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. 2024 Oct 29;9(45):45348-45357.
doi: 10.1021/acsomega.4c07269. eCollection 2024 Nov 12.

Investigation of the Anticorrosive Activity of Piper divaricatum Essential Oil on Steel in 1 M HCl

Heloise Leal Monteiro  1 , Alcy Favacho Ribeiro  2 , Mewry Joyce Correia Modesto  2   3 , Eloisa Helena de Aguiar Andrade  3 , José Antonio da Silva Souza  4 , Jordan Del Nero  5 , Arthur de Farias Silva Rente  6 , Rodrigo Della Noce  6 , José Pio Iúdice de Souza  6 , Carlos Alberto Brito da Silva Jr  1   7 , Marcos Vinícius da Silva Paula  1 , Ana Aurea Barreto Maia  1
Affiliations

Investigation of the Anticorrosive Activity of Piper divaricatum Essential Oil on Steel in 1 M HCl

Heloise Leal Monteiro et al. ACS Omega. .

Abstract

Piper divaricatum essential oil (PDEO), extracted from plants of the Brazilian Amazon, was investigated for the first time as a novel green or eco-friendly inhibitor for steel corrosion in 1 M HCl at 25 °C. Our electrochemical studies demonstrate that for different PDEO concentrations, lower E corr and i corr values were obtained. The influence of the oil concentration on corrosion inhibition, 0.5-4 g/L, was determined for 1 and 7 days of immersion. The corrosion rate (CR) and inhibition efficiency (IE) were determined by mass loss. The steel surface in the presence and absence of oil was investigated by scanning electron microscopy (SEM). The main PDEO compounds, determined by gas chromatography-mass spectrometry (GC-MS), were methyleugenol (20.68%) and eugenol (15.42%). The CR and IE for 2 g/L PDEO exhibited an optimal value of 4.31 mm/year and 98.3% for 7 days of immersion, respectively. The surface with 2 g/L oil for 7 days exhibited a less rough morphology, which was attributed to the corrosion inhibitory effect of PDEO. In addition, the PDEO adsorption process on the steel surface obeyed the Langmuir isotherm model. Negative values found for free standard energy ( < 0 kJ·mol-1) were attributed as a favorable process, i.e., an indicative of physisorption and chemisorption between the PDEO components and the steel surface. Our results reveal that the PDEO has a promising character for anticorrosive steel applications and metal coating in industries.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Extraction of PDEO.
Figure 2
Figure 2
Polarization curves for steel in 1 M HCl after 24 h of immersion with different concentrations of PDEO.
Figure 3
Figure 3
IE of PDEO for 1 and 7 days.
Figure 4
Figure 4
CR of PDEO for 1 and 7 days.
Figure 5
Figure 5
Surface morphologies (on the left) and EDS (on the right) for steel: (a) without inhibitor and (b) with inhibitor for 7 days.
Figure 6
Figure 6
Isotherm models for the adsorption of PDEO on the steel surface in 1 M HCl for 1 and 7 days: (a) Langmuir, (b) Temkin, (c) Frumkin, and (d) Freundlich.
Figure 7
Figure 7
(a) Chemical structure of eugenol (C10H12O2), methyleugenol (C11H14O2), and their reaction sites. (b) Mechanism of inhibition of steel corrosion (Fe) in acidic media (HCl) by PDEO.
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