Review on Azo-dyes and their corrosion Inhibitory Potentials in Aggressive Media- Experimental and Theoretical approach

Author(s) Name:

Justinah Solayide Amoko, Christopher Olumuyiwa Aboluwoye & Oluwatoba Emmanuel Oyeneyin

Abstract

In a bid to eradicate/reduce corrosion of metal parts in home appliances and industrial machines, the use of corrosion inhibitors have been employed in recent times. This is necessary in order to reduce production cost and improve productivity. This work reviewed the corrosion inhibitory capacity of azo-dyes. The review showed that most Azo-dyes are synthesized majorly by diazotisation and coupling reactions. They showed very strong inhibitory capacity owing to the presence of the azo group(s), substituent group(s) like –OH, -SH, NH₂ and the plane conjugated system of their moieties. These azo compounds protect metals against corrosion by adsorbing on the metal’s surface forming a protective layer with their adsorption following at least one of the classical adsorption isotherms. They showed excellent inhibition efficiencies which depend on the concentration and the temperature of the environment. Azo-dyes are therefore good prospective inhibitors against most metals corrosion in an aggressive environment.

 Keywords:

Azo-dyes, corrosion inhibitors, acidic media, heteroatoms.

Please cite this article as:

Justinah Solayide Amoko, Christopher Olumuyiwa Aboluwoye & Oluwatoba Emmanuel Oyeneyin (2019). Review on Azo-dyes and their corrosion Inhibitory Potentials in Aggressive Media- Experimental and Theoretical approach. International Journal of Recent Research and Applied Studies, 6, 1(5), 25-30.