| Titre : | Protection against corrosion of API 5L X70 carbon steel intended to petroleum industry by green inhibitor: SchinusMolle Resin as an eco-friendly inhibitor |
| Auteurs : | Hicham Taoui, Auteur ; Abdelouahad CHALA, Directeur de thèse |
| Type de document : | Monographie imprimée |
| Editeur : | Biskra [Algerie] : Université Mohamed Kheider, 2020 |
| Langues: | Français |
| Mots-clés: | Eco-friendly inhibitor,bark resin of Shinus molle,API 5L X70 steel,electrochemical techniques,SEM,acid |
| Résumé : |
Corrosion inhibitors used in the petroleum industry are characterized as toxic, carcinogenic, and expensive
materials in addition to the difficulty of their decomposition after use. Currently, studies in this field are focused on finding alternatives characterized by: non toxicity, biodegradability, low price and availability from renewable sources. All these properties are available in natural organic compounds. Therefore, a study was conducted about the inhibition efficiency of the Bark Resin of Shinus Molle (BRSM) as an API 5L X70 steel corrosion inhibitor in hydrochloric acid and sulfuric acid by using electrochemical techniques and surface analysis (SEM). Also, the synergetic effect between the iodine ion (KI) and the inhibitor (BRSM) has been studied. The results show that the inhibitor acts as a mixed inhibitor with an inhibition efficiency of 94% in the hydrochloric acid and 70% in the sulfuric acid medium. The adsorption of BRSM inhibitor on steel surface follows Langmuir isotherm adsorption. The surface analysis results also show a high inhibition efficiency of the bark resin of Shinus molle on the steel surface (API 5L X70).Therefore, there is a great agreement between the results of electrochemical techniques and the results of surface analysis. |
| Sommaire : |
DEDICATION............................................................................................................................................I
Acknowledgement...................................................................................................................................... II List of Tables..................................................................................................................................................IV List of Figures................................................................................................................................................VI List of Equations............................................................................................................................................X List of Abbreviations................................................................................................................................XI General Introduction.................................................................................................................................1 Chapter I : Introduction and review of literature ................................................................4 I.1. Acidification.....................................................................................................................................5 I.1.1. Formation Type and Reaction with Acids:......................................................7 I.1.2. Stages of acidizing:...................................................................................................8 I.1.3. Conventional acid systems: ...............................................................................10 I.2. Carbon Steel Corrosion in Acidic Medium: ......................................................................10 I.2.1. Corrosion Mechanism in Acidic Medium: ....................................................11 I.3. Corrosion Inhibitors of Carbon Steel in Acidic Medium:............................................12 I.3.1. Inorganic Inhibitors: ............................................................................................12 I.3.2. Organic Inhibitors:................................................................................................12 I.4. The Use of organic Inhibitors in Acidic Medium:..........................................................14 I.5. Polymer as Inhibitor: ................................................................................................................17 I.5.1. Examples of inhibition with polymer ............................................................18 I.6. Synergistic Effect of Halide Ions on the Corrosion Inhibition: ................................19 I.7. Conclusion......................................................................................................................................20 Chapter II : Experimental Techniques....................................................................................... 21 II.1. Techniques of studies................................................................................................................22 II II.1.1. Electrochemical Methods ...................................................................................22 II.1.2. Surface analysis......................................................................................................27 II.2. Experimental Conditions:........................................................................................................28 II.2.1. Material (working electrode)............................................................................28 II.2.2. Medium (electrolyte)...........................................................................................30 II.2.3. Inhibitor ....................................................................................................................30 II.2.4. Electrochemical Methods ...................................................................................32 II.2.5. Surface analysis......................................................................................................33 Chapter III : Results and Discussion............................................................................................ 34 III.1. Part one: Studying corrosion of API 5L X70 steel in HCl and H2SO4 medium .35 III.1.1. Electrochemical techniques of API 5L X70 steel .......................................35 III.1.2. Immersion test of API 5L X70 steel in HCl and H2SO4 acid medium..44 III.2. Part two : Effect of BRSM on Inhibition Efficiency of API 5L X70 steel in 0.5M HCl acid solution................................................................................................................................. ....46 III.2.1. Fourier-transform infrared spectroscopy (FTIR) of BRSM...................46 III.2.2. Potentiodynamic polarization measurements of API 5L X70 steel in 0.5 M HCl media ................................................................................................................................47 III.2.3. Electrochemical impedance spectroscopy measurements of API 5L X70 steel in 0.5 M HCl media......................................................................................................49 III.2.4. Adsorption isotherm and standard adsorption free energy.................56 III.2.5. SEM-EDX analysis..................................................................................................58 III.3. Part three: Synergistic effect of Iodide ions and BRSM for the corrosion inhibition of API 5L X70 steel in 0.5M HCl..................................................................................63 III.3.1. Potentiodynamic polarization measurements of API 5L X70 steel in 0.5M HCl in presence of BRSM and KI ....................................................................................63 III III.3.2. Electrochemical impedance spectroscopy measurements of API 5L X70 steel in 0.5 M HCl media in presence of BRSM and KI.............................................65 III.3.3. Adsorption isotherm and standard adsorption free energy.................69 III.3.4. SEM-EDX analysis..................................................................................................71 III.4. Part four: Effect of BRSM on Inhibition Efficiency of API 5L X70 steel in 5% HCl as a real cas .....................................................................................................................................73 III.4.1. Potentiodynamic polarization measurements of API 5L X70 steel in 5%HCl ...................................................................................................................................................74 III.4.2. Electrochemical impedance spectroscopy measurements of API 5L X70 steel in 5% HCl..........................................................................................................................76 III.4.3. Adsorption isotherm and standard adsorption free energy.................80 III.4.4. SEM analysis of the API 5L X70 steel immersion in 5% HCl acid medium with and without BRSM ...............................................................................................81 III.5. Part five: Effect of BRSM on Inhibition Efficiency of API 5L X70 steel in 0.5M H2SO4 acid solution................................................................................................................................83 III.5.1. Potentiodynamic polarization measurements of API 5L X70 steel in 0.5 M H2SO4 media ...........................................................................................................................84 III.5.2. Electrochemical impedance spectroscopy measurements of API 5L X70 steel in 0.5 M H2SO4 media .................................................................................................86 III.5.3. Adsorption isotherm and standard adsorption free energy.................91 III.5.4. SEM analysis of the API 5L X70 steel immersion in H2SO4 acid medium with and without BRSM. ...............................................................................................93 III.6. Explanation for the inhibition of BRSM............................................................................95 General Conclusion.................................................................................................................................. 98 References ....................................................................................................................................................102 Annexes ..........................................................................................................................................................113 |
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| Cote | Support | Localisation | Statut | Emplacement | |
|---|---|---|---|---|---|
| TH/1047 | Thèse de doctorat | BIB.FAC.ST. | Empruntable |
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