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Journal of Applied Electrochemistry

, Volume 40, Issue 3, pp 631–637 | Cite as

Electrochemical corrosion behavior of Al7075 rotating disc electrode in neutral solution containing l-glutamine as a green inhibitor

  • H. Ashassi-Sorkhabi
  • E. Asghari
Original Paper

Abstract

This is a study of the electrochemical corrosion behavior of aluminum alloy Al7075 and its corrosion inhibition using l-glutamine in 3.5% NaCl solution under different hydrodynamic conditions. The hydrodynamic conditions were simulated by using a rotating disc electrode. The results showed that an increase in rotation speed leads to a higher corrosion current density, while the charge transfer resistance decreases and corrosion potential shifts toward more positive values. The inhibition efficiency depends on rotation speed. That is, the efficiency was low in stagnant solution, but enhanced significantly under hydrodynamic conditions. The phenomenon was attributed to the increased mass transport of inhibitor’s molecules to the electrode surface that is advantageous for improvement of inhibition efficiency. However, higher rotation speeds (Ω ≥ 1,500 rpm) cause a slight reduction of efficiency due to higher shear stresses.

Keywords

Hydrodynamic Corrosion Inhibition Aluminum Glutamine 

Notes

Acknowledgements

The authors would like to thank Dr. Reza Sadreddini and Er. M. Majid Azar for grammatical revision of the text, Er. M. Rahimi for preparation of Al7075 rotating disc electrodes and University of Tabriz for financial support.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Electrochemistry Research Laboratory, Physical Chemistry Department, Faculty of ChemistryUniversity of TabrizTabrizIran

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