratesLeaching experimentsICP-MSinhibitor concentration
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