Ultrasound and microwave heating for the synthesis of green corrosion inhibitors: a literature study

Organic compounds show excellent anticorrosion property owing to their strong ability to absorb on a metallic surface. Organic compounds, especially heterocyclic compounds, adsorb on the metallic surface and form a surface protective film that isolates the metallic structures from the corrosive environment and protects against corrosion. The heterocyclic compounds contain numerous electron-rich polar functional groups and multiple bonds through which they get adsorbed on the metallic surface. One of the common sources of these compounds is their chemical syntheses. Nevertheless, their traditional syntheses are considered to be expensive, time-consuming, tedious, and not environment-friendly, as they utilize traditional heating methods that requires minutes, hours, days, or even weeks to activate the reactant molecules. In view of this several nonconventional heating methods, including microwave (MW) and ultrasound (US) heating, have emerged as new and efficient heating sources for the synthesis of organic compounds with different industrial and biological applications, including corrosion inhibitors. Several organic compounds have been recently synthesized using MW and US irradiation and employed as effective corrosion inhibitors. This chapter describes the findings of some major works that have been published on corrosion inhibitors derived using MW and US irradiation. This chapter also deals with the advantages of MW and US heating and the disadvantages of traditional heating.