The synergistic inhibition effect of octylmercaptopropionate and 8-quinolinol on the corrosion of iron in an aerated 0.5 M Na2SO4 solution

T. Suzuki, H. Nishihara, K. Aramaki

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The synergistic inhibition effect of sodium octylmercaptopropionate, C8H17S(CH2)2COONa (SOMP), and 8-quinolinol, C9H6NOH (Ql), on the corrosion of iron in an aerated 0.5M Na2SO4 solution was investigated by polarization measurement, X-ray photo-electron and FTIR spectroscopies and electron-probe micro-analysis. A high inhibition efficiency, 98.2%, was obtained by a mixture of 3 × 10-4 M SOMP and 5 × 10-4 M Ql. It was concluded that the high synergism of the mixture is mostly attributed to coverage of the iron surface with a precipitate layer composed of iron oxide and a chelate of Ql with Fe3+ and with a layer of Fe3+-SOMP complex precipitated at defects preferentially.

Original languageEnglish
Pages (from-to)1223-1234
Number of pages12
JournalCorrosion Science
Issue number8
Publication statusPublished - 1996 Aug



  • A. low alloy steel
  • B. EPMA
  • B. IR spectroscopy
  • B. XPS
  • B. polarization
  • C. neutral inhibition

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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