Asymmetric azo Compounds synthesis, Characterization and Study them as Corrosion Inhibitors for Carbon Steel in Acidic Medium

Document Type : Original Article

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Department of Chemistry, College of Education for pure science , University of Basrah , 61004 Basrah , Iraq

Abstract

New two azo compounds were synthesised from a coupling reaction of 3-tert-butyl-4-hydroxy anisol with 4-amino acetophenone or 4-aminobenzosulfonic acid to produce (E)-1-(4-((3-(tert-butyl)-2-hydroxy-5-methoxyphenyl)diazenyl)phenyl)ethan-1-one (1), and sodium (E)-4-((3-(tert-butyl)-2-hydroxy-5-methoxyphenyl)diazenyl)benzenesulfonate (2) . These compounds were characterized using FT-IR, 1HNMR, and mass spectroscopy. Compounds 1 and 2, were tested as inhibitors toward corrosion phenomenon of carbon steel in 1 M HCl solution based on potentiodynamic polarisation techniques and scanning electron microscopy (SEM). Show results that using high concentrations of compounds enhanced inhibitory efficiency(IE) which was reduced when the temperature was increased. Tafel polarization curves showed that corrosion rate was decreased with an increasing concentration of compounds. The values of an inhibitory efficiency (IE) were calculated by using several techniques and found that the order of IE of the inhibitors synthesized was inhibitor 2 high than inhibitor 1.

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History

  • Receive Date: 08 October 2021
  • Revise Date: 27 December 2021
  • Accept Date: 07 January 2022

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