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Zinc pigments react in aqueous alkaline media (e.g. water-borne paints) by the evolution of hydrogen which can be measured gasvolumetrically. The addition of both pure citric acid or pure metal salts stimulated the corrosion reaction of zinc pigment in aqueous alkaline media. The addition of soluble zinc(II) and aluminium(III) chelates of citric acid reduced the hydrogen evolution of zinc pigment...
Zinc pigments react in aqueous alkaline media (e.g. water-borne paints) by the evolution of hydrogen; at pH 10 more hydrogen is evolved than at pH 8. With the addition of phenol derivatives the opposite effect is observed: hydrogen volumes evolved are higher at pH 8 than at pH 10. These results can be explained with regard to the isoelectric point (IEP) of zinc oxide (pH 9). It is supposed that...
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