| Titre : | The inhibition effect of Gum Arabic(GA) on the corrosion of carbon steel in HCI medium |
| Auteurs : | ahmed Louafi, Auteur ; Sana Almi, Directeur de thèse |
| Type de document : | Monographie imprimée |
| Editeur : | Biskra [Algerie] : Université Mohamed Kheider, 2016 |
| Note générale : | Corrosion, chromates, toxicity, inhibitors, biodegradability, green inhibitors, Gum Arabic. |
| Langues: | Anglais |
| Résumé : | Corrosion not only has economic implications, but also social and these engage the safety and health of people either working in industries or living in nearby towns. In the past, chromates were the most commonly used inhibitive pigments. However, due to their high toxicity, many studies have been devoted to the development of more environmentally acceptable organic coatings. It is certain that natural compounds emerge out as effective inhibitors of corrosion in the coming years due to their biodegradability, easy availability and non-toxic nature. Careful perusal of the literature clearly reveals that the era of green inhibitors has already begun. In our study, we focus on the effectiveness of Gum Arabic on the corrosion of pipeline transport of oil in the center of hydrochloric acid in the presence of an oxidizing iron is to a degree of oxidation equal to three. The results show that GA is a good inhibitor in 1 M HCl. The maximum percentage inhibition efficiency was found to be 92% at 2 g/L . |
| Sommaire : |
Table Of Contents
Acknowledgments………………………………………………………………………... I Abstract…………………………………………………………………………………... II Table Of Contents……………………………………………………………………….. III List Of Figures…………………………………………………………………………… VII List Of Tables……………………………………………………………………………. X List Of Equations.……………………………………………………………………….. XI Symbols & Acronyms……………………………………………………………………. XIII General Introduction……………………………………………………………………. 1 Chapter 1: Literature Review I.1. Problem statement…………………………………………………………………... 5 I.2. Background………………………………………………………………………….. 6 I.3. The Study of Corrosion……………………………………………………………... 7 I.3.1. Corrosion Science vs. Corrosion Engineering ………………………..…… 7 I.3.2. Challenges for Today’s Corrosion Scientist………………………………... 8 I.4. Corrosion process…………………………………………………………………… 8 I.4.1. Conditions for Corrosion of Metals…………………………..……………. 9 I.4.2. Representation of Corrosion Processes and How Corrosion Occurs……….. 9 I.4.3. The Eight Forms of Corrosion……………………………………………… 10 I.5. Steel review…………………………………………………………………………. 11 I.6. Corrosion of carbon steel in acidic medium………………………………………… 11 I.6.1. The mechanism of corrosion of carbon steel in an acidic medium…………. 12 I.6.2. Kinetics of Corrosion - the Tafel Equation…………………………………. 14 I.6.2.1. Tafel straight lines………………………………………………….. 14 I.6.2.2. Faraday's Law: Quantitative survey…………………………...…… 15 I.6.3. Passivation of carbon steel………………………………………………….. 16 I.6.3.1. Passive film Development…………………………...……………... 16 I.6.4. Corrosion product of carbon steels in hydrochloric acid…………………… 18 I.6.5. Type of corrosion of carbon steel in an acidic medium…………………….. 18 I.6.6. Influence of Cl- on corrosion………………………………………………. 19 I.6.7. pH effect…………………………………………………………………….. 21 I.6.8. Influence of temperature on the corrosion………………………………….. 21 I.6.9. Influence of carbon steel microstructure……………………………………. 22 I.7. Corrosion Inhibitors…………………………………………………………………. 22 I.7.1. The corrosion inhibition of carbon steel in an acidic medium……………… 23 I.7.2. The essential properties of a corrosion inhibitor……………………………. 24 I.7.3. Mechanisms of actions of inhibitors…………………………………….… 24 I.7.4. Inhibitors classifications……………………………………………………. 25 I.7.4.1. Inorganic inhibitors…………………………………………………. 26 I.7.4.2. Organic inhibitors…………………………………………………... 29 I.8.Green Inhibitors……………………………………………………………………… 32 I.8.1.Mechanism of Action of Green Inhibitors…………………………………... 33 I.8.2.Gum Arabic………………………………………………………………….. 33 Chapter 2: Experimental setup and Equipment used II.1. Our study skills…………………………………………………………………….. 42 II.1.1. Weight loss measurements………………………………………………… 42 II.1.2. Electrochemical techniques………………………………………………. 42 II.1.2.1. Polarization curves………………………………………………… 43 II.1.2.2. Polarization resistance RP…………………………………………. 44 II.1.2.3. Cyclic voltammetry………………………………………………... 45 II.2. Experimental conditions……………………………………………………………. 45 II.2.1. Working electrodes………………………………………………………… 45 II.2.1.1. Nomenclature……………………………………………………… 45 II.2.1.2. Metallurgical review………………………………………………. 50 II.2.2. Our electrolytic medium…………………………………………………… 54 II.2.3. Electrochemical measurements……………………………………………. 54 II.2.3.1. Polarization curves………………………………………………… 55 II.2.4. The X-ray diffraction (XRD)………………………………………………. 56 II.2.5. Optical microscopy………………………………………………………… 57 Chapter 3: Results and Discussion III.1. Part 1: Study of API 5L-X60/API 5L X42 in HCl medium according to operational variables…………………………………………………………………….. 59 III.1.1.Corrosion Characterization of API 5L X60……………………………….. 59 III.1.1.1. Immersion tests…………………………………………………… 59 III.1.1.2. Electrochemical testing…………………………………………… 66 III.1.1.2.1. Cyclic voltammetry………………………………………….. 66 III.1.1.2.2. Polarization curves…………………………………………... 68 III.1.2.Influence of adding an oxidizing agent on the corrosion of API 5L X42… 70 III.2. Part 2: Evaluation of Gum Arabic against corrosion……………………………… 73 III.2.1. Characterization of the inhibitory action of Gum Arabic…………………. 73 III.2.1.1. Explanation of GA inhibition……………………………………... 73 Conclusion and perspectives…………………………………………………………... 86 References……………………………………………………………………………….. Appendix………………………………………………………………………………… |
| Type de document : | Mémoire master |
Disponibilité (1)
| Cote | Support | Localisation | Statut | Emplacement | |
|---|---|---|---|---|---|
| M/2993 | Memoire master | BIB.FAC.ST. | Empruntable | Salle de mémoires et de théses |
Erreur sur le template
