Corrosion Inhibition by Green Synthesized Inhibitor: 4,4′-(1,4Phenylene)bis(6-amino-3-methyl-2,4dihydropyrano[2,3-c]pyrazole-5 carbonitrile) for Mild Steel in 0.5 M H2SO4 Solution
- 27 Downloads
The corrosion inhibition performance of the synthesized green compound namely: 4,4′-(1,4phenylene)bis(6-amino-3-methyl-2,4 dihydropyrano[2,3-c]pyrazole-5-carbonitrile) (BPP) has been tested for mild steel (MS) in 0.5 M H2SO4. Two techniques (gravimetric and electrochemical) have been utilized to evaluate the corrosion inhibition performance of BPP. The experimental results indicate that BPP shows excellent inhibition efficiency, i.e. 98% at 150 mg L− 1. Langmuir adsorption isotherm was fitted well for the adsorption of BPP molecules on MS surface. The electrochemical technique such as electrochemical impedance spectroscopy results revealed increase in charge transfer resistance in presence of BPP and polarization study indicates mixed type of inhibitor action. The surface morphology for MS with and without BPP was studied by scanning electron microscopy and atomic force microscopy which suggested corrosion retardation in the presence of BPP.
KeywordsBispyranopyrazole Mild steel (MS) Corrosion inhibition Electrochemical measurements Scanning electron microscopy (SEM) Atomic force microscopy (AFM)
Priyanka Singh is thankful to SERB-National Post Doctoral Fellowship (N-PDF), DST, India, for the financial assistance and University of Delhi for facilitation of this study.
Compliance with Ethical Standards
Conflict of interest
There is no conflict of interest.
- 12.Singh P, Singh A, Quraishi MA (2015) Thiopyrimidine derivatives as new and effective corrosion inhibitors for mild steel in hydrochloric acid: electrochemical and quantum chemical studies. J Taiwan Inst Chem Eng 60:1–14Google Scholar
- 13.Sasikumar Y, Adekunle AS, Olasunkanmi LO, Bahadur I, Baskar R, Kabanda MM, Obot IB, Ebenso EE (2015) Experimental, quantum chemical and Monte Carlo simulation studies on the corrosion inhibition of some alkyl imidazolium ionic liquids containing tetrafluoroborate anion on mild steel in acidic medium. J Mol Liq 211:105–118CrossRefGoogle Scholar
- 27.Gupta NK, Quraishi MA, Singh P, Srivastava V, Srivastava K, Verma C, Mukherjee AK (2017) Curcumine Longa: green and sustainable corrosion inhibitor for aluminum in HCl medium. Anal Bioanal Electrochem 9:245–265Google Scholar