Effect of Cefazolin on the corrosion of mild steel in HCl solution
By Singh, Ashish Kumar & Quraishi, M.A.
Published in Corrosion Science
2010
Abstract
The adsorption and inhibition effect of Cefazolin on mild steel in 1.0 M HCl at 308–338 K was studied by weight loss, EIS, potentiodynamic polarization and atomic force microscopy techniques. The results showed that inhibition efficiency increased with inhibitor concentration. The adsorption of Cefazolin on mild steel surface obeys the Langmuir adsorption isotherm equation. Both thermodynamic (enthalpy of adsorption Δ H ads ∘, entropy of adsorption Δ S ads ∘ and free energy of adsorption Δ G ads ∘ ) and kinetic parameters (activation energy Δ E a ∘ and pre-exponential factor A) were calculated and discussed. Polarization curves showed that Cefazolin acted as mixed-type inhibitor controls predominantly cathodic reaction.