Performance evaluation of poly (methacrylic acid) as corrosion inhibitor in the presence of iodide ions for mild steel in H 2SO4 solution

Moses M. Solomon, Saviour A. Umoren

Research output: Journal PublicationArticlepeer-review

49 Citations (Scopus)

Abstract

The inhibition performance of poly (methacrylic acid) (PMAA) and the effect of addition of iodide ions on the inhibition efficiency for mild steel corrosion in 0.5 M H2SO4 solution were investigated in the temperature range of 303-333 K using electrochemical, weight loss, scanning electron microscopy (SEM), and water contact angles measurements. The results show that PMAA is a moderate inhibitor for mild steel in 0.5 M H2SO4 solution. Addition of small amount of KI to PMAA significantly upgraded the inhibition efficiency up to 96.7%. The adsorption properties of PMAA and PMAA + KI are estimated by considering thermodynamic and kinetic parameters. The results reveal that PMAA alone was physically adsorbed onto the mild steel surface, while comprehensive adsorption mode characterized the adsorption of PMAA + KI. Adsorption of PMAA and PMAA + KI followed Temkin adsorption isotherm. The SEM and water contact angle images confirmed the enhanced PMAA film formation on mild steel surface by iodide ions.

Original languageEnglish
Pages (from-to)1060-1080
Number of pages21
JournalJournal of Adhesion Science and Technology
Volume29
Issue number11
DOIs
Publication statusPublished - 3 Jun 2015
Externally publishedYes

Keywords

  • corrosion inhibition
  • iodide ions
  • mild steel
  • poly (methacrylic acid)
  • synergism

ASJC Scopus subject areas

  • General Chemistry
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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