Abstract
Abstract: Application of inhibitors to prevent corrosion is a widely accepted form of protection as it is one of the easily available methods. In recent years the usage of natural products as corrosion inhibitors is gaining momentum due to environmental considerations. Extract of zygophyllum qatarense was investigated as corrosion inhibitor of mild steel in 1M HCl using conventional weight loss, electrochemical polarizations and electrochemical impedance spectroscopy. The weight loss results showed that the extract of zygophyllum qatarense is excellent corrosion inhibitor. Electrochemical polarizations data revealed the mixed mode of inhibition. The results of electrochemical impedance spectroscopy shows that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. The effectiveness of inhibition increases with the concentration of inhibitor reached to 88.16% at 3 g / L in 1M HCl medium .
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