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. Corrosion is a natural process, which causes a huge disaster in industry and costs governments a lot of money so it is a big problem in economy of a country but it could be reduced by several methods as the environment need. This work discusses the effect of some expired drugs as corrosion inhibitors for carbon steel in 1M HCl solution.
This work contains three chapters:-
Chapter 1: ”Introduction’’
An introduction about corrosion (definition, forms and protection). A literature survey on the previous studies on the effect of expired drugs as corrosion inhibitors for carbon steel in 1M HCl solution is given.
Chapter 2: ”Experimental techniques”
Experimental part includes description of chemical composition of carbon steel use and electrode pretreatment, preparation of solutions, 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:
Contains the results and discussion of Weight loss measurements for carbon steel in 1M HCl solution containing different concentrations of inhibitors at room temperature. The data revealed that, the inhibition efficiencies increased with increasing its concentration in presence of Kellagon, Dinitra and E-Mox. While in presence of G.C.Mol compound, the corrosion inhibition was decreased by increasing the inhibitor concentration.
Section 2:
Contains the results and discussion of the potentiodynamic polarization measurements for carbon steel in 1M HCl solution containing different concentrations of inhibitors at room temperature as well as the highest concentration at different temperature. The data revealed that, the drugs act as mixed type inhibitor also the inhibition efficiency increases in presence of increasing concentrations of Kellagon, Dinitra and E-Mox compounds. While in presence of G.C.Mol compound, the corrosion inhibition was decreased by increasing the inhibitor concentration. The corrosion efficiency decreased as temperature increased in presence of Dinitra compound which indicate formation of adsorptive film of physical character. On the other hand, in presence of Kellagon, E-Mox and G.C.Mol compounds, the corrosion efficiency increased as temperature was increased.
Section 3:
The values of activation energy (Ea), the enthalpy of activation (ΔH*) and the entropy of activation (ΔS*) were calculated. The adsorption isotherm for these inhibitors on carbon steel surface followed Langmuir adsorption isotherm, at room temperature.
Section 4:
Contains the results and discussion of electrochemical impedance spectroscopy (EIS) measurements for carbon steel in 1M HCl solution containing different concentrations of inhibitors at room temperature. The data revealed that, the increase of charge transfer 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) which prevent contact between metal and aggressive media.