The protection mechanism offered by Heterophragma adenophyllum extract against Fe-C steel dissolution at low pH: Computational, statistical and electrochemical investigations

Priti Pahuja; Nisha Saini; Bhaskaran; Abdelkarim Chaouiki; Rachid Salghi; Sumit Kumar; Suman Lata

doi:10.1016/j.bioelechem.2019.107400

The protection mechanism offered by Heterophragma adenophyllum extract against Fe-C steel dissolution at low pH: Computational, statistical and electrochemical investigations

Bioelectrochemistry. 2020 Apr:132:107400. doi: 10.1016/j.bioelechem.2019.107400. Epub 2019 Nov 27.

Authors

Priti Pahuja¹, Nisha Saini¹, Bhaskaran², Abdelkarim Chaouiki³, Rachid Salghi³, Sumit Kumar¹, Suman Lata⁴

Affiliations

¹ Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, Haryana, India.
² Department of Chemistry, University of Delhi, Delhi India.
³ Department of Process Engineering and Environment, ENSA, University Ibn Zohr, Agadir, Morocco.
⁴ Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, Haryana, India. Electronic address: sumanjakhar.chem@dcrustm.org.

PMID: 31812875
DOI: 10.1016/j.bioelechem.2019.107400

Abstract

An ethanolic extract of Heterophragma adenophyllum (HA) was investigated as a corrosion inhibitor for Fe-C steel in hydrochloric acid. The inhibition effect of the HA extract was examined using weight deterioration, electrochemical impedance spectroscopy (EIS) and polarization techniques. EIS showed enhanced charge transfer resistance with a maximum protection value of ~96% at 600 ppm concentration. Tafel extrapolation results revealed that corrosion was restricted by mixed inhibition. The i_corr values reduced considerably from 53.63 μA cm^-2 at 100 ppm to 20.11 μA cm^-2 at 600 ppm of HA extract. Interaction intensity was further examined through Langmuir, Freundlich, D-R, Frumkin, and Flory-Huggins adsorption isotherms. The computational study, statistical modelling and surface morphology by XPS, AFM, and SEM-EDX, indicated an excellent adsorption capability of HA on Fe-C steel.

Keywords: Adsorptive isotherms; Computational modelling; Fe-C steel corrosion; Heterophragma adenophyllum; Statistical modelling.

MeSH terms

Adsorption
Bignoniaceae / metabolism*
Carbon / chemistry*
Computer Simulation*
Electrochemical Techniques / methods*
Hydrogen-Ion Concentration*
Iron / chemistry*
Microscopy, Atomic Force
Microscopy, Electron, Scanning
Molecular Dynamics Simulation
Solubility
Spectrum Analysis / methods
Surface Properties

Substances

Carbon
Iron