Synergistic Inhibition of Sodium Molybdate and Sodium Silicate on Carbon Steel in KCl Media

The synergistic corrosion inhibition of of sodium molybdate and sodium silicate for mild steel in 5 % KCl solution at 25 degrees C was investigated using the conventional weight loss measurement method and potentiodynamic polarization method. The obtained results show that carbon steel can be more efficiently protected by the mixture of sodium molybdate and sodium silicate than single sodium molybdate or single sodium silicate in 5 % KCl solution at 25 degrees C. Tough the concentrations of single sodium molybdate or single sodium silicate reaches up to 1000mg/L, but their inhibition efficiencies are both under 74 %. However, when the concentration of the combined inhibitor of sodium molybdate and sodium silicate is only 200 mg/L its inhibition efficiency is still above 88 %.