Study of Inhibitory Effect of Walnut Leaf Extract on Corrosion of Carbon Steel in NaCl 3.5%

Assessment of corrosion inhibitors for metals in aggressive media is important for some industrial facilities. While choosing an inhibitor, several factors such as its cost, toxicity,availability and environment friendliness need to be taken into account. In spite of the high efficiency of many commonly used synthetic compounds, they are often toxic, carcinogenic or even allergenic, green inhibitors are used as corrosion inhibitors. In the present work, attentionhas been focused on the corrosion inhibiting properties of walnut leaf extract carbon steel in NaCl 3.5% environment. Walnut leaf extract contain phenolic substances that can naturally prevent the corrosion of ferrous metals. The performance of the inhibitor in different concentrations of 5%,10%, 15%, 20%, 25% and 30% of walnut leaf extract in NaCl 3.5% was studied electrochemicaly by using open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance (EIS) techniques. Observed results showed addition of walnut leaf extract to NaCl3.5% environment, led to a shift in corrosion potential and a decrease in the corrosion rate. Observed results will be presented and discussed.

کلیدواژه ها:

Inhibitor ، Walnut leaf extract ، Carbon steel ، Nacl 3.5%