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Abstract
In this work, two primers with organic corrosion inhibitors were extracted from Pinus radiata bark, from the waste generated by the timber and paper industries. The process resulted in a water-soluble fraction (WSF) and water-insoluble fraction (WIF). The additives were incorporated in a two-component (2 K) primer based on epoxy-polyamide resin with a ratio formulation of λ = 0.85 (PVC = 34.79). Spectroscopy techniques, such as electron paramagnetic resonance (EPR), high-performance liquid chromatography (HPLC), Raman spectroscopy, and electrochemical impedance spectroscopy (EIS) were used for both the extract and coating characterizations. Coating performances were obtained in the order of 109 Ω. cm2 for the impedance, and the systems were simulated using a circuit (R1(Q1(R2(Q2(R3(R4C))))). The formation of tannin-Fe complexes was demonstrated using RAMAN spectroscopy.
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