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Corrosion Behaviour of brass in nitric acid solutions

โœ Scribed by Dr. A. A. Al-Suhybani; A. A. Hazza; M. Al-Mishary

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
648 KB
Volume
23
Category
Article
ISSN
0933-5137

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โœฆ Synopsis

Abstract

The corrosion of Brass in nitric acid solutions is studied using thermometric, mass loss and polarization methods. The three methods gave almost similar results. The rate of corrosion was found to increase steadily with nitric acid concentration till about 9M where it starts to slow down. Different inorganic anions at different concentration were used as additives at 5 and 9 M acid and they behave as mixed inhibitors. The open circuit potentials (OCP) were found to depend on acid as well as inhibitor concentrations.

The effect of CrO and CI^โˆ’^ were studied in more detail than other anions. The effect of nitrate ion is to accelerate corrosion at low acid concentration and slightly inhibits the corrosion at 9 M acid. This behaviour was attributed to the adsorption of the ion on the Zn part of the alloy where it enhances corrosion while the ion adsorped on the Cu part of the alloy leads to the retardation of corrosion and the net effect will be the result of these opposing processes.

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