Assessment of Caffeine Adsorption onto Mild Steel Surface as an Eco-Friendly Corrosion Inhibitor

被引：45
作者：
de Souza, Fernando S. [1 ]
Goncalves, Reinaldo S. [2 ]
Spinelli, Almir [1 ]
机构：
[1] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil
[2] Univ Fed Rio Grande do Sul, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
来源：
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2014年 / 25卷 / 01期
关键词：
mild steel; caffeine; adsorption; electrochemical techniques; surface analysis; LOW-CARBON STEEL; PROPARGYL ALCOHOL; SUCCINIC ACID; ORGANIC-COMPOUNDS; IRON; MEDIA; FLUORESCENCE; DERIVATIVES; MECHANISM; BEHAVIOR;
D O I：
10.5935/0103-5053.20130270
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The adsorption and corrosion-inhibition properties of caffeine as an eco-friendly corrosion inhibitor for mild steel in acid medium were investigated by electrochemical and spectroscopic techniques. Polarization experiments indicated that caffeine behaves as a cathodic-type inhibitor. Impedance data showed that surface coverage increased with caffeine concentration in the range of 1.0 to 10.0 mmol L-1. The maximum inhibition efficiency obtained was 92.4%. The adsorption of the corrosion inhibitor was consistent with the Frumkin adsorption isotherm with a free energy of adsorption of -66.1 kJ mol(-1). Contact angle measurements revealed the formation of a hydrophobic protective film, while scanning electron microscopy, energy dispersive spectroscopy and fluorescence experiments clearly verified the presence of caffeine on the surface.
引用
收藏
页码：81 / 90
页数：10
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