Alkaloids from Plant Extracts as Corrosion Inhibitors for Metal Alloys

Abstract

Plant extracts are used as corrosion inhibitors in various industrial applications. They can be employed as active compounds with corrosion inhibiting properties as they often contain natural compounds, such as alkaloids, polyphenols, flavonoids, tannins, and terpenes. They can be utilized in the formation of a protective film, in which active compounds extracted from plants can form a protective film on the metal surface, thus preventing corrosion by isolating the metal from the corrosive environment. They can also exhibit specific inhibitory action, where certain compounds extracted from plants can react specifically with metal ions released during the corrosion process, thus forming stable complexes that delay or prevent corrosion. Plant extracts are often perceived as more environmentally friendly alternatives to synthetic corrosion inhibitors, as they are generally biodegradable and nontoxic. Plant extracts can be used in industries, such as the petroleum industry, food industry, and drinking water production, where corrosion can cause significant damage. However, it should be noted that the effectiveness of plant extracts as corrosion inhibitors may vary depending on various factors, such as the chemical composition of the extract, concentration, metal substrate, and environmental conditions. Comprehensive studies are required to assess their effectiveness in specific applications.