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Review
. 2024 Jun 27;10(14):e33748.
doi: 10.1016/j.heliyon.2024.e33748. eCollection 2024 Jul 30.

Plant extracts as green corrosion inhibitors for different kinds of steel: A review

Bhoomika R Holla  1 , R Mahesh  2 , H R Manjunath  3 , V Raghu Anjanapura  4
Affiliations
Review

Plant extracts as green corrosion inhibitors for different kinds of steel: A review

Bhoomika R Holla et al. Heliyon. .

Abstract

Corrosion significantly threatens the structural integrity of steel-based constructions like buildings and industrial units. Traditional corrosion inhibitors, such as chromates, are associated with environmental and health risks. This has led to a growing interest in environmentally sustainable alternatives, with plant extracts emerging as promising candidates. These extracts are widely available, sustainable, and eco-friendly. This review aims to explore the potential of plant extracts as corrosion inhibitors for various types of steel. After examining current scientific literature, over 40 plant extracts have been identified that exhibit corrosion inhibition properties. These extracts have been thoroughly analyzed to understand their effectiveness in preventing corrosion. The review elucidates the mechanisms by which these extracts interact with metal surfaces to form protective layers, effectively hindering the corrosion process. In this review, we focus on the challenges associated with utilizing plant extracts as inhibitors, including optimal extract concentration and temperature considerations.

Keywords: Adsorption; Adsorption isotherm; Corrosion inhibitors; Plant extracts; Steel.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Dr Anjanapura V Raghu.

Figures

Fig. 1
Fig. 1
Schematic representation of physisorption and chemisorption.
Fig. 2
Fig. 2
Molecular structure of Khasainine alkaloid [12].
Fig. 3
Fig. 3
Schematic representation of the mechanism of inhibition via interaction of alkaloid molecules with vacant d-orbitals of Fe. (MS – Mild Steel) [12].
Fig. 4
Fig. 4
(a) L-Tryptophan and (b) ferulic acid [20].
Fig. 5
Fig. 5
Structure of 4-Pyrimindinecarboxylic acid (a) and Dihydrocorynantheine(b) [38].
Fig. 6
Fig. 6
Reaction during the alkaloid test [38].
Fig. 7
Fig. 7
(a) is 2-Amino-4-oxo-3,4-dihydro-pteridine-6-carboxylic acid, (b) is (3-nitropyridin-2-ylsulfanyl)-acetic acid, (c) is (6-cyano-5-methoxycarbonylmethyl-5,6-dimethyl-2-thioxo-piperidine-3-yl)-propionic acid methyl ester and (d) is camptothecin [38].
Fig. 8
Fig. 8
Mechanism of inhibition by Camptothecin alkaloid on mild steel [39].
Fig. 9
Fig. 9
Mechanism of inhibition by adsorption of the Berberine alkaloid in mild steel [40].
Fig. 10
Fig. 10
Molecular structure of 3β-isodihydrocadambine [41].
Fig. 11
Fig. 11
Mechanism of inhibition by 3 β –iso-dihydrocadambine on mild steel [41].
Fig. 12
Fig. 12
Molecular structure of (a) Liriodenine and (b) Oxoananlobine [42].
Fig. 13
Fig. 13
Molecular structures of (1)-alkaloids N-methylisococlaurine (2) - N-methyllaurotetanine and (3)- Atherosperminine [43].
Fig. 14
Fig. 14
Mechanism of interaction of alkaloids with mild steel [43].
See this image and copyright information in PMC

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