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العنوان
Synthesis of some cationic surfactants and evaluation their corrosion inhibition performance for carbon
steel in acidic medium /
المؤلف
Salim, Mahmoud Mohamed El Sayed Mohamed.
هيئة الاعداد
باحث / محمود محمد السيد محمد سالم
مشرف / محمد مرسى عزب
مشرف / محمد عبد الرؤوف عبدالحليم
مناقش / محمد عبدالرحمن ابوريا
مناقش / ناصر محمد على البسيونى
الموضوع
Chemistry. Organic Chemistry.
تاريخ النشر
2023.
عدد الصفحات
132 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
Organic Chemistry
تاريخ الإجازة
1/1/2022
مكان الإجازة
جامعة بنها - كلية العلوم - الكيمياء
الفهرس
Only 14 pages are availabe for public view

from 154

from 154

Abstract

The corrosion of carbon steel has been widely studied due to its industrial importance in different acidic, alkaline, and salt as aggressive corrosion media. It is a natural process, which causes a huge disaster in industry and costs governments a lot of money so it’s big problem in economy of a country but we can reduce it by several methods as the environment need. This study discusses the effect of the prepared Schiff bases and cationic surfactants as corrosion inhibitors for carbon steel in 1 M HCl solution.
This work contains three chapters: -
Chapter 1: ”Introduction’’
An introduction about surfactant (definition, classification and applications) and introduction about corrosion (definition, forms and protection). A literature survey on the previous studies on the effect of Schiff base compounds and cationic surfactants as corrosion inhibitors for carbon steel in 1 M HCl solution is given.
Chapter 2: ”Materials and experimental techniques”
Experimental part includes description of synthesis of Schiff base compounds and cationic surfactants, preparation of solutions, carbon steel electrode pretreatment, weight loss measurements, and electrochemical measurements. e. g. potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), surface analysis and quantum studies.
Chapter3: “Results and discussion”
This chapter presents the results and discussion of the data obtained.
Part 1:
This part showed the procedure of synthesis and characterization of the prepared Schiff base compounds using FTIR and 1HNMR. Evaluation of the prepared Schiff base compounds as corrosion inhibitors for carbon steel in 1 M HCl using:
• Weight loss measurements
• Electrochemical impedance spectroscopy
• Potentiodynamic polarization measurements
• Surface analysis (SEM&EDX)
• Quantum studies
The data obtained from the experimental techniques showed that, the inhibition efficiency increased with inhibitor concentration increment also, the inhibition efficiency decreases with increases of temperature. from Potentiodynamic polarization measurements, the prepared Schiff base compounds acted as mixed type inhibitors. The computational investigation of prepared Schiff base compounds as corrosion inhibitors was studied using the density functional theory (DFT), Monte Carlo (MC) Simulation in gas and liquid phases. Also, the surface of carbon steel was studied using SEM and EDX analysis which confirmed the inhibition performance of the prepared Schiff base compounds in 1 M HCl. The values of activation energy (Ea), the enthalpy of activation (ΔH*) and the entropy of activation (ΔS*) were calculated. The prepared SB–OCH3 was more efficient than SB-CH3 as a corrosion inhibitor due to the presence of higher number of electron density centers such as imine, methoxy and methyl groups beside the benzene ring that increased the adsorption of SB–OCH3 which led to the covering of more surface area.
Part 2:
This part showed the procedure of synthesis and characterization of the prepared cationic surfactants using FTIR and 1HNMR. The critical micelle concentration and surface-active properties of the prepared cationic surfactants were calculated. Evaluation of the prepared surfactants as corrosion inhibitors for carbon steel in 1 M HCl using:
• Weight loss measurements
• Electrochemical impedance spectroscopy
• Potentiodynamic polarization measurements
• Surface analysis (SEM&EDX)
• Quantum studies
from the experimental techniques, the inhibition efficiency increased with inhibitor concentration increment and decreased with the temperature rising. These compounds have the ability to inhibit the corrosion rate of carbon steel in according to adsorption mechanism (formation of a surface film). The prepared cationic surfactants acted as mixed type inhibitors. The computational investigation of prepared cationic surfactants as corrosion inhibitors was studied using the density functional theory (DFT), Monte Carlo (MC) Simulation in gas and liquid phases. Also, the surface of carbon steel was studied using SEM and EDX analysis which confirmed the inhibition performance of the prepared cationic surfactants in 1 M HCl. The values of activation energy (Ea), the enthalpy of activation (ΔH*) and the entropy of activation (ΔS*) were calculated. The prepared SO12 was more efficient than S12 as a corrosion inhibitor due to the presence of higher number of electron density centers such as imine, methoxy and methyl groups beside the benzene ring that increased the adsorption of SO12 which led to the covering of more surface area.