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http://dx.doi.org/10.5012/jkcs.2014.58.2.160

Electrochemical Adsorption Properties and Inhibition of Zinc Corrosion by Two Chromones in Sulfuric Acid Solutions  

Fouda, Abd El-Aziz S. (Department of Chemistry, Faculty of Science, El-Mansoura University)
Nazeer, Ahmed Abdel (Electrochemistry and Corrosion Lab., National Research Centre)
Saber, Ahmed (Department of Chemistry, Faculty of Science, El-Mansoura University)
Publication Information
Journal of the Korean Chemical Society / v.58, no.2, 2014 , pp. 160-168 More about this Journal
Abstract
The electrochemical behavior and corrosion inhibition of zinc in 0.5 M $H_2SO_4$ in the absence and presence of some chromones has been investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The presence of these investigated compounds in the corrosive solutions decrease the weight loss, the corrosion current density, and double layer capacitance but increases the charge transfer resistance. Polarization studies were carried out at room temperature, and showed that all the studied compounds act as mixed type inhibitors with a slight predominance of cathodic character. The effect of temperature on corrosion inhibition has been studied and the thermodynamic activation and adsorption parameters were determined and discussed. The adsorption of the investigated compounds on zinc was found to obey Langmuir adsorption isotherm.
Keywords
Corrosion inhibition; Zinc; $H_2SO_4$; EIS; EFM;
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