Inhibition of C-steel Corrosion by Green Tea Extract in Hydrochloric Solution
International Journal of Electrochemical Science, ISSN: 1452-3981, Vol: 12, Issue: 4, Page: 3283-3295
2017
- 41Citations
- 37Captures
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Article Description
Inhibition ability of green tea extract (GTE) on the C38 steel (CS) in 1.0 M HCl was evaluated using different methods such as: weight loss, electrochemical impedance spectroscopy ( EIS ) and potentiodynamic polarization ( PDP ) methods at various temperatures. Polarisation curves show that GTE acts essentially as mixed-type inhibitor controlling cathodic and anodic reactions with slight predominant in cathodic branches. EIS results indicate the increase of resistance transfer ( R t ) while double layer capacitance (C dl ) decrease in the rise of green tea extract (GTE) concentrations. Obtained results also showed that the inhibition efficiency decreased with a rise in the temperature. Activation energy ( E a ), enthalpy (Δ H a ⁎ ) and entropy and (Δ S a ⁎ ) of corrosion process were estimated using experimental measurements.
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