Eco-Friendly Roselle (Hibiscus Sabdariffa) Leaf Extract as Naturally Corrosion Inhibitor for Cu-Zn Alloy in 1M HNO3

Document Type : Original Article

Authors

1 Department of Chemistry, Faculty of Science (Girls), Al-Azhar University, P.O. Box: 11754, Yousef Abbas Str., Nasr City, Cairo, Egypt

2 Physical Chemistry department, NRC, Dokki, Giza, Egypt.

3 Department of chemistry, Faculty of Science(Girls), Al-Azhar University.P.O.Box:11754, Yousef Abbas Str.,Nasr city,Cairo, Egypt

Abstract

The eco-friendly compounds especially plant extracts have emerged as green corrosion inhibitors for metals and alloys. The inhibiting impact of Roselle extract on Cu-Zn alloy in 1M HNO3 solution was studied by weight loss, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). It was found that Roselle extract acts as a good mixed-type corrosion inhibitor for Cu-Zn alloy in acid solution. The corrosion rate decreases with increasing the extract concentration and increases with raising the temperature. The formation of a protecting film on the Cu-Zn alloy surface with the presence of Roselle extract was confirmed by scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX). The high inhibition efficiency of 94.89 % was recorded for 80% extract solution. There are good agreements between the results from all techniques.

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History

  • Receive Date: 27 August 2021
  • Revise Date: 19 September 2021
  • Accept Date: 20 October 2021

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