Abstract
AbstractThe inhibitive effect of new synthesized azonitriles, namely 3-phenyl azo-2-amino-1,1,3-tricyano propene, 3-p-tolyl azo-2-amino-1,1,3-tricyano propene, 3-p-anisyl azo-2-amino-1,1,3-tricyano propene, 3-p-nitro phenyl azo-2 amino-1,1,3-tricyano propene, and 3-p-phenyl carboxylic azo-2-amino-1,1,3-tricyano propene on the corrosion of copper in nitric acid solution was investigated using chemical and electrochemical methods. The inhibition efficiency was found to increase with inhibitor concentration and decreased with rise in solution temperature. Various thermodynamic parameters were calculated and discussed in order to elaborate the mechanism of corrosion inhibition. Polarization measurements revealed that the studied azonitriles acted as mixed inhibitors. The results revealed that these compounds were adsorbed onto the copper surface and the adsorption obeyed the Temkin adsorption isotherm. The quantum chemical calculations were in good agreement with the experimental results.
Highlights
Copper is widely used in many industrial applications in heating and in cooling systems for its high electrical, good corrosion resistance, mechanical workability, and excellent thermal conductivities
The purpose of this paper is to investigate the inhibitive effect of five azonitriles derivatives, namely 3-phenyl azo-2-amino-1,1,3-tricyano propene, 3-p-tolyl azo-2-amino-1,1,3-tricyano propene, 3-p-anisyl azo-2-amino-1,1,3-tricyano propene, 3-p-nitro phenyl azo-2 amino-1,1,3tricyano propene, and 3-p-phenyl carboxylic azo-2-amino-1,1,3-tricyano propene on the copper corrosion in nitric acid solution
Based on the results obtained from the weight loss and electrochemical study, it can be concluded that: (1) Azonitrile derivatives act as good corrosion inhibitors for copper in nitric acid solution
Summary
Copper is widely used in many industrial applications in heating and in cooling systems for its high electrical, good corrosion resistance, mechanical workability, and excellent thermal conductivities. Can suffer severe corrosion in aerated acidic media. Hydrochloric acid typically is used in pickling baths because, unlike sulfuric acid, it can be regenerated. One of the most important methods in the corrosion protection of copper is the use of inhibitors. Organic compounds are successfully used in industries against acidic corrosion of metals (Negm & Zaki, 2009; Raman, Libene, & Quraishi, 2004). The presence of electron donating atoms in the organic compounds such as N, O, S is crucial for an efficient corrosion inhibitor. The corrosion efficiency of organic compounds is related to their adsorption properties such as the type of
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