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Solanum nigrum as natural source of corrosion inhibitor for mild steel in sulphuric acid medium

机译：龙葵作为硫酸介质中低碳钢腐蚀抑制剂的天然来源

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摘要

The corrosion inhibition potential of mild steel in 1M H_2SO_4 by Solanum nigrum extract was studied using weight loss method, potentiodynamic polarisation method, ac impedance studies and SEM technique. Weight loss measurements, carried out at three different temperatures, 303, 313 and 323 K, revealed the increase in inhibition efficiency with increasing concentration of the plant extract as well as the temperature of the system. Thus, the inhibitor exhibited the chemisorption mechanism following Temkin adsorption isotherm. Free energy of activation AG was also calculated so as to confirm the chemisorption process. Results of polarisation study revealed the mixed mode of inhibition. SEM studies supported the adsorption of inhibitor over the metal surface. The anticorrosion effect of S. nigrum is attributed to the presence of solasodine which was isolated and studied by theoretical, electrochemical and IR techniques. The possible adsorption mechanism of the inhibition is discussed vis-a-vis the presence of hetero atoms of solasodine.
机译：利用失重法，恒电位极化法，交流阻抗法和扫描电镜技术研究了龙葵提取物对1M H_2SO_4中低碳钢的缓蚀潜力。在三种不同的温度303、313和323 K下进行的重量损失测量表明，抑制效率随植物提取物浓度的升高以及系统温度的升高而提高。因此，该抑制剂在Temkin吸附等温线后表现出化学吸附机理。还计算了活化AG的自由能，以确认化学吸附过程。极化研究的结果揭示了混合的抑制模式。 SEM研究支持抑制剂在金属表面的吸附。黑链霉菌的抗腐蚀作用归因于索拉索定的存在，该索拉索定是通过理论，电化学和红外技术分离和研究的。相对于索拉索定杂原子的存在，讨论了抑制作用的可能吸附机理。

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