INHIBITION OF CORROSION OF CARBON STEEL IN HCl SOLUTIONS BY VARIOUS SCHIFF BASE

Evaluation of corrosion inhibitors for steel in acidic media is important for some industrial facilities as well as is very interesting from theoretical aspects. Most of the effective inhibitors are organic compounds containing nitrogen, phosphorus and sulphur in their structures [1, 2]. Heteroatoms such as nitrogen, oxygen and sulphur are capable of forming coordinate covalent bond with metal owing to their free electron pairs and thus acting as inhibitor. Compounds with π-bonds also generally exhibit good inhibitive properties due to interaction of π orbital with metal surface. Schiff bases -with RC = NR′ as general formulahave the both features combined with their structure which may then give rise to particularly potential inhibitors.