Abstract
Cathodic protection of 70/30 brass in 2·0 M nitric acid in the presence of 23 aromatic monoamines and 3 heterocyclic amines has been investigated. The inhibitive efficiency of two substances may be identical in the absence of impressed current, but under the influence of the external current the efficiencies may differ, no doubt due to the effect of the change in potential on the degree of adsorption. An accelerator of corrosion in the absence of external current can become an inhibitor under the influence of an impressed cathodic current. The protective potential corresponding to a protection current is not a constant value, but varies with each system and with the concentration of the inhibitor.
This study indicates that the application of external cathodic polarisation in the pickling of brass in the presence of inhibitors is beneficial.
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