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Surfactants as corrosion inhibitors for zinc pigment

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A lamellar zinc pigment reacts in aqueous alkaline media (e.g. water-borne paints) with the evolution of hydrogen. This corrosion reaction can be inhibited by certain surfactants. The most important structural part of the examined surfactants is the hydrophilic group; only anionic phosphate or phosphonate hydrophilic groups are effective corrosion inhibitors. Surfactants with carboxylate, sulfonate, amphoteric, cationic and non-ionic hydrophilic groups are ineffective. There seems to be also an influence of the hydrophobic group of the surfactants because a partial ester of phosphoric acid with a fluorinated hydrophobic group was the most effective corrosion inhibitor in this study.
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Keywords: Corrosion Inhibitors; Hydrogen; Surfactants; Zinc

Document Type: Research Article

Publication date: May 1, 1999

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