Plant extracts as environmentally sustainable corrosion inhibitors II

Corrosion control of metals is an important activity of technical, economic, environmental, and aesthetical growth. Plant extracts have traditionally emerged as eco-friendly, readily available, renewable and cost-effective substitutes for pre-existing toxic chemical corrosion inhibitors. Availability of various functional groups of phytochemicals such as alkaloids, lipids, phenolic acids, saponin, quercetin, terpenoids, and other compounds actively participate in the adsorption process on the metallic surface in the presence of a corrosive environment to function as corrosion inhibitors. This chapter aims is to delineate the potential of plant extracts, gums, essential oils to inhibit the corrosion on different metal surface. The effects of temperature, concentration on the corrosion behavior of metals in corrosive environment with the addition of extracts, were also studied. Additionally, the inhibition potential of these green corrosion inhibitors, including the techniques used to evaluate them and the relative inhibition mechanisms, are discussed. Finally, a critical analysis is addressed together with the outlook as regards future progressions. © 2022 Elsevier Inc. All rights reserved.