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Green corrosion inhibitor: A comparative study

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Abstract

A comparative study of the inhibitory effect of various parts of the plant Mimusaps Elangi (ME) extract (leaves, fruits, barks, seeds) on the corrosion of mild steel in 1 N HCl medium was investigated using weight loss method, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The polarization studies revealed that the plants extract act as mixed type inhibitor. It was found from the weight loss method that the inhibition efficiency of ME extracts increase in concentration dependents manner which was also supported by the results of electrochemical techniques. On comparison, maximum inhibition efficiency was found in ME leaves extracts with 98.50% at 20 ppm concentration. The SEM morphology of the adsorbed protective film on the mild steel surface has confirmed the high performance of inhibitive effect of the plant extract. Surface coverage values were tested graphically for suitable adsorption. Temperature studies revealed decrease in inhibition efficiency with increase temperature which suggests physisorption mechanism.

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Abbreviations

CR:

Corrosion rate

ppm:

Parts per million

Cdl:

Double layer capacitance

Rct:

Charge transfer resistance

Ecorr:

Corrosion potential

icorr:

Current density

θ:

Surface coverage area

ba:

Anodic Tafel slope

bc:

Cathodic Tafel slope

z′:

Real part

z″:

Imaginary part

g:

Gram

cm:

Centimeter

w:

Weight

%:

Percentage

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  1. PG & Research Department of Chemistry, Government Arts College (Autonomous), Coimbatore, TN, India

    P R Sivakumar & A P Srikanth

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  1. P R Sivakumar
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  2. A P Srikanth
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Sivakumar, P.R., Srikanth, A.P. Green corrosion inhibitor: A comparative study. Sādhanā 45, 56 (2020). https://doi.org/10.1007/s12046-020-1283-x

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