V. Dharmalingam, P. Arockia Sahayaraj, A. John Amalraj, R. Shobana, R. Mohan, The Corrosion Inhibition Performance of Polyacrylic Acid with Potassium Sodium Tartrate and Zn2+ for Corrosion Control of Mild Steel in Aqueous Solution, Volume 61, International Letters of Chemistry, Physics and Astronomy (Volume 61)
https://www.scipress.com/ILCPA.61.137
Abstract:
    The goal of studying corrosion process is to find means of minimizing corrosion or prevent it from occurring. The use of inhibitors is one of the most popular methods for corrosion protection. A protective film has been formed on the surface of the mild steel in a neutral aqueous environment using a synergistic mixture of an eco-friendly inhibitor viz., Potassium Sodium Tartrate (SPT) along with polyacrylic acid (PAA) and Zn<sup>2+</sup> ions. The inhibiting effect of SPT, PAA and Zn<sup>2+</sup> ions have been investigated by gravimetric studies, Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The investigations revealed that SPT acts as an excellent synergist in corrosion inhibition. Optimum concentrations of all the three components of the ternary formulation are established by gravimetric studies. Potentiodynamic polarization studies inferred that this mixture functions as a cathodic inhibitor. EIS studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of mild steel. Surface characterization techniques (FTIR, SEM, AFM) are also used to ascertain the nature of the protective film. The mechanical aspect of corrosion inhibition is proposed.
Keywords:
    Corrosion, Gravimetric, Mild Steel, Polarization, Polyacrylic Acid, Protective Film