Abstract
Abstract Corrosion is a spontaneous process that adversely affects strength and quality of economically vital materials including steel. Plant extracts are emerging as renewable, low cost and eco-friendly alternate to existing toxic chemical corrosion inhibitors. Physisorption, Chemisorption and retrodonation are the main mechanism of corrosion inhibition by plant extracts. Different functional groups of phytochemicals namely carbohydrate, lipids, terpenoids, phenolic acids, alkaloids and other nitrogen containing metabolites participate in physisorption, chemisorption and retrodonation with steel surface in presence of HCl and H2SO4 to act as corrosion inhibitors. Exact mechanism of inhibition depends upon presence of such phytochemical in the plant extracts.
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