الفهرس 
ContentsOnly 14 pages are availabe for public view
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Abstract
Abstract : Corrosion is one of the problems facing the world from a long time ago, and until now, where we cannot prevent corrosion permanently, but we can reduce its risks on metals and alloys, this work discusses the corrosion of carbon steel in an acidic environment and how to protect it, where two plant extracts were used to reduce this corrosion. This study used three methods to determine the efficiency of plant extracts and their work as an inhibitor, and the first of these methods is the weight loss method. This method is used to discover the effect of temperature in inhibiting the corrosion of carbon steel at four different degrees in the range 30-45 degrees Celsius and found that the corrosion rate increases with increasing the temperature and the inhibition efficiency decrease, indicating that the inhibition occurs through physical adsorption and is subject to the Langmuir isotherm. Negative Gads values ensure that the adsorption process is spontaneous and that the adsorbed layer on the carbon steel surface is stable. Potentiodynamic polarization measurements for carbon steel were performed with and without different concentrations of the planet extract. The polarization curves showed that these inhibitors have an effect on both cathodic and anodic processes. Also, spectroscopy measurements were performed on carbon steel with and without different concentrations of the planet extract. We conclude from the impedance data the following : Rct values magnified by expulsion relationship with the concentrations of the inhibitor, confirming the magnifying effectiveness of corrosion inhibition an in acidic solutions. The percentage of EI obtained from EIS measurements is the same as percentage obtained from polarization and weight loss. AFM, SEM and EDX experiments were carried out to ensure that the examined extracts were actually adsorbed onto the surface of carbon steel. The effect of the chemical composition of plant extracts on the inhibition efficiency was discussed, and the order of the inhibition efficiencies was mainly determined by the number of active adsorption sites and molecular weight.