The development of eco-efficient and environmentally friendly active anticorrosion coatings for metal substrates represents a fundamental step in many engineering applications. In this work, a novel corrosion inhibitor was elaborated beidellite clay (Na-BDT) and an aqueous extract of Daphne Gnidium (DGE). The modification of the clay by DGE was monitored and characterized using cyclic voltammetry (CV), X-ray diffraction (XRD), UV/visible spectroscopy (UV/Vis), and Fourier transform infrared spectroscopy (FT-IR) techniques. The results showed that the clay modification was successfully achieved, with a DGE adsorbed amount of approximately 99 mg/g. Mild steel is effectively protected against corrosion in 0.1 M NaCl solution thanks to the progressive release of DGE, resulting in the lowest corrosion current density (7.22 µA/cm) and the highest charge transfer resistance (7.20 kΩ.cm) after 48 h of immersion. The calculated inhibition efficiency reaches a maximum of approximately 83 %. DGE-modified clay (DGE-BDT) was then dispersed into an alkyd resin (5 wt%) to enhance the corrosion protection of mild steel. The anti-corrosion performance was maintained over a long period of time and remains higher than that of the coating containing a commercial triphosphate aluminum (TPA) corrosion inhibitor.

中文翻译：

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贝得石粘土封装的瑞香叶提取物的腐蚀保护：一种有效的颜料，可用于持久且环保的涂料配方

用于金属基材的生态高效且环保的活性防腐涂料的开发代表了许多工程应用的基本步骤。在这项工作中，一种新型腐蚀抑制剂是贝得石粘土（Na-BDT）和瑞香水提取物（DGE）。使用循环伏安法 (CV)、X 射线衍射 (XRD)、紫外/可见光谱 (UV/Vis) 和傅里叶变换红外光谱 (FT-IR) 技术监测和表征 DGE 对粘土的改性。结果表明，粘土改性成功，DGE吸附量约为99 mg/g。由于 DGE 的逐渐释放，低碳钢在 0.1 M NaCl 溶液中可有效防止腐蚀，在浸泡 48 小时后产生最低的腐蚀电流密度 (7.22 µA/cm) 和最高的电荷转移电阻 (7.20 kΩ.cm) 。计算出的抑制效率最高可达约83%。然后将 DGE 改性粘土 (DGE-BDT) 分散到醇酸树脂 (5 wt%) 中，以增强低碳钢的腐蚀防护。其防腐性能可长期保持，且仍高于含有商用三磷酸铝（TPA）缓蚀剂的涂层。