الفهرس 
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Abstract
English Summary
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 work discusses the effect of amide and mono, di and tri cationic surfactants as corrosion inhibitors for carbon steel in
1M 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 cationic surfactants as corrosion inhibitors for carbon steel in
1M HCl solution is given.
Chapter 2: ”Materials and experimental techniques”
Experimental part includes description of synthesis of cationic surfactants used, preparation of solutions, carbon steel electrode pretreatment, electrolytic cell working procedures, weight loss measurements, and electrochemical measurements. e. g. potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).
Chapter3: “Results and discussion”
This chapter presents the Results and discussion of the data obtained. This chapter is divided into four sections as follows:
Section 1:
Show the procedure of synthesis of Methyl nicotinate , synthesis and characterization of N,N’- (azanediylbis (ethane -2, 1-diyl))dinicotinamide (Amide I), synthesis of cetyl -2-chloroaetate, synthesis and characterization ofN-(2-(hexadecyloxy)-2-oxoethyl)-2-(nicotinamido)-N-(2-(nicotinamido) ethyl)ethan-1-ide-1-aminium, (II), synthesis and characterization of N-(2-(hexadecyloxy)-2-oxoethyl)- N - (2- (1-(2-(hexadecyloxy)-2-oxoethyl)-1l4-pyridine-3-carboxamido)ethyl) -2- (nicotinamido)ethan -1- ide -1- aminium (III), synthesis and characterization ofN-(2-(hexadecyloxy)-2-oxoethyl)-2-(1-(2-(hexadecyloxy)-2-oxoethyl)-1l4-pyridine-3-carboxamido)-N-(2-(1-(2-(hexadecyloxy)-2-oxoethyl)-1l4-pyridine-3-carboxamido)ethyl)ethan-1-ide-1-aminium (IV) and critical micelle concentration and surface active properties :
Section 2:
Contains the result and discussion of Weight loss measurements for carbon steel in 1M HCl solution containing different concentrations of inhibitors at room temperature. The data reveals that, the inhibition efficiencies for all prepared cationic surfactants compounds increases with increasing its concentration.
Section 3:
Contains the result and discussion of Potentiodynamic polarization measurements for carbon steel in 1M HCl solution containing different concentrations of inhibitors at room temperature and the highest concentration at different temperature. The data reveals that, the prepared cationic surfactants act as mixed type inhibitor also the inhibition efficiency increased with inhibitor concentration increment and the inhibition efficiency decrease with increase of temperature using amide I and II, III and IV cationic surfactants. The values of activation energy (Ea), the enthalpy of activation (ΔH*) and the entropy of activation (ΔS*) were calculated. The adsorption of isotherm for these surfactants on carbon steel surface followed Langmuir adsorption isotherm at room temperature.
Section 4:
Contains the result and discussion of electrochemical impedance spectroscopy (EIS) measurements for carbon steel in 1 M HCl solution containing different concentrations of inhibitors at room temperature. The data reveals that, the increase of polarization resistance with increasing inhibitor concentration indicates that these compounds have the ability to inhibit the corrosion rate of carbon steel in according to adsorption mechanism (formation of a surface film).