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Acta Metallurgica Sinica (English Letters)

, Volume 27, Issue 1, pp 37–46 | Cite as

RETRACTED ARTICLE: Experimental and Quantum Studies on Adsorption and Corrosion Inhibition Effect on Mild Steel in Hydrochloric Acid by Thiophene Derivatives

  • M. YadavEmail author
  • Debasis Behera
  • R. R. Sinha
  • P. N. Yadav
Article

Abstract

The inhibition effect of synthesized diethyl 3,4-bis(4-methoxybenzylideneamino) thieno[2,3-b] thiophene-2,5-dicarboxylate (Inh I) and diethyl 3,4-bis(benzylideneamino) thieno[2,3-b] thiophene-2,5-dicarboxylate (Inh II), on corrosion of mild steel in 15% HCl solution was investigated using weight loss measurements, electrochemical polarization, and electrochemical impedance spectroscopy techniques. The experimental results show that the inhibition efficiency of studied inhibitors increased with the increase of inhibitors concentration but decreased with the increase of temperature. Corrosion inhibition efficiencies of 94.5% and 92.1% were obtained with 250 ppm of Inh I and Inh II at 303 K, respectively. The potentiodynamic polarization measurements indicate that the studied inhibitors act as mixed inhibitor. The thermodynamic parameters of the corrosion and adsorption processes were calculated and evaluated. The adsorption of these inhibitors was found to obey Langmuir adsorption isotherm. Scanning electron microscopy was used to characterize the surface morphology of the mild steel specimens in presence and absence of inhibitors. The mechanism of the inhibition process was discussed in the light of the chemical structure and quantum-chemical calculations of the investigated inhibitors.

Key words

Mild steel Corrosion Polarization EIS Acid inhibition 

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Copyright information

© The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • M. Yadav
    • 1
    Email author
  • Debasis Behera
    • 1
  • R. R. Sinha
    • 1
  • P. N. Yadav
    • 2
  1. 1.Department of Applied ChemistryIndian School of MinesDhanbadIndia
  2. 2.Department of PhysicsPost Graduate CollegeGhazipurIndia

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