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US 5,958,147 AGranted
Method of treating a metal
AssigneeAkzo Nobel N.V.
InventorsTroy Berglind, Arne Frestad
Life of this patent
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Abstract
The invention relates to a method of pickling or surface treating a metal in an aqueous solution containing nitric acid wherein hydrogen peroxide is supplied to decrease the formation of nitrous fumes. At least a portion of the hydrogen peroxide is supplied by spraying or flushing an aqueous solution thereof directly on the metal through one or several separate nozzles (18a, 18b, 19a, 19b).
Claims10
A method of pickling or surface treating a metal, comprising the steps of
- (a) placing a metal in an aqueous solution containing nitric acid;
- and
- (b) supplying hydrogen peroxide to the aqueous solution in an amount sufficient to decrease the formation of nitrous fumes;
- wherein at least a portion of the hydrogen peroxide is supplied by spraying or flushing an aqueous solution thereof directly on said metal through one or more separate nozzles.
1 more element
Dependencies are inferred from the claim text.