The inhibition of mild steel corrosion by papaya and neem extracts

Abstract

This study examined earlier research on using papaya and neem extracts as inhibitors to minimize the corrosion of mild steel in a variety of corrosive situations. The potential inhibitory characteristics of plant extracts to potentially replace the hitherto used, well-known inhibitors that are harmful to the people handling them as well as the environment, inspired several scholars to conduct corrosion inhibition tests on metals using plant extracts. The findings of earlier research demonstrated that the maximal inhibitory efficiency provided by neem leaf extract to prevent the degradation of carbon steel in a hydrochloric acid (1 M) medium was 97%, while 86% was observed for the protection in H2SO4 (1 M) solution. The extract from Carica papaya leaves was shown to have up to 83% maximum inhibitory efficacy for preventing mild steel corrosion in HCl (1 M). It has been revealed that when extract concentration increased, the rate of steel corrosion reduced. Additionally, papaya leaves' corrosion-inhibiting mechanism was said to occur mostly in the cathodic area. Both plant-leaf extracts (Papaya and Neem) have been reported to have adsorption qualities that, for the most part, agreed with the Langmuir adsorption isotherm model.

Corrosion inhibition of carbon steel by eucalyptus leaves in acidic media: An overview

“…The Freundlich adsorption isotherm may be used to define an exponential energy distribution that surrounds a heterogeneous surface [48,49]. It gives a clear explanation of the relationship between the inhibitor concentration in a liquid that is in touch with a metal's surface and inhibitor concentration there.…”

“…It gives a clear explanation of the relationship between the inhibitor concentration in a liquid that is in touch with a metal's surface and inhibitor concentration there. The Freundlich adsorption isotherm model's mathematical formulation is as follows [48]:…”

“…Because it explains the interactions that take place in the adsorbed layer, the Temkin adsorption model stands out from all the other models that have been previously given. In mathematics, it is expressed as [47,48]:…”

Overview of corrosion behaviour of ceramic materials in molten salt environments

“…Paper is available on the website: www.idk.org.rs/journal In general, the menace of corrosion refers to the degradation of materials occasioned by electrochemical or chemical reactions. Unlike ceramics, metals tend to degrade in acidic environments and previous studies have shown that the corrosion of metals can be deterred in various acidic media using different plant extracts and pastes [4][5][6][7][8][9][10][11][12][13]. When exposed to acidic conditions, ceramics display improved corrosion resistance in comparison with metals [14].…”