Asian Journal of Research in Chemistry

Khaled Mansouri ¹, Naima Hellali ², Oumelkheir Rahim ³, Ahmed Tabchouch ⁴

Affiliations
1 Lab. Mathematics and Applied Science, Ghardaïa University BP 455 Ghardaïa, Algeria., IN
2 Faculty of Sciences and Technology, Department of Process Engineering, Ghardaïa University, BP 455 47000 Ghardaïa, Algeria., IN
3 Electrochemical Laboratory, Chemistry Department, Faculty of Mathematics and Matter Sciences University Kasdi Merbah, Ouargla 30000, Algeria., IN
4 Lab. Dynamic Interactions and Reactivity of Systems, Process Engineering Department., IN

Abstract

In this work, we study the inhibitory efficacy of organometallic compounds (phosphonium salts) used as an inhibitor on the corrosion of carbon steel XC70. The compound is (methoxy methyl) triphenyl phosphonium chloride (MMTP Cl). The study was performed in a 0.5M H2SO4 media. The measurements were performed by three electrochemical methods: electrochemical impedance spectroscopy potentiodynamic polarization and gravimeter method. One of the most widely used methods of protecting metals against corrosion is the use of inhibitors. They act by adsorption on the metal surface. The effectiveness of the corrosion inhibitor has been evaluated by several methods; polarization technique (Tafel line); electrochemical impedance and mass loss spectroscopy (immersion test) in acidic media. The results have allowed us to deduce the steel corrosion rate as well as other electrochemical parameters. The overall results show that the compounds (MMTP Cl) was chemically adsorbed on the steel surface. And in this case, adsorption occurs on the surface of the metal, according to the Langmuir modelin 0.5M H2SO4 solution. And the best concentration that decreasing the corrosion rate and gives inhibitory efficacy is 1ppm (R = 74.19%). A Comparative electrochemical study with that reported in the literature revealed that the efficiency of the inhibitors follows the order: 1-butyl triphenyl phosphonium chloride> (chloromethyl) triphenyl phosphonium chloride (CTP)>tetraphenyl phosphonium chloride (TP)>triphenyl phosphine oxide (TPO) > triphenyl (phenyl methyl) phosphonium chloride (TPM). It was also reported in the literature that the efficiency of halide inhibitors follows the order: I-> Br->Cl->F-.

Keywords

Corrosion, Electrochemical Study, Gravimeter Study, Inhibition; (methoxy methyl) triphenyl phosphonium chloride

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Messaouda Allaoui ¹, Oumelkheir Rahim ², Djamila Hamada ³, Manel Zaoui-Djelloul Daouadji ⁴, Brahim LABED ⁵

Affiliations
1 VPRS Laboratory, Chemistry Department, Faculty of Mathematic and Matter Sciences. University of Kasdi Merbah, Ouargla 30000, Algeria, IN
2 Pollution and Waste Treatment Laboratory, Chemistry Department, Faculty of Mathematics and Matter Sciences, University Kasdi Merbah, Ouargla 30000, Algeria., IN
3 3Process Engineering Laboratory, Applied Sciences Faculty, University of Kasdi Merbah, Ouargla 30000, Algeria., IN
4 VPRS Laboratory, Chemistry Department, Faculty of Mathematic and Matter Sciences. University of KASDI Merbah, Ouargla 30000, Algeria., IN
5 Superior Normal School, Ouargla, Algeria, IN

Abstract

The Moringa oleifera (Moringaceae) is one of these important plants, distributed in many tropical and subtropical countries, known with its medical uses of high nutritional value it is called the "tree of life". The Composition profile of the dichloromethane extract of the flowers of Moringa oleifera growing in Algerian desert was studied by capillary gas chromatography-mass spectrometry (GC-MS). thirty four Compounds were identified; Within the limits of the applied experimental conditions and by interpreting the mass spectra obtained and comparing it with the mass spectra of the reference materials, we record the possibility of the presence of the following chemical compounds: Hydrocarbons, Organic acids, Esters, Aldehydes Aromatic compounds and Nitrocyclic compounds, which major compounds are : (Z) - (9,17Octadecadienal (100%), Octadecanoic acid (60.4%), Heneicosane (10.186%), (Z)-9 Octadecenoic acid (12.711%), Heptadecanoic acid (13.742%), Hexadecane, 2,6,10,14-tetramethyl (18.988%), Heptadecane (14.866%) and Eicosane (17.535%). Analysis of QSAR descriptor from the results revealed that major constituents of the dichloromethane extract of Moringa olifera (L.) flowers

Keywords

Moringa oleifera, Dichloromethane extract, flowers, GC-MS, QSAR.

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