الفهرس 
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Abstract
Plant extracts (chenopodium extract,senecio extract and rosmarinus extract) have been investigated for the corrosion of copper in 1M HNO3 at different concentrations at 25±1 °C using chemical (weight loss) and electrochemical (potentiodynamic polarization, EIS and EFM) measurements. Generally, inhibition efficiency of the investigated extracts was found to depend on the concentration and the nature of the inhibitors and the results of these extracts on the copper surface obeys Langmiur’s adsorption isotherm. The effect of temperature on the corrosion behavior in presence of definite concentration of the inhibitors was studied in the temperature range (25–45°C). Also, some thermodynamic data for corrosion and adsorption processes are calculated and discussed. The results indicated that the these plant extracts could adsorb on the copper surface, the three inhibitors have excellent corrosion inhibition performance and the results obtained from chemical and electrochemical techniques are in a good agreement.