Journal of Materials Science

, Volume 45, Issue 4, pp 979–986 | Cite as

l-Tryptophan as green corrosion inhibitor for low carbon steel in hydrochloric acid solution

  • Jia-Jun FuEmail author
  • Su-Ning Li
  • Lin-Hua Cao
  • Ying Wang
  • Lian-He Yan
  • Lu-De Lu


The inhibition behavior of low carbon steel in 1 M HCl by l-tryptophan was investigated with weight loss experiment and Tafel polarization curve in the used temperature range (298–328 K). All the experimental results show that l-tryptophan has excellent corrosion inhibition performance and the most effective concentration of inhibitor is 1 × 10−2 mol L−1. The Tafel polarization curve results indicate that l-tryptophan acts more as a cathodic than anodic inhibitor. The adsorption of l-tryptophan on the surface of low carbon steel obeys the Langmuir adsorption isotherm, and the thermodynamic parameters were determined and discussed. The adsorption behavior of l-tryptophan at Fe surface (1 1 0) was also investigated by the molecule dynamics simulation method and density functional theory. The results indicated that the l-tryptophan could adsorb firmly on the Fe surface through the indole ring with π-electrons and nitrogen/oxygen atom with lone-pair electrons in its molecule.


Corrosion Rate Inhibition Efficiency Corrosion Current Density Weight Loss Measurement Indole Ring 


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Jia-Jun Fu
    • 1
    Email author
  • Su-Ning Li
    • 1
  • Lin-Hua Cao
    • 1
  • Ying Wang
    • 1
  • Lian-He Yan
    • 1
  • Lu-De Lu
    • 1
  1. 1.School of Chemical EngineeringNanjing University of Science and TechnologyNanjingChina

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