An overview on plant extracts as environmental sustainable and green corrosion inhibitors for metals and alloys in aggressive corrosive media

Corrosion inhibition on mild steel in 1 M HCl solution byCryptocarya nigraextracts and three of its constituents (alkaloids)

“…Acidic media which are widely used in industrial acid cleaning, acid descaling, and acid pickling require the use of corrosion inhibitors to restrain corrosion on metallic materials. 2 The synthetic organic and inorganic corrosion inhibitors are effective but are harmful to humans and the environment. Hence, the study of corrosion prevention particularly on mild steel using plant-based corrosion inhibitors is of tremendous interest as plant extracts are found in abundance, inexpensive, less or nontoxic, biodegradable and biocompatible.…”

“…3 Over the years, considerable efforts have been focused in nding suitable green corrosion inhibitors of organic origin such as tea leaves, 4 Hibiscus sabdariffa, 5 Musa paradisiaca, 6 Justicia gendarussa, 7 Uncaria gambir, 8 Rollinia occidentalis, 9 Glycyrrhia glabra extract, 10 Citrus aurantifolia, 11 Neolamarckia cadamba, 12 and Rhizophora apiculate. 13 The most important feature of an extract to behave as an efficient acid inhibitor is to contain organic compounds with oxygen, nitrogen, sulphur and/or phosphorus in their structures as described by Chigondo et al 14 and Verma et al 2 in their recent review articles. Their extent of inhibition depends on the effective organic groups attached and increases in the order: oxygen < nitrogen < sulphur < phosphorus.…”

Inclusion of 5-Mercapto-1-Phenyl-Tetrazole into β-Cyclodextrin for Entrapment in Silane Coatings: An Improvement in Bronze Corrosion Protection

“…In this research, the effective formation and the stability of a complex between β-CD and 5-mercapto-1-phenyl-tetrazole (MPT) ( Figure 1) were assessed. Among non-toxic corrosion inhibitors [24][25][26], MPT was chosen because of its outstanding inhibiting properties towards copper and bronze corrosion [27][28][29]. Its complex with β-CD was incorporated in a 3-mercapto-propyltrimethoxy-silane (PropS-SH) coating, and the protectiveness of the obtained coating was assessed on bronze during both immersions in concentrated acid rain and exposures to alternated acid rain spray.…”

Oil palm empty fruit bunch extract and powder as an eco‐friendly corrosion inhibitor for mild steel: A comparison study

“…Corrosion inhibitor is a promising method of protection towards acid corrosion due to its capability of adsorbing onto the metal surface to form a protective film. The use of traditional corrosion inhibitors is now limited because of increasing ecological consciousness and growing concern towards the environment . As of now, organic inhibitors, also known as green inhibitors, are the best substitute for conventional corrosion inhibitors due to their economic advantage and high efficiency.…”