Work deliberated here intended to study protection of sulfamic acid (NH2SO3H) induced corrosion of zinc using a biopolymer Bovine serum albumin (BSA). The efficacy of BSA was studied by potentiodynamic polarization measurements (PDP) and electrochemical impedance spectroscopy (EIS). Experimental parameters like concentration of NH2SO3H (0.1 M and 0.25 M), BSA (0.05–0.25 gL-1) and temperature (303 K–323 K) were varied to achieve maximum inhibition efficiency. Various adsorption isotherm models were tried and tested to understand the mode of adsorption. Adsorption of BSA was reaffirmed by surface (SEM, EDX, AFM) and spectroscopic (UV–Visible, AAS, FT-IR) studies. The inhibition efficiency increased with increased temperature, inhibitor concentration and acid concentration. A maximum of 89.1% inhibition efficiency was achieved at the concentration of 0.25 gL-1 BSA at 323 K in 0.25 M NH2SO3H. Thermodynamic calculations revealed the possibility of both physical and chemical adsorption of BSA on zinc. A suitable mechanism was predicted for the corrosion and inhibition process. BSA emerged as an excellent green inhibitor.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics