Leaching Behavior and Corrosion Inhibition of a Rare Earth Carboxylate Incorporated Epoxy Coating System Yu Peng Anthony E. Hughes James I. Mardel Glen B. Deacon Peter C. Junk Maria Forsyth Bruce R. W. Hinton Anthony E. Somers 10.1021/acsami.9b13722.s001 https://acs.figshare.com/articles/journal_contribution/Leaching_Behavior_and_Corrosion_Inhibition_of_a_Rare_Earth_Carboxylate_Incorporated_Epoxy_Coating_System/9896525 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. 2019-09-24 11:03:46 coating systems FTIR spectra coating defect pH 1 environment leaching behavior coating system metal loss inhibitor chemistry corrosion inhibitors inhibitor compounds leached RE carboxylate inhibitors metal surface carboxylate inhibitors corrosion protection capabilities Inhibitor release Cross-sectional views paint coatings act Leaching Behavior inhibitor loadings chloride infusion zone inhibitor peaks solution pH conditions acidic environments plasma mass spectroscopy Corrosion Inhibition Rare Earth Carboxylate Incorporated Epoxy Coating System leaching rates Leaching experiments ICP-MS inhibitor concentration