Novel cost-effective aqueous Amorphophallus paeoniifolius leaves extract as a green corrosion inhibitor for mild steel corrosion in hydrochloric acid medium: A detailed experimental and surface characterization studies

doi:10.1016/j.cdc.2021.100734

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Volume 34, August 2021, 100734

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Abstract

Corrosion resistance property of eco-friendly Amorphophallus paeoniifolius leaves (APL) extract on mild steel surface in 1 M hydrochloric acid solution was studied by chemical, electrochemical and surface characterization methods. The functional groups and compositions of pure APL extract and corrosion product were investigated by FT-IR and UV–visible spectroscopy. Experimental methods proved the extent of metal surface deterioration in acidic medium was diminished as the APL extract concentrations increased. Corrosion inhibition mechanism is suggested to be a mixed type based on results obtained by polarization measurements. The data obtained by electrochemical impedance spectroscopic method indicates the development of protective film around the metal surface. Surface morphological studies such as FESEM, contact angle measurements and AFM studies performed on mild steel surfaces further confirm the protective ability of the inhibitor towards corrosion. It was well supported by EDAX studies indicating restricted anodic dissolution reaction in the presence of inhibitor. Adsorption isotherms showed a good fit to Langmuir isotherm and the data obtained indicates the spontaneous adsorption with the majority being physisorption. Thermodynamic and activation parameters showed the efficacy of inhibitor in controlling the corrosion and the efficiency of corrosion inhibition was found to be inversely proportional to the solution temperature. Percentage corrosion inhibition efficiency (92.49) obtained by electrochemical impedance spectroscopy on mild steel for 10% v/v concentration of APL extract was in good agreement with other experimental methods.

Graphical abstract

Section snippets

Rationale

Corrosion can be defined as a spontaneous process of metal destruction when it reacts with its surrounding atmosphere. Addition of certain compounds capable of adsorption on the electron sink areas of the metal sample will decrease the exchange current density for metal dissolution reaction [1]. Such compounds referred to as inhibitors and their addition to a corrosive medium is a feasible and efficient way of protecting metallic structure from corrosive reaction. Removal of undesirable scale

Test specimen

The mild steel samples needed for the current study was procured locally. These mild steel sheets were manually cut into coupons having dimensions 4 × 2 cm having composition (wt%) 0.133% C, 0.0061% P, 0.82% Mn, 0.08% Cr and reminder being Fe. We had used different grit numbers (220, 600, 1000, 1500, and 2000) of silicon carbide paper to abrade these metal coupons. These coupons were cleaned thoroughly using double distilled water, degreased with acetone, dried and then stored in a dessicator

FT-IR results

FTIR spectra for pure APL extract and the corroded sample is shown in Fig. 2. FT-IR spectrum of pure APL extract shows the presence of a few well known functional groups. However, the corrosion product spectrum after the metal immersion in the optimum inhibitor concentrations has shown either the peaks became less prominent or disappeared. It is due to the adsorption of such functional groups on the metal surface. The spectrum of pure extract shows a single broad peak at 3350 cm⁻¹, indicating

Conclusions

The mild steel corrosion inhibiting capacity of APL extract was investigated in 1 M HCl media. From weight loss study results, inhibitor concentration was optimized to 10% v/v. EIS measurement results confirm the mild steel corrosion inhibition because APL extract adsorption on its exterior, resulting in a protective layer. It is well supported by the negative values of ΔG^o_ads, indicating spontaneous inhibitor adsorption on the metal surface. Lower hydrophilic nature and higher surface

Declaration of Competing Interest

The authors declare that they have no conflict of interest.

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Citation Excerpt :
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Data ArticleNovel cost-effective aqueous Amorphophallus paeoniifolius leaves extract as a green corrosion inhibitor for mild steel corrosion in hydrochloric acid medium: A detailed experimental and surface characterization studies

Abstract

Graphical abstract

Section snippets

Rationale

Test specimen

FT-IR results

Conclusions

Declaration of Competing Interest

Mater. Chem. Phys.

Corros. Sci.

Carbohydr. Polym.

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Appl. Surf. Sci.

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Data Article
Novel cost-effective aqueous Amorphophallus paeoniifolius leaves extract as a green corrosion inhibitor for mild steel corrosion in hydrochloric acid medium: A detailed experimental and surface characterization studies