Evaluation of chitosan and carboxymethyl cellulose as ecofriendly corrosion inhibitors for steel

Saviour A. Umoren, Abdullah A. AlAhmary, Zuhair M. Gasem, Moses M. Solomon

Research output: Journal PublicationArticlepeer-review

134 Citations (Scopus)


The study was aimed at establishing the possibility of using eco-friendly natural polymers to formulate corrosion inhibitors for sweet oil field environment. Against this background, the performance of two natural polymers; chitosan and carboxymethyl cellulose (CMC) as single component corrosion inhibitors in comparison with a commercial inhibitor formulations, on API 5L X60 pipeline steel in CO2 saturated 3.5% NaCl solution were investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques; complemented with surface morphology characterization of the corroded steel samples without and with inhibitors using scanning electron microscope (SEM). The results indicate that there is a remarkable difference in inhibition efficiency of each inhibitor on the API 5L X60 steel and the commercial inhibitor formulations. Inhibition efficiency increased with the increase of inhibitors’ concentrations. Immersion time was found to have a profound effect on the corrosion inhibition performance of all the inhibitors. Also the inhibition efficiency was found to decrease with the increase in temperature. Potentiodynamic polarization results reveal a mixed-type inhibition for all inhibitors. The adsorption of each inhibitor on the steel surface obeys Langmuir's isotherm.

Original languageEnglish
Pages (from-to)1017-1028
Number of pages12
JournalInternational Journal of Biological Macromolecules
Publication statusPublished - 1 Oct 2018
Externally publishedYes


  • Carbon steel
  • Carboxymethyl cellulose
  • Chitosan
  • Corrosion inhibitors
  • Polymers
  • Sweet corrosion

ASJC Scopus subject areas

  • Molecular Biology
  • Structural Biology
  • Biochemistry


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