Abstract
In a continuation of our investigation of boehmitized aluminium in aqueous solutions the interface was studied in the presence of ethylenediamine which is known to be a corrosion inhibitor for aluminium in acidic solutions. The methods of contact angle and electro-osmosis were used; both methods gave significant results and the influence of ethylenediamine was experimentally established. A parallelism is evident in the positions of the maximum contact angle and of the isoelectric point as functions of the solution pH. In the discussion the presence and equilibrium concentrations of the possible species originating from the ethylenediamine (one un-ionized and two ionized forms) are first accounted for by considering both dissociation constants for ethylenediamine. The influence of the substrate is considered by application of the Hammett concept for the acidic strength of the surface.
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