Acetyl thiourea chitosan as an eco-friendly inhibitor for mild steel in sulphuric acid medium

Acetyl thiourea chitosan polymer (ATUCS) has been synthesized and evaluated as corrosion inhibitor. The electrochemical behavior of mild steel in naturally aerated 0.5 M H 2SO 4 acid containing different concentrations of ATUCS has been studied by potentiodynamic polarization, electrochemical impeda...

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Bibliographic Details
Published in:Electrochimica acta 2010-02, Vol.55 (6), p.1933-1939
Main Authors: Fekry, A.M., Mohamed, Riham R.
Format: Article
Language:English
Subjects:
Acetyl thiourea chitosan polymer
Applied sciences
Carbon steels
Corrosion
Corrosion inhibitors
Corrosion prevention
Corrosion rate
EIS
Electrochemical impedance spectroscopy
Exact sciences and technology
Immersion
Inhibition
Metals. Metallurgy
Polarization
Scanning electron microscopy
SEM
Steel
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Summary:Acetyl thiourea chitosan polymer (ATUCS) has been synthesized and evaluated as corrosion inhibitor. The electrochemical behavior of mild steel in naturally aerated 0.5 M H 2SO 4 acid containing different concentrations of ATUCS has been studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) measurements and surface examination via scanning electron microscope (SEM) technique. The results of EIS showed that the resistance ( R t) increases slightly with increasing immersion time indicating a slight decrease in corrosion rate of the steel with time. Also, the corrosion rate increases with either increasing temperature or decreasing the polymer concentration as observed by polarization technique. Electrochemical impedance spectroscopy measurements under open-circuit conditions confirmed well polarization results. ATUCS has shown very good inhibition efficiency (IE) in 0.5 M sulphuric acid solution reaches to 94.5% for 0.76 mM concentration. IE of this compound has been found to vary with the concentration of the polymer solution, immersion time and temperature.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2009.11.011