Investigations of the influence of vapour phase inhibitors on the surface charge of iron oxide particles by zeta‐potential measurements
Identifieur interne : 000209 ( Allemagne/Analysis ); précédent : 000208; suivant : 000210Investigations of the influence of vapour phase inhibitors on the surface charge of iron oxide particles by zeta‐potential measurements
Auteurs : Künzelmann [Allemagne] ; Jacobasch [Allemagne] ; Reinhard [Allemagne]Source :
- Materials and Corrosion [ 0947-5117 ] ; 1989-12.
Abstract
Adsorbability of the vapour phase inhibitor dicyclohexylammonium nitrite (Dichan) and its ionic constituents present in aqueous media were investigated by means of zeta‐potential measurements in 10−3 M KCl solution in dependence on the pH‐value using particles of various iron oxides and oxide hydroxides. It was pointed out, that the interactions between Dichan and iron oxides result in a negativation of the zeta‐potential and in a displacement of the isoelectric point of the particles surface (IEPS) due to specific adsorption of anions. By dicyclohexylamine in the primary solution, the zeta‐potential of iron oxides is hardly influenced, even when the saturation concentration is established. As nitrite changes the chemical surface properties when concentrations considerably higher than those indicated for Dichan are achieved, a synergism is assumed to be present because of the Dichan's high adsorbability at oxidic iron compounds. This effect probable consist in the promotion of the specific adsorption of nitrite ions at the oxide surface by the amine component.
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DOI: 10.1002/maco.19890401206
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It was pointed out, that the interactions between Dichan and iron oxides result in a negativation of the zeta‐potential and in a displacement of the isoelectric point of the particles surface (IEPS) due to specific adsorption of anions. By dicyclohexylamine in the primary solution, the zeta‐potential of iron oxides is hardly influenced, even when the saturation concentration is established. As nitrite changes the chemical surface properties when concentrations considerably higher than those indicated for Dichan are achieved, a synergism is assumed to be present because of the Dichan's high adsorbability at oxidic iron compounds. This effect probable consist in the promotion of the specific adsorption of nitrite ions at the oxide surface by the amine component.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Kunzelmann" sort="Kunzelmann" uniqKey="Kunzelmann" last="Künzelmann">Künzelmann</name></noRegion><name sortKey="Jacobasch" sort="Jacobasch" uniqKey="Jacobasch" last="Jacobasch">Jacobasch</name><name sortKey="Reinhard" sort="Reinhard" uniqKey="Reinhard" last="Reinhard">Reinhard</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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