Corrosion Inhibition Efficiency of Polyvinylpyrrolidone-Cysteine on Mild Steel in 1.0 M HCl Solution

Craig K. Nsakabwebwe, Mamookho E. Makhatha, George M. Tsoeunyane, Akinsanya D. Baruwa

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In this work, the inhibitive capability of Cysteine-doped Polyvinylpyrrolidone (PVPC) in 1.0 M HCl solution was investigated using mild steel as the reference material. To elucidate the effect of concentration on the corrosion inhibition efficiency, the synthesized PVPC via solution polymerization method was added to the acidic solution at different optimized concentrations of 25, 100, 300, 500, and 700 ppm and were characterized. Fourier-transformed infrared (FTIR), X-ray diffractometer (XRD), and scanning electron microscope equipped with energy dispersive spectroscopy (SEM/EDX) were used to study the bonding, phase formation, morphology, and elemental composition of the polymeric surface, while gravimetric analysis techniques were used to determine the corrosion rate. The C–H functional group dominance in the FTIR spectra indicated adequate surface adsorption of PVPC. It further reflected that cysteine concentration does not affect the molecular bond and intrinsic characteristics. The XRD pattern of PVPC showed mixed amorphous and crystalline structures because of different characteristics of Polyvinylpyrrolidone and Cysteine. The SEM/EDX analysis indicated that the increase in concentration caused changes in the composites' surface morphologies and resultant chemical compositions. It, however, displayed the maximum inhibition efficiency of 97% at 700 ppm. From the Langmuir isotherm model, kinetic and thermodynamic values suggested that both competitive physisorption and chemisorption processes occurred. However, physisorption was established as the predominant phenomenon during the physicochemical adsorption mechanism.

Original languageEnglish
Article number48
JournalJournal of Bio- and Tribo-Corrosion
Volume8
Issue number2
DOIs
Publication statusPublished - Jun 2022

Keywords

  • Concentration
  • Cysteine
  • Inhibition efficiency
  • Mild steel
  • Polyvinylpyrrolidone

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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