Abstract
Inhibition efficiency of an aqueous extract of soapnut (Sapindus Trifoliatus) and Zn2+in controlling corrosion of mild steel in well water at room temperature has been evaluated by using weight loss method, polarization study and AC impedance spectra. Dynamic light scattering and Vickers hardness have also been employed. Weight loss method reveals that the formulation consisting of 10 ml soapnut extract and 50 ppm Zn2+ has 97 % inhibition efficiency in controlling corrosion of mild steel immersed in well water. Synergism parameters suggest that a synergistic effect exists between soapnut extract and Zn2+. Adsorption isotherm of metal surface obeys Langmuir adsorption isotherm. Polarization study reveals that the inhibitor system functions as anodic type of inhibitor. AC impedance spectra confirm the protective film formed on the metal surface. Dynamic light scattering (DLS) study reveals surface is in nano meter scale. The Vickers hardness of metal surface was increases in inhibitor system.
Highlights
Mild steel ( known as plain carbon steel) is a widely used material in the fabrication of heating and cooling water system in many industries [1,2,3]
Mild steel is a widely used material in the fabrication of heating and cooling water system in many industries [1,2,3]
The AC impedance spectra of mild steel immersed in well water in the absence and presence of inhibitor [soapnut extract - Zn2+] are shown in Figure7. (Nyquist plots), Figures 8a and 8b (Bode plots)
Summary
Mild steel ( known as plain carbon steel) is a widely used material in the fabrication of heating and cooling water system in many industries [1,2,3]. To evaluate the corrosion resistance of mild steel in well water, in presence of an green corrosion inhibitor soapnut extract (sapindus trifoliatus). The soapnut (SN) extract used as corrosion inhibitor in the present study.
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