Sodium lignosulfonate as a friendly-environment corrosion inhibitor for zinc metal in acidic media

The corrosion inhibition property of sodium lignosulfonate is investigated by three different independent monitoring techniques. These methods include weight loss measurements, electrical conductance and potentiodynamic polarization. Solutions with and without sodium lignosulfonate in 0.01 M HCl and 0.1 M HCl were prepared at 20 o C to study the influence of sodium lignosulfonate on the corrosion of zinc sheets. The results obtained from the three different methods indicate the protection role of sodium lignosulfonate, which is considered as a friendly-environment corrosion inhibitor, in the corrosion of zinc sheets. The reduction of the zinc corrosion in solutions with HCl and different concentrations of sodium lignosulfonate using potentiodynamic polarization followed the order: 30 mM > 10 mM > 5 mM >1 mM. The obtained results from weight loss, potentiodynamic polarization and electrical conductance experiments were in good agreement with each other.