黄杉茎生物碱在一摩尔硫酸溶液中对低碳钢的绿色缓蚀作用

Onisha Thapa, Jamuna Thapa Magar, H. Oli, Anil Rajaure, Durga Nepali, D. Bhattarai, Tanka Mukhiya
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引用次数: 2

摘要

酸洗过程中残留的离子会引起金属的进一步腐蚀,这可以通过使用绿色抑制剂来最小化。从植物中提取的生物碱是一种经济有效的抑制剂。本研究成功地从黄果茄茎中提取了生物碱,并对其进行了定性化学试验和光谱测定。提取生物碱作为绿色缓蚀剂用于低碳钢。通过失重法和电化学测定法确定了缓蚀剂的有效性。减重测试结果表明,其最大缓蚀率为93.14%。温度效应研究表明,该抑制剂的工作温度可达58℃。这可能是报道的绿色抑制剂中最高的工作温度之一。电化学测定结果表明,生物碱可有效抑制高达98.14%的腐蚀,是一种混合型缓蚀剂。动力学参数的研究表明,缓蚀剂形成了保护低碳钢表面免受腐蚀的潜在屏障。热力学参数研究结果表明,该过程为自发吸热过程。综上所述,从黄杉中提取的生物碱可作为一种优良的、环保的绿色缓蚀剂,具有良好的抗低碳钢腐蚀的应用前景。
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Alkaloids of Solanum xanthocarpum Stem as Green Inhibitor for Mild Steel Corrosion in One Molar Sulphuric Acid Solution
The residual ions of the acid cleaning processes induce the further corrosion of the metals, and this could be minimized using green inhibitors. Alkaloids extracted from plant parts could be cost effective and efficient inhibitors. In this work, alkaloids from Solanum xanthocarpum stem were successfully extracted, and they were characterized by qualitative chemical tests and spectroscopic measurements. As-extracted alkaloids were employed as green corrosion inhibitors for mild steel. The effectiveness of the inhibitor was determined by the weight loss and electrochemical measurement methods. From the weight loss measurement, the maximum inhibition efficiency of 93.14% was achieved. The temperature effect study revealed that the inhibitor can work up to a temperature of 58 °C. This could be one of the highest working temperatures among the reported green inhibitors. The electrochemical measurement reveals that the alkaloids could inhibit effectively up to 98.14% of the corrosion and serve as a mixed-type green inhibitor. A study on the kinetic parameters reflects that the inhibitor forms a potential barrier for the protection of a mild steel surface against corrosion. The values obtained from the thermodynamic parameters study reflect that the process is a spontaneous endothermic process. Based on the findings, it is revealed that the alkaloids extracted from S. xanthocarpum can serve as an excellent, eco-friendly and a promising green inhibitor against mild steel corrosion.
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