Aqueous extract of Haloxylon Scoparium Pomel as corrosion inhibitor for carbon steel in hydrochloric acid medium

摘要

Corrosion affects most of the industrial sector and may cost billions of dollars each year for preventing, replacement and maintenance. The use of inhibitors is one of the most effective ways to prevent corrosion. However, there is increasing concern about the toxicity of most corrosion inhibitors. The toxic effect does not only affect living organisms but also poisons the environment Plant extract have become important because are biodegradable and environment friendly. They are the rich sources of ingredients which have very high inhibition efficiency. The inhibition of the corrosion of carbon steel in hydrochloric acid solutions by the extract of Haloxylon Scoparium Pommel has been studied using gravimetric and electrochemical measurement. Inhibition was found to increase with increasing concentration of the inhibitor. Values of inhibition efficiency calculated from weight loss and potentiodynamic polarization are in good agreement. This value goes up to 90%. Polarization curves reveal that Haloxylon Scoparium Pomel act as cathodic inhibitor. The results obtained showed that the extract of Haloxylon Scoparium Pomel could serve as an effective inhibitor of the corrosion of carbon steel in hydrochloric acid media. The adsorption of the extract on the carbon steel surface obeys the Langmuir adsorption isotherm.