Coating for cold working metals
AssigneeHenkel AG & Co. KGaA
InventorRichard J. Church
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Abstract
The invention involves a composition for forming a combined conversion and lubricating coating on a metal substrate with which the composition is brought into contact. The composition comprises (a) an oxyethylated aliphatic alcohol whose aliphatic hydrocarbon moiety contains 18 or more carbon atoms and (b) dissolved phosphate anions. Preferably the composition also comprises inorganic boron, an alkali metal salt of a fatty acid, and an accelerator for phosphate coating.
Claims16
A composition for forming a combined conversion and lubricating coating on a metal substrate with which the composition is brought into contact, the composition comprising:
- at least one oxyethylated aliphatic alcohol whose aliphatic hydrocarbon moiety contains 18 or more carbon atoms in an amount of about 0.5 to about 15 wt % of the composition;
- dissolved phosphate anions having a concentration of at least 0.2 wt % and not more than about 20 wt % of the composition;
- and
- a component selected from the group consisting of lithium salts, sodium salts, and potassium salts of fatty organic acids, wherein anions of the fatty organic acids include at least 10 carbon atoms, and cations are selected from the group consisting of sodium, lithium, and potassium;
- said component present in an amount, measured as its stoichiometric equivalent as lithium stearate with the stoichiometry being based on equal numbers of carboxylate anions, such that said component has a ratio to said at least one oxyethylated aliphatic alcohol that is at least 0.2:1.0 and not more than 10:1.0.
Dependencies are inferred from the claim text.