Abstract
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 dispersions compared to pure citric acid; but the level of hydrogen evolved was still very high. In contrast, soluble cerium(III) chelates of citric acid were powerful corrosion inhibitors for zinc pigments in aqueous alkaline media. The pronounced corrosion inhibiting effect of the cerium(III) chelates could be attributed to cerium and not to the charge of the chelates.
Published Version
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