Organic green corrosion inhibitors (OGCIs): a critical review

Abstract

Over the decades, corrosion has resulted in loss of lives accorded with damage costs in almost all engineering fields. Thus, it is seen as an environmental threat with catastrophic attributes, which calls for day-to-day research on its final resolution. Recent studies have proven organic green corrosion inhibitors (OGCIs) from plant extracts with biodegradable, environmentally accommodative, relatively cheap, and nonharmful features as the most perfect approach of tackling the problem. This review gives succinct discussion on the mechanisms, classifications, and active functional groups of OGCIs. Measuring ways and factors influencing their efficiency are presented. Also, various plant extracts used as OGCIs in preventing material corrosion in corrosive media coupled with their respective findings, applied characterization techniques, and future challenges are presented. The significance of values obtained from simulating presented mathematical models governing OGCI kinetics, adsorption isotherm, and adsorption thermodynamics is also included. In conclusion, recommendations that will broaden the usage of OGCIs from plant extracts for inhibiting corrosion of materials are presented for prospective researchers in the field of corrosion.

Corrosion inhibiting effect of a green formulation based on Opuntia Dillenii seed oil for iron in acid rain solution

“…According to literature, value around -20 kJ/mol or less negative implies an electrostatic interaction between charged inhibitor molecules and charged metal surface which called physisorption. While those around -40 kJ/mol or more negative involve charge sharing or transfer from inhibitor molecules to metal surface to enhance the formation of a coordinate covalent bonds which is named chemisorption [ 31 , 41 ]. From Table 9 , the negative values of the magnitudes indicate the spontaneous adsorption of the inhibitor on the iron surface.…”

“…From Table 9 , the negative values of the magnitudes indicate the spontaneous adsorption of the inhibitor on the iron surface. In addition, the values lie between -20 and -40 kJ/mol (-25.218 kJ/mol for PPC and -25.568 kJ/mol for EIS), which likely mean that the plausible inhibition mechanism of FOD was explained by both physical and chemical forces [ 41 ].…”

Synergistic effect of potassium iodide and sodium dodecyl sulfonate on the corrosion inhibition of carbon steel in HCl medium: a combined experimental and theoretical investigation

“…1 There is extensive literature indicating that the use of corrosion inhibitors is an important approach to inhibit metal corrosion. [2][3][4] Generally, organic molecules containing hetero atoms (O, S, N), unsaturated bonds, p-electrons or polar functional groups can be expected to be excellent corrosion inhibitors. [5][6][7] Many compounds such as plant extracts, drugs, and synthetic organic molecules have been proven to have good corrosion inhibition effects.…”

Electrospun Al2O3 Film as Inhibiting Corrosion Interlayer of Anode for Solid Aluminum–Air Batteries

“…For the electrolyte, the researchers have found that adding additives (including organic [21,28], inorganic [29] and hybrid inhibitors [30]) helps to make the electrolyte less corrosive. It is generally recognized that the inhibitor molecules act by adsorbing on the metal surface to form a protecting film, which would lead to a decrease in corrosion rate [31,32]. To better tune the Al/electrolyte interface, surface modifications on Al anode have been reported to suppress the corrosion.…”