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Corrosion Protection of Mild-Steel Substrate Via Epoxy-Ester Coating Reinforced With Cerium (Iii)-Tannic Acid-Based Hybrid Pigment
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DOR
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20.1001.2.0021079099.1400.8.1.88.8
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نویسنده
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Amini Reza
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منبع
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كنگره بين المللي رنگ و پوشش - 1400 - دوره : 8 - کنگره بین المللی رنگ و پوشش - کد همایش: 00210-79099 - صفحه:1 -1
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چکیده
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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) [1-3]. 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 28 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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کلیدواژه
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Green Hybrid Pigment ,Self-Healing ,Epoxy-Ester Coatings ,Eis ,Mild Steel ,Potentiodynamic Polarization
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آدرس
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Institute For Color Science And Technology, Iran, Institute For Color Science And Technology (Icst), Department Of Surface Coatings And Corrosion, Iran, Institute For Color Science And Technology, Iran, Institute For Color Science And Technology, Iran
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Corrosion Protection of Mild-steel Substrate via Epoxy-ester Coating Reinforced with Cerium (III)-Tannic acid-based Hybrid Pigment
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Authors
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Amini Reza
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Abstract
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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) [1-3]. 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 28 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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Keywords
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Green hybrid pigment ,self-healing ,Epoxy-ester coatings ,EIS ,mild steel ,potentiodynamic polarization
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