Inhibitive action of some plant extracts on the corrosion of steel in acidic media
Inhibitive action of some plant extracts on the corrosion of steel in acidic media
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DOI：
10.1016/j.corsci.2005.09.017
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发表时间：
2006-09-01
影响因子：
8.3
通讯作者：
Saadawy, M.
中科院分区：
文献类型：
--
作者：
Abdel-Gaber, A. M.;Abd-El-Nabey, B. A.;Saadawy, M.
洋甘菊（Chamaemelum mixtum L.）Halfabar（Cymbopogon proximus），黑孜然（Nigella sativa L.），和菜豆（Phaseolus vulgaris L.）采用电化学阻抗谱（EIS）和动电位极化技术研究了1 M硫酸溶液中3种植物对钢铁腐蚀的影响。EIS测试表明，钢的溶解过程在活化控制下进行。动电位极化曲线表明，植物提取物表现为混合型缓蚀剂。计算了各萃取物对碳钢的腐蚀速率和缓蚀率。结果表明，该植物提取液对硫酸介质中的钢铁有良好的缓蚀作用。抑制被认为是增加的植物提取物的浓度增加到一个临界浓度。根据稳定络合物在钢表面的吸附，讨论了植物提取物的缓蚀作用。不同的等温线，朗缪尔，Flory-Huggins，和动力学热力学模型的理论拟合，进行了测试，以澄清吸附的性质。(c)2005爱思唯尔有限公司保留所有权利。
The effect of extracts of Chamomile (Chamaemelum mixtum L.), Halfabar (Cymbopogon proximus), Black cumin (Nigella sativa L.), and Kidney bean (Phaseolus vulgaris L.) plants on the corrosion of steel in aqueous I M sulphuric acid were investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. EIS measurements showed that the dissolution process of steel occurs under activation control. Potentiodynamic polarization curves indicated that the plant extracts behave as mixed-type inhibitors. The corrosion rates of steel and the inhibition efficiencies of the extracts were calculated. The results obtained show that the extract solution of the plant could serve as an effective inhibitor for the corrosion of steel in sulphuric acid media. Inhibition was found to increase with increasing concentration of the plant extract up to a critical concentration. The inhibitive actions of plant extracts are discussed on the basis of adsorption of stable complex at the steel surface. Theoretical fitting of different isotherms, Langmuir, Flory-Huggins, and the kinetic thermodynamic model, were tested to clarify the nature of adsorption. (c) 2005 Elsevier Ltd. All rights reserved.