Aqueous extracts of olive roots, stems, and leaves as eco-friendly corrosion inhibitor for steel in 1 MHCl medium
Aqueous extracts of olive roots, stems, and leaves as eco-friendly corrosion inhibitor for steel in 1 MHCl medium
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DOI：
10.1007/s40090-015-0042-z
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发表时间：
2015-11-01
影响因子：
2.4
通讯作者：
Warad, Ismail
中科院分区：
文献类型：
--
作者：
Bouknana, Driss;Hammouti, Belkheir;Warad, Ismail
本文研究了橄榄（Olea europaea L.）叶、根和茎的水提取物在不同温度和浓度下对1 M HCl溶液中低碳钢的腐蚀效果。采用极化曲线和电化学阻抗谱（EIS）方法评价腐蚀速率和缓蚀效率。在1 M HCl条件下，橄榄根提取物（ORE）、橄榄茎提取物（OSE）和橄榄叶提取物（OLE）的缓蚀效率分别为89.24%、88.84%和89.83%。结果表明，不同萃取物对试验体系均有较好的缓蚀剂作用。讨论了提取物的抑制作用，从其组分在钢表面的吸附出发，形成了质量和电荷传递的屏障。萃取组分在钢表面的吸附是一个自发的过程，提高了腐蚀过程的活化能。随着温度的升高，缓蚀效率大大降低。实验结果表明，随着样品萃取液浓度的增加，缓蚀效果逐渐提高。极化研究表明，橄榄叶、根和茎提取物可作为混合抑制剂。
This work is devoted to examine the effectiveness of the aqueous extracts of olive (Olea europaea L.) leaves, roots, and stems on corrosion of mild steel in 1 M HCl solution using the weight loss measurement at various temperature and concentration effects. Polarization curves and electrochemical impedance spectroscopy (EIS) methods were employed to evaluate corrosion rate and inhibition efficiency. Corrosion inhibition efficiencies of 89.24, 88.84, and 89.83 % were achieved in 1 M HCl for olive root extract (ORE), olive stem extract (OSE), and olive leaf extract (OLE), respectively. It was found that the different extracts act as a good corrosion inhibitor for the tested system. The inhibitive action of the extract is discussed with a view to the adsorption of its components onto the steel surface which made a barrier to mass and charge transfer. The adsorption of extract components onto the steel surface was found to be a spontaneous process and increases the activation energy of the corrosion process. The inhibition efficiency is greatly reduced as the temperature increased. Experimental results show that corrosion inhibition efficiency increases with concentration of the sample extract. Polarization studies show that olive leaf, root, and stem extracts act as a mixed inhibitor.