A comparative study on the electrochemical behavior of mild steel in sulfamic acid solution in the presence of monomeric and gemini surfactants

M. Motamedi, A. R. Tehrani-Bagha, M. Mahdavian*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)

Abstract

The electrochemical behavior of mild steel in sulfamic acid solution in the presence of a gemini cationic surfcatant, butanediyl-1,4- bis(dodecyldimethylammonium bromide (12-4-12), and its monomeric counterpart, dodecyltrimethylammonium bromide (DTAB), was investigated as a function of the surfactant concentration by means of electrochemical impedance spectroscopy (EIS). The critical micelle concentration (cmc) values of DTAB and 12-4-12 in 1 M sulfamic acid solution, measured by surface tension measurement, were found to be 1.2 and 0.02 mM, respectively. The EIS results revealed a higher charge transfer resistance in 12-4-12 solution compared to that in DTAB solution at the same concentration normalized by the cmc (c/cmc). The morphology of the steel samples after being exposed to the acidic test solutions was examined by atomic force microscopy (AFM). The AFM micrographs showed a reduction of surface roughness in the presence of the surfactant which is more evident at higher surfactant concentrations. The adsorption of both surfactants in the sulfamic acid solution was studied by Langmuir and Flory-Huggins adsorption isotherms at submicellar concentrations.

Original languageEnglish
Pages (from-to)488-496
Number of pages9
JournalElectrochimica Acta
Volume58
Issue number1
DOIs
Publication statusPublished - 30 Dec 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Adsorption
  • Cationic surfactants
  • EIS
  • Mild steel
  • Sulfamic acid

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