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 H 2 SO 4 to act as corrosion inhibitors. Exact mechanism of inhibition depends upon presence of such phytochemical in the plant extracts.

中文翻译：

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植物化学物质作为钢腐蚀抑制剂：机理研究

腐蚀是一个自发过程，会对包括钢在内的经济重要材料的强度和质量产生不利影响。植物提取物正在以可再生，低成本和环保的形式出现，替代现有的有毒化学腐蚀抑制剂。物理吸附，化学吸附和还原反应是植物提取物抑制腐蚀的主要机理。在HCl和H 2 SO 4的存在下，植物化学物质的不同官能团（即碳水化合物，脂质，萜类化合物，酚酸，生物碱和其他含氮代谢物）参与钢表面的物理吸附，化学吸附和还原，以充当腐蚀抑制剂。确切的抑制机制取决于植物提取物中此类植物化学物质的存在。