Corrosion Resistance and Thermal Stability Enhancement of Green Layered Clay/Epoxy Coating

Materials Science Forum Pub Date : 2024-03-05 DOI:10.4028/p-efeh4q

S. M. Kabeb, Azman Hassan, Farah Hanani Zulkifli, Farasuraya Che Zakaria, Atif Ur Rahman

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Abstract

A layered clay/epoxy coating was fabricated to investigate the effects of montmorillonite (MMT) and halloysite nanotube (HNT) loading at 0.5, 1.5, and 2.5 parts per hundred resin (phr) on the corrosion resistance and thermal stability of coated mild steel plates. The corrosion study was carried out by Electrochemical Impedance Spectroscopy (EIS) and Tafel polarization. The |Z|0.1Hz value, Rct, and Rp of the layered/clay epoxy coatings containing 1.5 phr of HNT and MMT exhibited the best anticorrosion performance compared to other clay content levels. The |Z|0.1Hz value for the epoxy coating filled with 1.5 phr of MMT (M1.5) is 2.132 × 109 Ω·cm², while it is slightly higher for H1.5 coatings, i.e., 2.629 × 109 Ω·cm². Water absorption trends were consistent with EIS and Tafel polarization studies. The presence of highly compatible nanocontainers clay reduced the total free volume and promoted cross-linking, enhancing anticorrosion performance. Thermal Gravimetry Analysis (TGA) showed that a 1.5 phr loading of MMT in layered/clay epoxy coating demonstrated better thermal stability than a coating embedded with HNT. This improvement can be attributed to the barrier effect of MMT, which retards the diffusion of oxygen molecules into the coating.

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增强绿色层状粘土/环氧树脂涂层的耐腐蚀性和热稳定性

为了研究蒙脱石（MMT）和海泡石纳米管（HNT）在 0.5、1.5 和 2.5 百分之一树脂（phr）含量下对涂层低碳钢板的耐腐蚀性和热稳定性的影响，制作了一种分层粘土/环氧涂层。腐蚀研究是通过电化学阻抗谱（EIS）和塔菲尔极化进行的。与其他粘土含量水平相比，含有 1.5 phr HNT 和 MMT 的层状/粘土环氧涂层的 |Z|0.1Hz 值、Rct 和 Rp 的防腐性能最佳。填充了 1.5 phr MMT 的环氧涂层（M1.5）的 |Z|0.1Hz 值为 2.132 × 109 Ω-cm²，而 H1.5 涂层的 |Z|0.1Hz 值稍高，为 2.629 × 109 Ω-cm²。吸水趋势与 EIS 和 Tafel 极化研究一致。高相容性纳米容器粘土的存在减少了总自由体积，促进了交联，从而提高了防腐性能。热重分析（TGA）表明，在分层/粘土环氧涂层中添加 1.5 phr 的 MMT 比嵌入 HNT 的涂层具有更好的热稳定性。这种改善可归因于 MMT 的阻隔效应，它能阻止氧分子扩散到涂层中。

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Materials Science Forum

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1.20

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