الفهرس 
Chapter I : Introduction and objectiveOnly 14 pages are availabe for public view
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Abstract
This study is based on the assessment of the role and effectiveness of certain amino acids - as friendly materials
Environment - corrosion retardants for alloy steels in an acid environment.
(ASTM A213 T which involves the study of the corrosion behavior of alloy steel (22
And used in the water circuits of power stations in Egypt in the steam concentration (0.5 Molar)
And the concentration of hydrochloric acid (0.5 Molar) and sulfuric acid (0.5 Molar) of acid
Perchloric.
It also includes a comparative study of the efficiency inhibit corrosion of this alloy in concentration (0.5 Molar)
And the concentration of hydrochloric acid (0.5 Molar) and the concentration of sulfuric acid (0.5 Molar)
Perchloric acid using different concentrations of compounds (glycine and tyrosine)
M). o 60 - and at five different temperatures ranging from (20
Been using various measurement techniques to set the rate of corrosion is: how weight loss and how
Polarisation Albotncioddinmiki (voltage difference polarized) and electrochemical impedance method
The spectral method frequency electrochemical amended (the hub) as one of the modern techniques to measure
Corrosion rate.
The results of the measurements showed the following conclusions:
1) There was a good influence for corrosion inhibition when using compounds (glycine
And tyrosine) for alloy steels in the concentration (0.5 Molar) for each of the acid
Hydrochloric and sulfuric acid, perchloric acid, where the results showed
The effectiveness of these compounds as corrosion retardants, where at least the rate of corrosion and increase efficiency
Damping increasing the concentration of inhibitor and bagasse increasing temperature.2) the efficiency of corrosion inhibition of tyrosine compound in each of hydrochloric acid and
Sulfuric and perchloric acid is greater than the efficiency of the glycine compound in every الظ t of
(Of different concentrations and temperatures).
3) The results curves polarized Albotnciodinameky for the cathode and anode that this
Working organic compounds as corrosion retardants of the dual type, where the lead
Its existence to the inhibition of both interaction Stations of cathodic الانودى of the damping due to the adsorption
These compounds on the active sites of the metal surface without a change in the reaction mechanism
Corrosion and are therefore working to form a protective layer of molecules on the surface of the damper
Ingot and cut off from the middle of acid corrosion and adsorption is physical adsorption.
4) The results were extracted using electrochemical impedance technique to process the spectral
Erosion of the alloy in sulfuric and hydrochloric acid in the absence and the presence of inhibitors
Governed by the movement of cargo and increase the concentration of inhibitors lead to increased resistance values
Which leads to (Cdl) compared to the low double layer capacity values (Rct) to move shipments
Reduce the rate of corrosion of steel alloy as a result of increasing the coverage of the surface of the metal damper for
By Ametzazh on the surface.
Generated through the use of method (Icorr) compatible with the values of the corrosion current (EFM) average
(EFM) polarization Albotnciodinameky, and electrochemical technology is frequency rate
A new way to keep track of electrochemical corrosion which is non إتلافية method for metal
And fast as it is in electrochemical impedance spectral method.
6) There was a clear consensus among all the extracted results of the four techniques
Used to set the rate of corrosion, a method of weight loss and polarization method
Albotnciodinameky and electrochemical impedance spectral method and frequency method
Electrochemical rate.7) The results of measurements extracted by electrochemical technique frequency rate
Compatible with those resulting from other electrochemical methods, which assumes the technical capacity v echoed
To measure the rate of corrosion for alloy steels in the concentration (0.5 (EFM) electrochemical rate
Molar) and the concentration of hydrochloric acid (0.5 Molar) and the concentration of sulfuric acid
0.5 Molar) of perchloric acid using different concentrations of compounds)
(Glycine and tyrosine) and at different temperatures, and then it can be used the way
In the appointment of the corrosion rate for this technique mm Z Zat (EFM) the electrochemical average frequency
That it had technical non اتلافية in addition to the test done in a short time, which makes this method
Cathodic (Tafel) perfect set disincentives efficiency without prior knowledge of the slope of the lines
And anodizing.
8) has been set functions of thermodynamics activity of the corrosion process in the absence and the presence of a damper T.
That have been studied using the coefficients corrosion process temperatures at five and six
Concentrations of each inhibitor technically four ways, has shown the values of these functions high
Activation energy and heat content in the presence of these inhibitors and the greater focus Proving
High efficiency protection for vehicles (glycine and tyrosine), these results also showed that
Activation entropy change in the presence of these inhibitors have high negative values and as an indicator of that are as
Adsorption of these compounds and be stable and predictable layer on the surface of a steel alloy.
9) has been set some الثرموديناميكية functions of the adsorption process and gave the results obtained
Relatively low indication that the physical adsorption of the type, (Kads) for the adsorption equilibrium
, (-40kJmol-negative and less than (1 (o
? G ads) as well as values change came free energy of adsorption
As an indication of negative adsorption of these (o
? H ads) values change came enthalpy of adsorption
Vehicles on the steel surface and adsorbed of the physical type, also showed this
Results show that the adsorption entropy change her negative values and high as an indicator that there is adsorption of these
Vehicles replace adsorbed water molecules and be stable and predictable layer on the surface of the alloy
Steel.) Mechanical damping compounds (glycine and tyrosine) assumes a end result of adsorption
These compounds on the surface of the alloy steel, the difference may be due between Altthbt efficiency
Between glycine and tyrosine to the difference in shape and installation الجزئيي for them, and increase
Inhibition efficiency to تيروسين him in the case of glycine in both acid
Hydrochloric, sulfuric and perchloric could be due to the existence of a
Vinyl compound Tyrosine.
11) The images obtained through a scanning electron microscope
Curves, as well as X-rays to confirm and correspond with the results extracted from the
Chemical and electrochemical tests the existence of adsorption of compounds (glycine
And tyrosine) on the surface of the steel alloy used acids.
12) study الآنودي behavior of alloy steel in different concentrations of acid
Perchloric by Filtamitri technique rotor in the absence and presence of each of the
Vehicles (glycine and tyrosine), experiments have shown that curves
Polarization الآنودي the summit featuring زوبان آنودي active layer, followed by inert
Access to effort escalated oxygen. The cathodic polarization curves
Featuring top class cathode as a result of the reduction inert gas before mounting
Hydrogen.
13) Increasing the concentration of perchloric acid to increase the maximum current for anodizing summit as
Displaces the maximum effort to the top of the negative trend, suggesting that DNA increases
Rate soluble active الآنودي.
14) composition of inactivity due to the presence of a layer of iron oxide on the surface of the anode.
15) noted that the maximum current of the summit anodizing increases with the rate of polarization and that the relationship
Stream between the maximum and the square root of the polarization rate a straight line relationship is going through a period
Originally suggesting that interactions governed Summit spread.