An investigation of chloride-substituted Schiff bases as corrosion inhibitors for steel

EMREGÜL K. C., Kurtaran R., Atakol O.

Corrosion Science, vol.45, no.12, pp.2803-2817, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 12
  • Publication Date: 2003
  • Doi Number: 10.1016/s0010-938x(03)00103-3
  • Journal Name: Corrosion Science
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2803-2817
  • Keywords: steel, acid media, Schiff base, inhibitor, polarization, impedance, CRYSTAL-STRUCTURE, IRON, ACID, COPPER, MEDIA
  • Ankara University Affiliated: Yes

Abstract

Polarization and impedance measurements were performed on steel in deaerated 5% HCl solution with and without Schiff base additives within the concentration range 1 × 10-4-5 × 10-3 mol/dm3. The Schiff base compounds used were salicylaldimine, R, N -(2-chlorophenyl)salicyaldimine, 2Cl-R, N-(3-chlorophenyl)salicyaldimine, 3Cl-R, and N-(4-chlorophenyl )salicyaldimine, 4Cl-R. It was found that when the concentration of the inhibitors were increased the inhibitor efficiencies, η, also increased with increasing surface coverage. The results indicated that the ortho-substituted (2Cl-R) compound had the highest inhibition efficiency. All the Schiff base additives studied obeyed the Langmuir isotherm. © 2003 Elsevier Ltd. All rights reserved.