Scale reducer for zinc phosphating solutions
AssigneePennwalt Corporation
InventorsThomas Clifford Atkiss, William Elgin Keen, Jr.
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Abstract
The hard rock-like scale formed on zinc phosphating equipment is rendered soft and dispersible by adding a scale-reducing amount of dialkyl triamine pentakis methylene phosphonic acid or its alkaline salt in the zinc phosphating solution.
Claims4
In the process of phosphating iron, steel, galvanized steel and aluminum with an aqueous acidic zinc phosphating solution the improvement comprising adding a scale-reducing amount of dialkyl triamine pentakis methylene phosphonic acid or its alkaline salt in which the alkyl group ranges from C.sub.2 to C.sub.8 carbons and the salt is selected from the group consisting of sodium, potassium and ammonium.
In an aqueous acidic concentrate of zinc and phosphate ions for dilution with water to prepare a zinc phosphating solution the improvement comprising the addition of a scale-reducing amount of dialkyl triamine pentakis methylene phosphonic acid or its alkaline salt in which the alkyl group ranges from C.sub.2 to C.sub.8 carbons and the salt is selected from the group consisting of sodium, potassium and ammonium.
Dependencies are inferred from the claim text.