الفهرس 
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Abstract
The present work was devoted to Corrosion studies on carbon steel in aqueous solutions by using organic compounds containing N,O and S atoms 5-(arylidene barbituric acid devrivates) in 1 M HCl on the corrosion of C-steel has been examined via weight loss (WL) method, potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM) techniques. The attained outcomes exhibit that the investigated compound is excellent inhibitor and its inhibition efficiency (%IE) rises by rising concentration and temperature. The adsorption of the investigated derivative on the surface of C-steel follows Langmuir isotherm. The adsorption process of the investigated compound is spontaneous and considered as chemisorption type. PP curves revealed that the studied derivative is mixed-type inhibitor. Moreover, EIS results confirmed the adsorption of the investigated compound on C-steel surface via increasing on charge transfer resistance (Rct) and lowering in capacitance of double layer (Cdl). The IE% of the investigated derivative reached to 92.8% at concentration 21×10-6 M according to WL method. All tested methods gave good agreement.