Corrosion Inhibition of mild steel in aqueous solution containing H₂S by some naturally occurring substances

Abstract

The corrosion inhibition of mild steel by some naturally occuring substance was evaluated in absence and presence of 600 and 1200 mg H,S/I in 3% NaCI aqueous solution and pH of 3 and ternperature of 25 "C. These naturally occurring substance included the water extracts, coumarines and fatty matters extracts of some Egyptian plants. These plants included: 1) Nigella Sativa (Family Ranunculacease) (Extract l), 2) Coriandrum Sativum (Family Umbelliferea) (Extract 11), 3) Ricinus communis (Family Euphorbiaceae) (Extract 111). The galvanostatic anodic and cathodic polarization measurements were used for studying the corrosion behavior of mild steel and evaluation of the percentage inhibition of the undertesting extracts of these three plants and also preparation of fatty matters and coumarin fractions were mentioned.

Inhibition of copper corrosion by the essential oil of Allium sativum in 0.5M H2SO4 solutions

“…According to Ajeigbe et al [17] and Barakat et al [18], plant extracts have been used for decades as effective corrosion inhibitors, their property due to their richness in complex organic compounds containing heteroatom's, aromatic rings and multiple bonds (double and triple bonds) have also been identified as adsorption centers that interact with active sites on the surface of a metal. For this reason, multiple essential oils from different plants have also been studied to prevent metal corrosion.…”

Naturally Occurring Elettaria cardamomum Extract as a Corrosion Inhibitor for the Dissolution of Zinc in 1.0 M HCl

“…Recently, plant extracts have again become important as an environmentally acceptable, readily available, and renewable source for a wide range of needed inhibitors. Plant extracts are viewed as an incredibly rich source of naturally synthesized chemical compounds that can be extracted by simple procedures with low cost [8].…”