Corrosion inhibition, adsorption and thermodynamic properties of poly(vinyl alcohol-cysteine) in molar HCl
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Date
2014
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Abstract
Chemical synthesis of water soluble conducting polymer composite poly(vinyl alcoholcysteine)
[PVAC] was carried out in oxalic acid medium using ammonium persulfate. The composite
was characterized by UV, FTIR and SEM-EDX. The corrosion inhibition performance of PVAC
on mild steel in molar hydrochloric acid solution was studied by weight loss and electrochemical
methods. A maximum inhibition efficiency of 94% was observed in the presence of 0.6 wt% of
the inhibitor. The influence of inhibitor concentration, solution temperature, and immersion time
on the corrosion of mild steel has been investigated. Polarization measurements showed the mixed
type inhibitive nature of the polymer composite. The results obtained from the different methods
are in good agreement. The various kinetic and thermodynamic parameters of metal dissolution
and composite adsorption processes were evaluated from the weight loss methods in order to elaborate
the adsorption mechanism. Adsorption of inhibitor obeyed El-Awady adsorption isotherm.
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