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

被引：47

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

页码：81 / 90

页数：10

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