<i>Acacia catechu</i> 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 <i>Acacia catec...
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MDPI AG
2022-10-01
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| Series: | Electrochem |
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| author | Rajaram Karki Ajay Kumar Bajgai Nawaraj Khadka Onisha Thapa Tanka Mukhiya Hari Bhakta Oli Deval Prasad Bhattarai |
| author_facet | Rajaram Karki Ajay Kumar Bajgai Nawaraj Khadka Onisha Thapa Tanka Mukhiya Hari Bhakta Oli Deval Prasad Bhattarai |
| author_sort | Rajaram Karki |
| collection | DOAJ |
| description | 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 <i>Acacia catechu</i> have been used as green corrosion inhibitors for mild steel corrosion in a 1 M H<sub>2</sub>SO<sub>4</sub> 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 <i>Acacia catechu</i> can be a promising green inhibitors for mild steel corrosion. |
| first_indexed | 2024-03-09T17:01:46Z |
| format | Article |
| id | doaj.art-9a29ffa1b5714a689fa750369715f9c0 |
| institution | Directory Open Access Journal |
| issn | 2673-3293 |
| language | English |
| last_indexed | 2024-03-09T17:01:46Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electrochem |
| spelling | doaj.art-9a29ffa1b5714a689fa750369715f9c02023-11-24T14:29:14ZengMDPI AGElectrochem2673-32932022-10-013466868710.3390/electrochem3040044<i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid SolutionRajaram Karki0Ajay Kumar Bajgai1Nawaraj Khadka2Onisha Thapa3Tanka Mukhiya4Hari Bhakta Oli5Deval Prasad Bhattarai6Department of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, NepalDepartment of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, NepalDepartment of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, NepalDepartment of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, NepalDepartment of Chemistry, Bhaktapur Multiple Campus, Tribhuvan University, Bhaktapur 44800, NepalDepartment of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, NepalDepartment of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, NepalIn 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 <i>Acacia catechu</i> have been used as green corrosion inhibitors for mild steel corrosion in a 1 M H<sub>2</sub>SO<sub>4</sub> 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 <i>Acacia catechu</i> can be a promising green inhibitors for mild steel corrosion.https://www.mdpi.com/2673-3293/3/4/44<i>Acacia catechu</i>green inhibitormild steelweight-losspolarizationthermodynamic parameters |
| spellingShingle | Rajaram Karki Ajay Kumar Bajgai Nawaraj Khadka Onisha Thapa Tanka Mukhiya Hari Bhakta Oli Deval Prasad Bhattarai <i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution Electrochem <i>Acacia catechu</i> green inhibitor mild steel weight-loss polarization thermodynamic parameters |
| title | <i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution |
| title_full | <i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution |
| title_fullStr | <i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution |
| title_full_unstemmed | <i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution |
| title_short | <i>Acacia catechu</i> Bark Alkaloids as Novel Green Inhibitors for Mild Steel Corrosion in a One Molar Sulphuric Acid Solution |
| title_sort | i acacia catechu i bark alkaloids as novel green inhibitors for mild steel corrosion in a one molar sulphuric acid solution |
| topic | <i>Acacia catechu</i> green inhibitor mild steel weight-loss polarization thermodynamic parameters |
| url | https://www.mdpi.com/2673-3293/3/4/44 |
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