Zinc pigments were corroded in an aqueous alkaline paint medium by hydrogen (H2) evolution. The corrosion reaction was inhibited by addition of chelate to form aromatic hydroxy compounds of low molecular weight. Propyl, octyl, and dodecyl gallate were found to be good inhibitors for zinc pigments. Inhibition by oligomeric phenolic resins (resole) could be explained by a chelation reaction with zinc(II).

Subject
Acids, Phenols, Pigments, Hydrogen evolution, Aluminum, Corrosion reactions, Dispersion, Acidity, Corrosion inhibitors, Zinc, Paints, Corrosion inhibitive pigments, Resins
Keywords:
alkaline media, aqueous media, gallates, inhibition, paint, phenolic resins, pigment, salicyl alcohol, zinc pigment
NACE International
1996
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