oa South African Journal of Chemistry - Inhibitor for the corrosion of mild steel in HSO : research article

Volume 62, Issue 1
  • ISSN : 0379-4350



An extract of fruits was investigated as a corrosion inhibitor of mild steel in 0.5 M HSO by means of conventional mass loss, electrochemical polarization, electrochemical impedance spectroscopy and scanning electron microscopy. The mass loss results showed that the extract of is an excellent corrosion inhibitor, electrochemical polarization data revealed the mixed mode of inhibition and the results of electrochemical impedance spectroscopy showed that the change in the impedance parameters, charge transfer resistance and double layer capacitance with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. Scanning electron microscopic studies provided confirmatory evidence of an improved surface condition, due to adsorption, for corrosion protection.

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