Medicago sativa as a green corrosion inhibitor for 1018 carbon steel in 0.5 M H2SO4 solution

被引：18
作者：
Rodriguez Torres, A. [1 ]
Valladares Cisneros, M. G. [2 ]
Gonzalez Rodriguez, J. G. [1 ]
机构：
[1] Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Cuernavaca, Morelos, Mexico
[2] Univ Autonoma Estado Morelos, Fac Ciencias Quim & Ingn, Cuernavaca, Morelos, Mexico
来源：
GREEN CHEMISTRY LETTERS AND REVIEWS | 2016年 / 9卷 / 03期
关键词：
Corrosion; green inhibitor; electrochemical impedance spectroscopy; HYDROCHLORIC-ACID SOLUTION; MILD-STEEL; EXTRACT; HCL; ADSORPTION; DERIVATIVES; FLAVONOIDS; EFFICIENCY; MECHANISM; TOXICITY;
D O I：
10.1080/17518253.2016.1195017
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A study on the use of the methanol extract of Medicago sativa as a green corrosion inhibitor for 1018 carbon steel in 0.5 M of sulfuric acid has been carried out by using potentiodynamic polarization curves, electrochemical impedance spectroscopy and gravimetric tests. Testing temperatures were 25 degrees C, 40 degrees C and 60 degrees C. Results showed that M. sativa is a good corrosion inhibitor, with its efficiency increasing with its concentration and with time, but decreasing with the temperature. M. sativa forms a passive film on top of the steel with a passive current density and pitting potential values lower than that for uninhibited solution, and remained on the steel for 8-12 h. This film formed by iron ions and heteroatoms present in OH- and amine groups from the extract are adsorbed on the steel and form a protective film on to the steel.
引用
收藏
页码：143 / 155
页数：13
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