CORROSION PROTECTION ABILITY OF POLYPYRROLE COATED MILD STEEL IN BURIED SAND

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Published: 2025-08-29
DOI: https://doi.org/10.46281/bjmsr.v10i6.2509
Keywords:
Electrodeposition, Pore Free, Inhibitor, Adherent, High Efficiency

Main Article Content

Sanjay Singh
Amrit Campus and PhD Scholar, Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal
https://orcid.org/0000-0001-9405-6889
Shova Neupane
Postdoctoral Researcher, Department of Mechanical and Electrical Engineering, University of Southern Denmark, Denmark
https://orcid.org/0000-0002-3692-5123
Nabin Karki
Associate Professor, Bhaktapur Multiple Campus, Tribhuvan University, Bhaktapur, Nepal
https://orcid.org/0000-0003-3858-776X
Dipak Kumar Gupta
Assistant Professor, Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal
https://orcid.org/0000-0001-6010-9495
Amar Prasad Yadav
Professor, Central Department of Chemistry, TU and Vice-Chancellor, Rajarshi Janak University, Janakpurdham, Nepal
https://orcid.org/0000-0002-8592-4856

Abstract

Corrosion prevention is a global issue.  One way to reduce metal corrosion is by applying polymer coatings. Corrosion prevention increasingly involves the use of polypyrrole (PPy) coatings, which significantly reduce corrosion rates and provide anodic protection.  The purpose of this study was to deposit PPy on mild steel (MS) from 0.4 M pyrrole in 0.1 M sodium potassium (Na-K tartrate) by cyclic voltammetry (CV). This study employed electrodeposition of PPy on MS by CV and explored its corrosion protection performance in the buried sand medium containing 0.1 M NaCl and 0.1 M H2SO4 by the potentiodynamic polarization (PDP) method. The results revealed that with an increase in the number of cycles, the CV showed that the PPy layer formed gradually and covered the MS surface. The oxidation peak vanished after the first cycle, and the current increased with the increasing cycles. The synthesized PPy coating was analyzed by a scanning electron microscope (SEM), which revealed a compact coating layer with cauliflower-like morphology.  It was also examined using an energy-dispersive X-ray spectrometer (EDX), which confirmed the presence of carbon, nitrogen, and oxygen elements. The open-circuit potential (OCP) remained constant over time, resulting in a stable film. The corrosion potential also showed a slight change compared to both media. The significant findings of this study were that the PPy coating behaved as a mixed inhibitor in both media, and the corrosion inhibition efficacy of the PPy coating was approximately 99% in H2SO4 and 98% in NaCl, with good adhesion.


JEL Classification Codes: L6, L69.

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Vol. 10 No. 6 (2025): Continuous Publication

Section

Research Paper/Theoretical Paper/Review Paper/Short Communication Paper
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This work is licensed under a Creative Commons Attribution 4.0 International License.

Author Biographies

Sanjay Singh, Amrit Campus and PhD Scholar, Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

Sanjay Singh is currently Ph D scholar at Central Department of Chemistry, Tribhuvan University,  Kirtipur, Kathmandu, Nepal. His areas of research interest are corrosion and electrochemistry. He has published articles in renowned international and national journals.

Shova Neupane, Postdoctoral Researcher, Department of Mechanical and Electrical Engineering, University of Southern Denmark, Denmark

Shova Neupane has expertise in Corrosion research, Bio-nanointerfaces, Biosensing, electrolytic and thin film capacitors, and state-of-the-art experimental techniques. She has published more than five dozen articles in renowned international and national journals.

Nabin Karki, Associate Professor, Bhaktapur Multiple Campus, Tribhuvan University, Bhaktapur, Nepal

Nabin Karki received PhD from Tribhuvan University, Nepal. He is an associate Professor at Bhaktapur Multiple Campus, Tribhuvan University, Bhaktapur, Nepal. His areas of research interest are corrosion, green inhibitors, and electrochemistry. He has published more than a dozen articles in renowned international and national journals.

Dipak Kumar Gupta, Assistant Professor, Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

Dipak Kumar Gupta received a PhD in chemistry from Tribhuvan University. He is an Assistant Professor at the Central Department of Chemistry, Tribhuvan University. His research areas of interest are electrochemistry, corrosion, polymer coatings, and supercapacitors. He has published extensively in many renowned international and national journals.

Amar Prasad Yadav, Professor, Central Department of Chemistry, TU and Vice-Chancellor, Rajarshi Janak University, Janakpurdham, Nepal

Amar Prasad Yadav is currently Vice-Chancellor of Rajarshi Janak University (RJU), Janakpurdham, and a Professor of Chemistry at Tribhuvan University. He received a Doctorate in engineering with a major in electrochemistry and corrosion from the Tokyo Institute of Technology, Japan, and a Post-doctorate from the same institute. He also worked as a Research Associate at the Max-Planck Institute for Iron Research, Düsseldorf, Germany. His research areas of interest are corrosion inhibitors and green coatings, electrochemical polymerization and composite coatings, atmospheric corrosion, and energy storage supercapacitors. He has published more than 100 articles in renowned international and national journals.

How to Cite

Singh, S. ., Neupane, S., Karki, N. ., Gupta, D. K., & Yadav, A. P. . (2025). CORROSION PROTECTION ABILITY OF POLYPYRROLE COATED MILD STEEL IN BURIED SAND. Bangladesh Journal of Multidisciplinary Scientific Research, 10(6), 36-45. https://doi.org/10.46281/bjmsr.v10i6.2509
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