Rajaram Karki, Ajay Kumar Bajgai, N. Khadka, Onisha Thapa, Tanka Mukhiya, H. Oli, D. Bhattarai
{"title":"儿茶树皮生物碱作为新型绿色缓蚀剂在一摩尔硫酸溶液中对低碳钢的腐蚀","authors":"Rajaram Karki, Ajay Kumar Bajgai, N. Khadka, Onisha Thapa, Tanka Mukhiya, H. Oli, D. Bhattarai","doi":"10.3390/electrochem3040044","DOIUrl":null,"url":null,"abstract":"In situ corrosion inhibition in acid cleaning processes by using green inhibitors is at the forefront of corrosion chemistry. Plant extracts, especially alkaloids, are known to be good corrosion inhibitors against mild steel corrosion. In this research, alkaloids extracted from Acacia catechu have been used as green corrosion inhibitors for mild steel corrosion in a 1 M H2SO4 solution. Qualitative chemical tests and FTIR measurements have been performed to confirm the alkaloids in the extract. The inhibition efficiency of the extract has been studied by using weight-loss and potentiodynamic polarization methods. A weight-loss measurement has been adopted for the study of inhibitor’s concentration effect, with a variation employed to measure the inhibition efficiency for time and temperature. The weight-loss measurement revealed a maximum efficiency of 93.96% after 3 h at 28 °C for a 1000 ppm alkaloid solution. The 1000 ppm inhibitor is effective up to a temperature of 48 °C, with 84.39% efficiency. The electrochemical measurement results revealed that the alkaloids act as a mixed type of inhibitor. Inhibition efficiencies of 98.91% and 98.54% in the 1000 ppm inhibitor concentration solution for the as-immersed and immersed conditions, respectively, have been achieved. The adsorption isotherm has indicated the physical adsorption of alkaloids. Further, the spontaneous and endothermic adsorption processes have been indicated by the thermodynamic parameters. The results show that alkaloids extracted from the bark of Acacia catechu can be a promising green inhibitors for mild steel corrosion.","PeriodicalId":11612,"journal":{"name":"Electrochem","volume":"12 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Acacia catechu Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution\",\"authors\":\"Rajaram Karki, Ajay Kumar Bajgai, N. Khadka, Onisha Thapa, Tanka Mukhiya, H. Oli, D. Bhattarai\",\"doi\":\"10.3390/electrochem3040044\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In situ corrosion inhibition in acid cleaning processes by using green inhibitors is at the forefront of corrosion chemistry. Plant extracts, especially alkaloids, are known to be good corrosion inhibitors against mild steel corrosion. 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Inhibition efficiencies of 98.91% and 98.54% in the 1000 ppm inhibitor concentration solution for the as-immersed and immersed conditions, respectively, have been achieved. The adsorption isotherm has indicated the physical adsorption of alkaloids. Further, the spontaneous and endothermic adsorption processes have been indicated by the thermodynamic parameters. 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引用次数: 4
摘要
在酸洗过程中使用绿色缓蚀剂的现场缓蚀是腐蚀化学的前沿。植物提取物,特别是生物碱,是抗低碳钢腐蚀的良好缓蚀剂。在本研究中,从儿茶中提取的生物碱作为绿色缓蚀剂用于1 M H2SO4溶液中低碳钢的腐蚀。定性化学试验和红外光谱测定证实了提取物中的生物碱。采用失重法和动电位极化法研究了提取物的抑菌效果。采用失重法研究缓蚀剂的浓度效应,采用变分法测量缓蚀剂的缓蚀效率随时间和温度的变化。失重测量结果显示,在28℃条件下,1000 ppm生物碱溶液中,失重3 h后,失重效率最高达93.96%。1000ppm的缓蚀剂在48°C的温度下有效,效率为84.39%。电化学测定结果表明,生物碱是一种混合型缓蚀剂。在1000 ppm的缓蚀剂溶液中,浸没和浸没条件下的缓蚀效率分别为98.91%和98.54%。吸附等温线显示了生物碱的物理吸附。此外,热力学参数还表明了自发吸附过程和吸热吸附过程。结果表明,从儿茶树皮中提取的生物碱是一种很有前途的绿色缓蚀剂。
Acacia catechu Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution
In situ corrosion inhibition in acid cleaning processes by using green inhibitors is at the forefront of corrosion chemistry. Plant extracts, especially alkaloids, are known to be good corrosion inhibitors against mild steel corrosion. In this research, alkaloids extracted from Acacia catechu have been used as green corrosion inhibitors for mild steel corrosion in a 1 M H2SO4 solution. Qualitative chemical tests and FTIR measurements have been performed to confirm the alkaloids in the extract. The inhibition efficiency of the extract has been studied by using weight-loss and potentiodynamic polarization methods. A weight-loss measurement has been adopted for the study of inhibitor’s concentration effect, with a variation employed to measure the inhibition efficiency for time and temperature. The weight-loss measurement revealed a maximum efficiency of 93.96% after 3 h at 28 °C for a 1000 ppm alkaloid solution. The 1000 ppm inhibitor is effective up to a temperature of 48 °C, with 84.39% efficiency. The electrochemical measurement results revealed that the alkaloids act as a mixed type of inhibitor. Inhibition efficiencies of 98.91% and 98.54% in the 1000 ppm inhibitor concentration solution for the as-immersed and immersed conditions, respectively, have been achieved. The adsorption isotherm has indicated the physical adsorption of alkaloids. Further, the spontaneous and endothermic adsorption processes have been indicated by the thermodynamic parameters. The results show that alkaloids extracted from the bark of Acacia catechu can be a promising green inhibitors for mild steel corrosion.