Abstract

Epoxy ester coating with dual active inhibition and passive barrier anti-corrosion properties was constructed using a novel hybrid pigment based on the cerium nitrate and tannic acid (Ce-TAA). At first, the inorganic-organic pigment was synthesized and then characterized by FTIR, TGA, and Raman methods. Electrochemical measurements evidenced an inhibition degree of 81% for the metal sample exposed to the saline solution containing the Ce-TAA pigment extract. The polarization test showed significant corrosion current density reduction via a mixed corrosion retardation mechanism. According to the UV–visible and ICP analyses outcomes, the solubility of the hydrophilic tannic acid and cerium nitrate decreased in the cerium-tannate complex. EIS results evidenced that the |Z|at10 mHz and Rct values of the Ce-TAA containing coating with defect increased over time. Besides, up to 21 days of immersion, the Ө values near to −90° and the |Z|10 mHz > 107 Ω·cm2 were recorded for the intact coating containing Ce-TAA pigment. Via FE-SEM/EDS analyses the released inhibitive species were detected on the scratched areas of the coating.

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