Comparison of Inhibition and Adsorption of a Flower extract of Rumex vesicarius L. on the Corrosion of carbon steel in acid media 1 N; HCl and H2SO4

Abstract

Green corrosion inhibitors are biodegradable and free of heavy metals. Some research groups have reported the successful use of naturally occurring substances to inhibit the corrosion of metals in acidic and alkaline environments. Among the various eco-friendly inhibitors, plant extracts are becoming more and more popular. In this study, the inhibitive and adsorption properties of the flower extract of Rumex viscarius L. as corrosion inhibitors of the carbon steel XC70 in the 1N; HCl and H2SO4 medium were investigated using the weight loss method of monitoring corrosion. The significance of the corrosion inhibition in the 1N; HCl and H2SO4 medium has been discussed. The corrosion rate was found to decrease with an increase in the concentration of both inhibitors in an acidic medium. But the corrosion rates were observed to be increased in the presence of inhibitors in an HCl medium. The maximum inhibition efficiency in H2SO4 and HCl was found to be 95.58 and 91.58% with 12.5% (v/v) concentrations of the inhibitor, respectively. The adsorption mechanism between the extract and the carbon steel substrate is found to obey Langmuir and Temkin isotherms. We also studied the impact of temperature on the corrosion, with non-attendance and attendance the optimum concentration in the temperature range from 265 to 353 K.