Abstract
Abstract Recent attempts to develop organic chelating agents as wet stain inhibitors for zinc and galvanized products led to the discovery that the thioglycolate grouping HS—CH2—C(O)—O— is extremely reactive towards zinc atoms of a metal surface. This paper reports the development of polythioglycolate compounds, in which two or more of the thioglycolate groupings are bound to a single organic backbone. These inhibitors can impart substantially improved corrosion resistance to zinc surfaces. A large number of such compounds were synthesized and evaluated. Best results were obtained with the trithioglycolate ester of 1,2,6-trihydroxyhexane (TTH). This material may be applied from aqueous dispersions or from solutions of a suitable organic solvent. Zinc and galvanized material treated with it show corrosion resistance comparable to that imparted by the commonly used inorganic chromate coatings. Treated zinc surfaces become highly hydrophobic and show ready compatibility with organic paint formulations.
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