Corrosion of steel in environment is an unavoidable but a preventable process. One of the practical methods for controlling the effect of corrosion of steel especially in environments is by using corrosion inhibitors which are contained mainly of organic or inorganic substances. However, the toxic nature of organic and inorganic inhibitors of corrosion to the environment has forced the enquire for harmless corrosion inhibitors called ‘green corrosion’ inhibitor due to their personal effects like non-toxicity, biodegradability, cheap and easily available. The applying natural plant extracts as environmentally safe corrosion inhibitor for steel has in recent times received enormous attention by researcher scholars. Extracts of plant contains polar atoms such as S, N, O, P etc. Due to this nature, the lone pair of electrons present on these atoms is adsorbed on to the metal surface; loss of electrons from the metal surface can be prevented. Thus corrosion inhibition takes place. This approach has aided in understanding the component of the plant extracts responsible for imparting the inhibition effect. This review paper presents an overview of works published on natural green plant extracts as corrosion green inhibitor for preventing corrosion
