Cornus Sanguinea Leaves Alcoholic Extract As Corrosion Inhibitor For Carbon Steel In Acidic Solutions

In recent years finding environmentally friendly and affordable sources to mitigate corrosion has become demanding in many industries due to the increased awareness related to environmental issues. Due to their readily availability, biodegradability, low toxicity and relatively low cost, plant extracts have been shown to be an effective alternative for corrosion protection of different metals in various environments. This work reports on the performance of the alcoholic extract of Cornus sanguinea leaves (CSL) as a green corrosion inhibitor for carbon steel immersed in 1 M HCl solution. Weight loss and potentiodynamic polarization techniques have been used to investigate the corrosion rate of the carbon steel samples immersed in the 1 M HCl solution with and without the addition of various concentrations of the CSL alcoholic extract. The addition of 250 mg/L CSL alcoholic extract resulted in the highest corrosion inhibition efficiency (i.e. 91.68%) at 25 ºC. The polarization curves showed that the CSL alcoholic extract acts as a mixed-type inhibitor. A significant decrease of the corrosion inhibition efficiency of the CSL alcoholic extract was observed when increasing the temperature in the range 25–55 ºC.