Chapter17 - Plant extracts as green corrosion inhibitors

Abstract

Plants acquire the ability to synthesize chemicals, called phytochemicals, in the presence of radiant energy. Extracts of different parts of plants are widely investigated as corrosion inhibitors for various atoms and their alloys. Each extract contains numerous simple to complex phytochemicals that adsorb on the metallic surface and inhibit corrosion. Adsorption of phytochemicals on the metallic surface mostly follows the Langmuir adsorption isotherm. Though in few studies, Temkin and Freundlich isotherm models have also been identified. Plant extracts as mixed-type corrosion inhibitors.