Thymus Vulgarise Extract as Nontoxic Corrosion Inhibitor for Copper and α-Brass in 1 M HNO3 Solutions

被引：0

作者：

Fouda, A. S. ^{[1
]}

Shalabi, K. ^{[1
]}

Idress, A. A. ^{[2
]}

机构：

[1] Mansoura Univ, Fac Sci, Dept Chem, Mansoura 35516, Egypt

[2] Omar Almukhtar Univ, Dept Chem, Fac Sci, Albayda, Libya

来源：

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2014年 / 9卷 / 09期

关键词：

Copper; alpha-Brass; Corrosion inhibition; Thymus Vulgarise; HNO3; EIS; EFM; SEM; EDX; ELECTROCHEMICAL FREQUENCY-MODULATION; ADSORPTION BEHAVIOR; MILD-STEEL; BENZOTRIAZOLE DERIVATIVES; ACID; IRON; CHLORIDE; IMPEDANCE; ALLOYS; HCL;

D O I：

暂无

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The efficiency of Thymus vulgarise extract (TVE) as a nontoxic corrosion inhibitor for copper and alpha-brass in 1 M HNO3 has been tested by weight loss and electrochemical techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The calculated adsorption thermodynamic parameters indicated that the adsorption was a spontaneous, exothermic process accompanied by a decrease in entropy. The inhibition efficiency increases with increasing the concentration of the extract in HNO3 solution and decreases with increasing the temperature. The adsorption of the extract on the copper and alpha-brass surfaces in the acid solution was found to obey Langmuir's adsorption isotherm. Scanning electron microscope (SEM) results showed the formation of a protective film on the copper and alpha-brass surfaces in the presence of TVE. The results obtained from different techniques were in good agreement.

引用

页码：5126 / 5154

页数：29

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