Effects of Cinnamaldehyde as an Eco-Friendly Corrosion Inhibitor on Mild Steel in Aerated NaCl Solutions

  • S. M. Zakir HossainEmail author
  • S. A. Kareem
  • A. F. Alshater
  • H. Alzubair
  • S. A. Razzak
  • M. M. Hossain
Research Article - Chemistry


This article investigates the impact of cinnamaldehyde as an eco-friendly inhibitor in mitigating corrosion detriment on mild steel in aerated NaCl (3% w/w) using weight loss and potentiodynamic polarization methods. The results indicate moderate inhibition efficiency of cinnamaldehyde reaching around 70% at an optimum level of 0.5 g/L or 500 ppm by establishing an adsorption film on metal surface. Adsorption of the cinnamaldehyde seemed to adhere to the Langmuir isotherm. The corrosion rate decreased with cinnamaldehyde dose up to the optimum level while increased slowly with the medium temperature. The activation energy (Ea) achieved with cinnamaldehyde was found to be lower than that of without cinnamaldehyde. The polarization curves revealed that the inhibitor performs as a mixed-type inhibitor since it diminishes both anodic and cathodic current densities. The calculated inhibition efficiencies using both corrosion monitoring techniques were found to be in good agreement. Additionally, the mild steel surfaces (inhibited and uninhibited) were examined by using SEM–EDX analysis.


Cinnamaldehyde Inhibitor Mild steel Adsorption Corrosion 



The author(s) would like to acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) for funding this work through project No. DF181018. The authors also would like to gratefully acknowledge the support provided by Deanship of Scientific Research, University of Bahrain, Kingdom of Bahrain.


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Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

  1. 1.Department of Chemical EngineeringUniversity of BahrainZallaqKingdom of Bahrain
  2. 2.Department of Chemical EngineeringKing Fahd University of Petroleum and MineralsDhahranSaudi Arabia

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