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

共 48 条

[21]

GIANNETTI BF, 1992, ECLET QUIM, V17, P79

[22] Electrochemical evidence of caffeine adsorption on zinc surface in ethanol [J].

Grosser, Fabiana Nogueira ;

Goncalves, Reinaldo Simoes .

CORROSION SCIENCE, 2008, 50 (10) :2934-2938

[23] Eco friendly inhibitor for corrosion inhibition of mild steel in phosphoric acid medium [J].

Gunasekaran, G ;

Chauhan, LR .

ELECTROCHIMICA ACTA, 2004, 49 (25) :4387-4395

[24] ACTION OF POLAR ORGANIC INHIBITORS IN ACID DISSOLUTION OF METALS [J].

HACKERMAN, N ;

MAKRIDES, AC .

INDUSTRIAL AND ENGINEERING CHEMISTRY, 1954, 46 (03) :523-527

[25] The effect of various naturally occurring metal-binding compounds on the electrochemical behavior of aluminum [J].

Hansen, DC ;

McCafferty, E .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (01) :114-119

[26] STRUCTURAL EFFECTS OF ORGANIC-COMPOUNDS AS CORROSION-INHIBITORS FOR HYDROGEN ENTRY INTO IRON IN SULFURIC-ACID [J].

KOBAYASHI, K ;

SHIMIZU, K ;

IIDA, M .

CORROSION SCIENCE, 1993, 35 (5-8) :1431-1435

[27] Does caffeine bind to metal ions? [J].

Kolayli, S ;

Ocak, M ;

Küçük, M ;

Abbasoglu, R .

FOOD CHEMISTRY, 2004, 84 (03) :383-388

[28] ELECTROCHEMICAL AND QUANTUM-CHEMICAL STUDY OF PROPARGYL ALCOHOL ADSORPTION ON IRON [J].

KUTEJ, P ;

VOSTA, J ;

PANCIR, J ;

HACKERMAN, N .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1995, 142 (06) :1847-1850

[29] Electrochemical and quantum chemical studies on the formation of protective films by alkynols on iron [J].

Lendvay-Györik, G ;

Mészáros, G ;

Lengyel, B ;

Lendvay, G .

CORROSION SCIENCE, 2003, 45 (08) :1685-1702

[30]

Makato Y., 2000, J SURF FINISH SOC JA, V51, P524

← 1 2 3 4 5 →