Acid aqueous phosphatic solution and process using same for phosphating metal surfaces
AssigneeNovamax ITB s.r.l.
InventorCesare Pedrazzini
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Abstract
An acid aqueous solution useful for phosphating metal surfaces and a phosphating process using same; said solution, which is characterized by its containing hydroxylamine phosphate as accelerator and a cationic surfactant can be applied to metal surfaces based on iron, zinc, aluminium and alloys thereof, and is specifically suitable for preventing the formation of white spots.
Claims15
An acid aqueous phosphatic solution suitable for forming compact and resistant phosphatic films on metal surfaces, in the absence of white spots, said phosphatic solution consisting of a zinc phosphating solution containing hydroxylamine phosphate in a quantity ranging from 0.6 to 3 g/l and a cationic amino which surfactant contained in a quantity ranging from 0.001 to 1 g/l.
Process for forming a compact and resistant phosphate layer on metal surfaces, in the absence of white spots, said process comprising the step of treating metal surfaces with a zinc phosphatic aqueous solution containing hydroxylamine phosphate in a quantity ranging from 0.6 to 3 g/l and a cationic ammonium surfactant in a quantity ranging from 0.001 to 1 g/l.
Dependencies are inferred from the claim text.