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Cinnamaldehyde as a Green Inhibitor in Mitigating AISI 1015 Carbon Steel Corrosion in HCl

  • S. M. Zakir Hossain
  • A. Al-Shater
  • S. A. Kareem
  • A. Salman
  • R. A. Ali
  • H. Ezuber
  • M. M. Hossain
  • S. A. RazzakEmail author
Research Article - Chemical Engineering
  • 19 Downloads

Abstract

This communication reports the inhibitive attributes of cinnamaldehyde mitigating corrosion of AISI 1015 carbon steel in HCl (10% w/w) medium. The mild steel coupons were exposed in HCl medium with and without the presence of cinnamaldehyde. Following the exposure, the samples were analyzed for weight loss, potentiodynamic polarization responses, and postmortem surface characterization. The optimal cinnamaldehyde dose and inhibition efficiency were found to be 200 ppm and 95.36%, respectively. The inhibition was assumed to be mainly due to the adsorption of cinnamaldehyde on the metal surface, which followed the Langmuir isotherm. The temperature effects (25–\(85\,{^{\circ }}\hbox {C}\)) data suggested that the binding affinity of cinnamaldehyde on the metal surface was strong. The moderate rise of inhibition efficiency was associated with the chemical adsorption. The value of activation energy \((E_{\mathrm{a}})\) obtained was found to be lower than that the value obtained in the inhibitor-free HCl solution. The polarization measurements showed that the inhibitor was virtually mixed type with reduction of cathodic and anodic current densities. The inhibition efficiency, calculated from weight loss and potentiodynamic polarization, was found to be in good agreement with the literature. Scanning electron microscope observations confirmed the existence of a protective adsorbed film of the inhibitor on the metal surface.

Keywords

Cinnamaldehyde Mild steel Adsorption Corrosion Corrosion inhibition Essential oil 

List of Symbols

CR

The corrosion rate

\(E_{w}\%\)

Inhibition efficiency

\(\Delta m\)

The difference of the specimen weight before and after immersion in the test solution

D

Metal density \((\hbox {g}/\hbox {cm}^{3})\)

h

Exposure time (h)

A

The area of the mild steel specimen \((\hbox {cm}^{2})\)

\(W_{\mathrm{corr}}\)

Weight losses for steel in the presence of the inhibitor in HCl solution

\(W_{\mathrm{corr}}^{\circ }\)

Weight losses for steel in the absence of the inhibitor in HCl solution

R

The gas constant

T

The absolute temperature (K)

A

The pre-exponential factor (\(\hbox {mg}/\hbox {cm}^{2}\,\hbox {h}\))

h

Plank’s constant (\(6.626 \times 10^{-34}\, \hbox {J s}\))

N

Avogadro’s number (\(6.022 \times 10^{23}\,\hbox { units}\))

\(E_\mathrm{a}\)

Activation energy for corrosion process (kJ/mol)

\(\Delta H_\mathrm{a}^*\)

The enthalpy of activation (kJ/mol)

\(\Delta S_\mathrm{a}^*\)

The entropy of activation (J/mol.K)

\(\theta \)

The degree of surface coverage

K

The adsorption–desorption equilibrium constant

\(C_\mathrm{inh}\)

The concentration of inhibitor

g

The adsorbate parameter

\(E_{\mathrm{i}}\%\)

Inhibition efficiency

\(j_{\mathrm{corr}}\)

Uninhibited corrosion current densities

\(j'_{\mathrm{corr}}\)

Inhibited corrosion current densities

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Notes

Acknowledgements

Authors would like to gratefully acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science and Technology Unit at King Fahd University of Petroleum and Minerals (KFUPM) for funding this work through project No. NSTIP # 13-WAT096-04 as part of the National Science, Technology and Innovation Plan. Authors also like to gratefully acknowledge the support provided by Deanship of Scientific Research, University of Bahrain, Kingdom of Bahrain.

Supplementary material

13369_2019_3793_MOESM1_ESM.docx (12 kb)
Supplementary material 1 (docx 11 KB)

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Copyright information

© King Fahd University of Petroleum & Minerals 2019

Authors and Affiliations

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

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