Calotropis Procera plant extract as green corrosion inhibitor for 304 stainless steel in hydrochloric acid solution

Authors

  • Heba M. Ramadan El-Mansoura University, Department of Chemistry, Faculty of Science, El-Mansoura, Egypt Author
  • Hossiany Ahmed A. El Delta Fertilizers Company, Talkha, Egypt Author

DOI:

https://doi.org/10.5937/ZasMat1704541F

Keywords:

corrosion inhibition, 304 SS, HCl, WL, PP, EIS, EFM

Abstract

The effect of Calotropis Procera (CP) extract on the corrosion inhibition of 304 stainless steel (SS) in 2 M HCl was studied using electrochemical (electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PP) and electrochemical frequency modulation (EFM) and chemical weight loss (WL) methods at 25ºC. The adsorption of the extract on 304 SS surface is consistent with Langmuir adsorption isotherm. The polarization plots revealed that the addition of extract shifts the cathodic and anodic branches towards lower currents. Such shifts indicate that CP extract acts as a mixed-type inhibitor. The thermodynamic parameters of activation and adsorption processes were calculated and discussed. The surface morphology of the 304 SS specimens was evaluating using different techniques.

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Published

15-12-2017

Issue

Vol. 58 No. 4 (2017)

Section

Articles