Alkaloid and Non-Alkaloid Ethanolic Extracts from Seeds of Garcinia Kola as Green Corrosion Inhibitors of Mild Steel in H2SO4 Solution

作者：Ikeuba A I^*; Okafor P C; Ekpe U J; Ebenso Eno E

来源：International Journal of Electrochemical Science, 2013, 8(5): 7455-7467.

DOI：10.1016/s1452-3981(23)14859-0

• Alkaloids
• Non-alkaloids
• Ethanolic
• Mild steel
• Corrosion Inhibitors
• Plant extract
• Acid corrosion

The inhibitive effects of the extracts of Garcinia kola seeds: ethanolic (EEGK), alkaloid ethanolic (AEGK) and non alkaloid ethanolic (NEGK) on the corrosion of mild steel in sulphuric acid medium was investigated using the hydrogen evolution (via gasometric assembly) and the weight loss methods at 307-373 K. The extracts were found to inhibit mild steel corrosion to different extents in the following order AEGK > EEGK > NEGK. The inhibition efficiency increased with increase in the concentration of the inhibitors and decrease in temperature. A phenomenon of physical adsorption is proposed for the inhibition from the trend of inhibition efficiency with temperature, E-a and Delta G(ads) values, and the process followed the Langmuir adsorption isotherm.

• 出版日期2013-5
• 单位西北大学