Leaching behavior and corrosion inhibition of a rare earth carboxylate incorporated epoxy coating system

Peng, Yu, Hughes, Anthony E., Mardel, James I., Deacon, Glen B., Junk, Peter C., Forsyth, Maria, Hinton, Bruce R.W., and Somers, Anthony E. (2019) Leaching behavior and corrosion inhibition of a rare earth carboxylate incorporated epoxy coating system. Applied Materials and Interfaces, 11 (39). pp. 36154-36168.

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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.

Item ID: 60703
Item Type: Article (Research - C1)
ISSN: 1944-8252
Keywords: rare earth carboxylate, leaching behavior, epoxy coating SEM/EDS, corrosion inhibition
Copyright Information: © 2019 American Chemical Society.
Funders: Deakin University (DU), Australian Research Council (ARC)
Projects and Grants: DU Alfred Deakin Postdoctoral Research Fellowship, ARC Discovery Project DP180101465
Date Deposited: 23 Oct 2019 07:44
FoR Codes: 34 CHEMICAL SCIENCES > 3402 Inorganic chemistry > 340203 F-block chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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