Corrosion inhibition properties of Gongronema latifollium extract in acidic media

被引：15
作者：
Akalezi, C. O. [1 ]
Ogukwe, C. E. [1 ]
Ejele, E. A. [2 ]
Oguzie, E. E. [1 ]
机构：
[1] Fed Univ Technol Owerri, Electrochem & Mat Sci Unit EMRU, Dept Chem, Sch Sci, Owerri, Nigeria
[2] Fed Univ Technol Owerri, Dept Chem, Sch Phys Sci, Owerri, Nigeria
来源：
INTERNATIONAL JOURNAL OF CORROSION AND SCALE INHIBITION | 2016年 / 5卷 / 03期
关键词：
Gongronemena latifolium; mild steel; corrosion inhibition; hydrochloric acid;
D O I：
10.17675/2305-6894-2016-5-3-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corrosion inhibition of mild steel in 1 M HCl acid solution by Gongronemena latifolium (GL) extract was investigated by weight-loss and electrochemical techniques. A significant decrease in the corrosion rate of mild steel was observed in the presence of the investigated additive and the inhibition efficiency was found to depend on the concentration of the GL extract. The potentiodynamic polarization data indicated that this additive was of mixed type, but the anodic effect was more pronounced. Nyquist plots showed that on increasing the extract concentration, the charge transfer resistance increased and double layer capacitance decreased. Adsorption of inhibitor GL extract on the mild steel surface is found to obey the Langmuir adsorption isotherm. Increase in activation energy of corrosion process in presence of GL extract indicates physical adsorption.
引用
收藏
页码：232 / 247
页数：16
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