Inhibitive Action of Potassium Iodide on the Corrosion of Stir-Cast Al–Si/SiC in NaCl-KI Interface

F. Asuke, M. Abdulwahab, O. S.I. Fayomi, V. S. Aigbodion, A. P.I. Popoola

Research output: Contribution to journalArticlepeer-review


The inhibitive action of potassium iodide (KI) on the corrosion of Al–Si/SiC particulate composite in 3.65% NaCl solution was investigated using gravimetric and potentiodynamic polarization techniques at 298 K. The results showed that KI in NaCl-aluminum alloy/SiC composite environment decreased the corrosion rate at all the concentrations considered. Inhibitor efficiencies (IEs) of 97.17, 97.34, and 97.57% with 0.5 g/v addition using gravimetric method were achieved after 92, 196, and 288 h of exposure times, respectively. The IEs from the potentiodynamic polarization method under both conditions (uninhibited/inhibited) were significantly enhanced. The high-resolution scanning electron microscopy for surface morphology of the as-corroded, uninhibited specimens showed the formation of pits and cracks compared with the as-corroded inhibited specimens. The addition of KI as corrosion inhibitor indicates increased potential value, % IE, and polarization resistance value with the decreasing current density. The two methods employed for the corrosion assessment of the composite were in agreement, and mixed-type corrosion has been demonstrated to occur which followed Langmuir adsorption isotherms.

Original languageEnglish
Pages (from-to)822-827
Number of pages6
JournalJournal of Failure Analysis and Prevention
Issue number6
Publication statusPublished - 1 Dec 2015
Externally publishedYes


  • Al–Si/SiC composite
  • Inhibitor efficiency
  • Interface
  • Thin film

ASJC Scopus subject areas

  • General Materials Science
  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering


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