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Electrochemical and statistical study of the inhibition effect of T. conophorum leaf extract on aluminum corrosion in acidic medium

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Abstract

This work investigated the corrosion inhibition ability of T. conophorum leaf extract (TCLE) on aluminium in a 3 mol/L HCl medium using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The effect of four process variables (acid conc., inhibitor conc., corrosion time and temperature) on the inhibition efficiency was optimized using Response Surface Methodology (RSM) techniques. The Tafel plot reveals the effectiveness of TCLE act as a mixed-type inhibitor, with relatively high inhibition efficiency (>70%). The optimal inhibition efficiency was determined at acid conc: 1.5 mol/L, inhibitor conc: 0.04 g/L, corrosion time: 4.5 h and temperature: 303 K. Analysis of variance (ANOVA) result confirmed the fitting goodness of quadratic regression model, with a models’ probability (p values), Fischer’s F-value, and lack-of-fit values of 0.0001, 15.76 and 0.999, respectively. Hence the corrosion data were well described by the quadratic model, as it presented sufficient forecasting of the optimal inhibitory conditions.

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Abbreviations

C:

Inhibitor concentration

CCD:

Central composite design

Cdl :

Non-ideal double-layer capacitance

CS:

Electrochemical workstation

Ecorr :

Corrosion potential (mV vs SCE)

fa :

Anodic interaction coefficient

fc :

Cathodic interaction coefficient and

icorr :

Corrosion current density (μA/cm2)

R2 :

Coefficient of determination

Rct :

Charge transfer resistance

Rs:

Solution resistance

RSM:

Response Surface Methodology

TCLE :

T. conophorum leaf extract

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Authors and Affiliations

  1. Department of Chemical Engineering, Nnamdi Azikiwe University, P.M.B. 5025, Awka, Nigeria

    Loveth N. Emembolu, Chukwunonso O. Aniagor, Josiah C. Umembamalu & Chukwunonso N. Onyenanu

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  1. Loveth N. Emembolu
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  2. Chukwunonso O. Aniagor
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  3. Josiah C. Umembamalu
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  4. Chukwunonso N. Onyenanu
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Correspondence to Loveth N. Emembolu or Chukwunonso O. Aniagor.

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Emembolu, L.N., Aniagor, C.O., Umembamalu, J.C. et al. Electrochemical and statistical study of the inhibition effect of T. conophorum leaf extract on aluminum corrosion in acidic medium. Saf. Extreme Environ. 3, 157–166 (2021). https://doi.org/10.1007/s42797-021-00040-2

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  • DOI: https://doi.org/10.1007/s42797-021-00040-2

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