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Journal of Dispersion Science and Technology Volume 36, 2015 - Issue 7
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Original Article

Some Pyrimidine Derivatives as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid

K. R. AnsariDepartment of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi, India
,
SudheerDepartment of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi, India
,
Ambrish SinghDepartment of Chemistry, Lovely Faculty of Technology and Sciences, Lovely Professional University, Phagwara, India
&
M. A. QuraishiDepartment of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi, IndiaCorrespondence[email protected] [email protected]
Pages 908-917 | Received 18 Jun 2014, Accepted 22 Jun 2014, Published online: 18 Feb 2015
 
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Abstract

The inhibition effect of four pyrimidine derivatives (PPDs) on the corrosion of mild steel in hydrochloric acid medium has been investigated using gravimetric measurements, electrochemical impedance spectroscopy, potentiodynamic polarization, and energy dispersive x-ray spectroscopy (EDX) techniques. Electrochemical impedance spectroscopy (EIS) data showed that the addition of PPDs increases the charge-transfer resistance (Rct) and decreases the double-layer capacitance (Cdl). Potentiodynamic polarization revealed that PPDs acted as mixed-type inhibitors but are predominantly cathodic. The adsorption of studied compounds obeyed the Langmuir's adsorption isotherm. EDX and quantum chemical calculations support the experimental results.

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