научная статья по теме SOME TETRAZOLIC COMPOUNDS AS CORROSION INHIBITORS FOR COPPER IN NITRIC ACID MEDIUM Комплексное изучение отдельных стран и регионов

Текст научной статьи на тему «SOME TETRAZOLIC COMPOUNDS AS CORROSION INHIBITORS FOR COPPER IN NITRIC ACID MEDIUM»

CATALYSIS FOR RENEWABLE ENERGY

SOME TETRAZOLIC COMPOUNDS AS CORROSION INHIBITORS FOR COPPER IN NITRIC ACID MEDIUM

M. Mihit*, L. Bazzi*, R. Salghi**, B. Hammouti***, S. El Issami*, E. Ait Addi****

*Faculté des Sciences d'Agadir, Laboratoire Environnement & Matériaux, Equipe de Chimie Physique Appliquées, BP 8106, 80000 Agadir,

Morocco. Telephone 00 212 28 09 57 Fax 00 212 28 22 01 00, E-mail: lahcen_bazzi@yahoo.fr

**Ecole National des Sciences Appliquées d'Agadir, Laboratoire d'Ingénierie des Procédés de l'Energie & de l'Environnement, BP 1136, 80000

Agadir, Morocco. Telephone 00 212 28 22 83 13 Fax 00 212 28 23 20 07, E-mail: salghi@ensa-agadir.ac.ma

***Faculté des Sciences d'Oujda, Laboratoire de Chimie Appliquée & Environnement,B. P 717, Oujda, Morocco. Telephone 00 212 68 63 22 73 Fax 00 212 36 500 603, E-mail: hammoutib@gmail.com

****Ecole Supérieure de Technologie d'Agadir, Département Bio-industrie, BP 33/S, 80000 Agadir, Morocco.

Telephone 00 212 28 23 25 83 Fax 00 212 28 22 78 24, E-mail: habib@esta.ac.ma

**Author for correspondence, Pr. R. Salghi, Ecole National des Sciences Appliquées d'Agadir, BP 1136, Agadir, Morocco.

Phone 00 212 28 22 83 13 Fax 00 212 28 23 20 07, E-mail salghi@ensa-agadir.ac.ma

Received: 31 July 2007; accepted: 25 Aug 2007

The corrosion inhibition of copper in 0.1 M HNO3 was studied by gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements by the use of tetrazolic compounds such as 1,2,3,4-tetrazole (TTZ), 1-phenyl-1,2,3,4-tetrazole (PT), 5-amino-1,2,3,4-tetrazole (AT) and 1-phenyl-5-mercapto-1,2,3,4-tetrazole (PMT). The addition of these compounds acts differently on the kinetic of corrosion process of copper in nitric medium. The comparative study indicates that PMT is the best inhibitor. Its inhibition efficiency increases while its concentration increases in solution to attain 97 % at 10-3 M. Electrochemical measurements show that both polarization and transfer resistances increase with PMT concentration. The adsorption of PMT on the copper surface followed the Frumkin isotherm model. The results obtained from the various methods are in good agreement.

Keywords: thermodynamic analysis in alternative energy, corrosion, inhibition, copper, nitric acid, tetrazole

Organization: Faculty of Science Agadir Morocco. He was awarded a PhD degree in Corrosion field in 2006.

Main range of scientific interests: Corrosion and the inhibition of the corrosion of copper and its alloys by organics and inorganics compounds. Pubications: More than 10 papers in corrosion.

Mohammed Mihit

Lahcen Bazzi

Organization: Faculty of Science Agadir Morocco. He was awarded a PhD degree in Corrosion Science in 1995. He is currently a teacher and researcher in the Laboratory of Materials & Environment.

Education: University Ibn Zohr, Faculty of Science, PhD degree in corrosion (1995). Ecole Normale Supérieure Rabat, Doctorat (DES), 1987.

Experience: University Ibn Zohr, Faculty of Science Agadir, Professor B (2003 - to date).

University Ibn Zohr, Faculty of Science Agadir, Professor A (2000-2003).

University Ibn Zohr, Faculty of Science Agadir, lecturer Professor (1995-1999).

University Ibn Zohr, Faculty of Science Agadir, Assistant Professor (1988-1994).

Main range of scientific interests: The research interest covers corrosion inhibition of aluminium, tin

and tinplate in industrial water by oxoanions, tetrazole, pyrazole and aminoacid and ester compounds.

Additionally, he works on pesticide degradation in water, soil, fruits and vegetables.

Pubications: He has published more than 40 papers in corrosion and sensors fields.

Международный научный журнал «Альтернативная энергетика и экология» № 6 (62) 2008 © Научно-технический центр «TATA», 2008

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Rachid Salghi

Belkhir Hammouti

Souad El Issami

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El Habib Ait Addi

Organization: Ecole Nationale des Sciences Appliquées of Agadir. He was awarded a PhD degree in Corrosion field in 1999. He is lecturer professor, his researcher is in the Laboratoire d'Ingénierie des procédés de l'Energie et de l'environnement (LIPEE). He is expert in the pesticide field. Education: Ecole Nationale des Sciences Appliquées Agadir, Diplome d'habilitation (2005), Université Mohamed Premier, Faculté des Sciences d'Oujda, PhD degree in Chemistry Sciences (1997-1999). Université Mohamed Premier, Faculté des Sciences d'Oujda, Diplôme d'Etude Supérieures in Chemistry Sciences (1994-1997).

Experience: Ecole Nationale des Sciences Appliquées d'Agadir, Lecturer professor (2005 - to date). Ecole Superieure de Technologie d'Agadir, Asistant professor (2001-2005). Ministère de l'Agriculture, Etablissement Autonome de Contrôle et de Coordination des Exportations; Chef of laboratory (2000-2001). Ministère de l'Agriculture, Etablissement Autonome de Contrôle et de Coordination des Exportations; Responsible of laboratory (1997-2000).

Main range of scientific interests: The research interest covers as well corrosion inhibition of aluminium, lead, tin and tinplate in industrial water by oxoanions, tetrazole, pyrazole and aminoacid and ester compounds as pesticide degradation in water, soil, fruits and vegetables. Pubications: More than 30 papers in corrosion and pesticide.

Organization: University of Mohammed 1st Faculty of Science Oujda. He was awarded a PhD degree in Corrosion Science in 1994. He is currently a professor and the Director of the Laboratory of Applied Chemistry and Environment.

Education: University of Mohammed 1st Faculty of Science Oujda, Faculty of Science, Ph.D. degree

in corrosion (1994). Ecole Normale Supérieure Rabat, Doctorat (DES), 1987.

Experience: University of Mohammed 1st Faculty of Science Oujda Professor B (2003 - to date).

University of Mohammed 1st Faculty of Science Oujda, Professor A (1999-2003).

University of Mohammed 1st, Faculty of Science Oujda, lecturer Professor (1994-1998). University of

Mohammed 1st Faculty of Science Oujda, Assistant Professor (1988-1994).

Main range of scientific interests: Prof. Hammouti's research interest covers acidity sensors and corrosion inhibition of iron, steel, lead, aluminium and copper in mineral acids by tetrazole, pyrazole, polymer, thiophene, pyridine, peptide, aminoacid and ester compounds. Additionally his research interest is moreover directed towards the field of the pesticides and selective electrodes. Pubications: More than 100 papers in corrosion and sensors fields.

Organization: Faculty of Science Agadir Morocco. She was awarded a PhD degree in Corrosion Science in 2005. She is currently a teacher and researcher in the Laboratory of Materials & Environment.

Education: University Ibn Zohr, Faculty of Science, PhD degree in corrosion (2005). University Ibn Zohr, Faculty of Science, Doctorat (DES), 1994.

Experience: University Ibn Zohr, Faculty of Science Agadir, lecturer Professor (2005 - to date). University Ibn Zohr, Faculty of Science Agadir, Assistant Professor B (2003-2005). University Ibn Zohr, Faculty of Science Agadir, Assistant Professor A (1995-2003).

Main range of scientific interests: The research interest covers as well corrosion inhibition of aluminium, lead, tin and tinplate in industrial water by oxoanions, tetrazole, pyrazole and aminoacid and ester compounds as pesticide degradation in water, soil, fruits and vegetables. Pubications: More than 12 papers in corrosion.

Organization: Ecole Supérieure de Technologie of Agadir. He was awarded a PhD degree in

Corrosion Science in 2005. He is currently an assistant professor.

Education: University Ibn Zohr, Faculty of Science, PhD degree in corrosion (2005).

Experience: Ecole Superieure de Technologie d'Agadir, Asistant professor (2006 - to date).

Ministère de l'Agriculture, Etablissement Autonome de Contrôle et de Coordination des Exportations;

Chef of laboratory (2001-2006). Ministère de l'Agriculture, Etablissement Autonome de Contrôle et

de Coordination des Exportations (1995-2001).

Main range of scientific interests: The research interest covers corrosion inhibition of tin and tinplate in industrial water by oxoanions, tetrazole, pyrazole and aminoacid and ester compounds, pesticide persistence and the dissipation of their residues in water, soil, fruits and vegetables and chemical quality of the industrial wastewater. Pubications: More than 16 papers in corrosion and pesticide.

Introduction

Numerous investigations have been performed on the corrosion inhibition of copper and its alloys by the use of different organic compounds [1-9]. Among the practical interest of these later are the chemical bond that linked

the inhibitors and the metal. Therefore, the organic inhibitors provide often an excellent protection against corrosion phenomenon. This protection was explained by the presence of heteroatoms (S, N, P, Se) in the molecular structure of the inhibitors [8-12].

International Scientific Journal for Alternative Energy and Ecology № 6 (62) 2008

© Scientific Technical Centre «TATA», 2008

The addition of an inhibitor at certain concentration minimises the direct interaction between the metal and corrosive agents. In some cases, the coordination of the inhibitor molecules to the surface is weak, and their presence in the corrosive solutions required maintaining the desired concentration of these agents to attain a minimal protection of the metal [10-13]. As some inhibitor molecules also serve as reducing agents for the copper oxidation products, they must be continuously added to avoid other possible type of corrosion [14]. In the last few decades, numerous investigations were performed by using the traditional electrochemical methods [15-17], but recently, many research groups try to understand processes taking place at electrode surfaces by using in situ different accelerated corrosion techniques coupled by surface sensitive techniques like quartz crystal microbalance (QCM) and scanning probe microscopy (SPM) [18-22]. These in situ

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