الفهرس 
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Abstract
The present work is assigned to study the effect of chemical and mechanical factors on the corrosion performance of cupronickel alloys in polluted salt water using open circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), stress corrosion cracking (SCC), scanning electron microscopy (SEM) and EDX measurements. The obtained results showed that the inhibition efficiency of these compounds increased by increasing their concentration and decreased by raising the temperature, so that the adsorption of these compounds is physical adsorption and follow Langmiur isotherm. The inhibition efficiencies also increased by addition of potassium iodide. Some thermodynamic parameters are computed and discussed. The influence of chemical structure of the used amino acids on their inhibition efficiencies was discussed. Agreement among the different independent techniques indicates the validity of the obtained results.