A review on ammonia derivatives as corrosion inhibitors for metals and alloys

Nowadays, metallic corrosion is one of the most challenging and damaging phenomena that is associated with huge economic and safety losses. The corrosion damages become more severe during some industrial cleaning processes where metallic materials are allowed for their surface treatment for their further processing and applications. Therefore, corrosion inhibitors, mostly organic compounds are employed during these processes. Most of the investigated inhibitors are associated with salient features, including the presence of heteroatoms (N, S, O, P, etc.) and aliphatic chains and aromatic rings. Generally, organic inhibitors adsorb and form defensive film that isolates the metal(s) from surrounding corrosive environment and protect from corrosion. Literature survey reveals that ammonia derivatives are highly used in almost all kinds of electrolytic media. Aliphatic and aromatic amines, amino acids, hydrazine and phenylhydrazine and their derivatives are most frequently used ammonia derivatives as corrosion inhibitors. Present chapter dealing with the collection of few major reports available on the topic “ammonia derivatives as corrosion inhibitors.” Amino acids (AAs) can also be regarded as mono-substituted amines; therefore, present chapter also includes literature available on AAs as corrosion inhibitors.