The current research work deals with the alkaline electroless Ni-B plating of mild steel in the presence of Azadirachta indica gum (GAI). The deposited Ni-B film on mild steel surface was analyzed using FT-IR and Scanning Electron Microscope (SEM) techniques. The amorphous nature of Ni-B deposits on mild steel was confirmed by XRD. The amount of Nickel and Boron content on deposited Ni-B film on mild steel surface was investigated by Energy Dispersive X-ray Analysis (EDX).
The mild steel dissolution in 1 N HCl medium was monitored in the presence and absence of gum exudates of Eucalyptus globles (GEG) using quantitative gravimetric method at 303-323 K. The synergistic influence of iodide ions with GEG on the dissolution of mild steel was also studied at 303-323 K. The impedance (Rct and Cdl) and polarization (ba, bc, icorr, Ecorr) parameters were obtained from electrochemical methods for the optimum concentration of GEG and GEG + I–. The dissolution of mild steel decreases with increase in the concentration of GEG and GEG + I– at 30 °C. But their inhibition ability of tested inhibitor system for dissolution control of mild steel decreases with increase in temperature but rate of dissolution of mild steel is comparatively less in the case of GEG + I–. Adsorption of GEG on mild steel obeys Langmuir’s isotherm and supports physisorption process. Tafel’s parameters confirm the mixed nature of the studied inhibitor.
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