Simplified process for producing a corrosion-protecting, well adhering lacquer coating and the workpieces obtained thereby
AssigneeHerberts GmbH
InventorsKlaus Gunter Kerlin, Peter Hamacher
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Abstract
A simplified process for producing a corrosion-protecting, well adhering lacquer coating, and the workpieces obtained thereby, is described. The process comprises subjecting a metal substrate to a pre-treatment by spray or dip phosphate treatment and without subsequent passivation treatment, optionally after a drying, carrying out an electrophoretic dip lacquer coating of the metal substrate treated in this way wherein an electro dip lacquer is used which contains bismuth in the form of an organic bismuth complex and/or a bismuth salt of an organic carboxylic acid in a content of 0.1 to 5 wt. % calculated as bismuth and related to the binder solids in the electro dip lacquer.
Claims8
A process for lacquering metal substrates with a phosphate treatment and electrophoretic dip lacquer coating without the use of environmentally hazardous metal compounds, comprising:
- pretreating the metal substrate with a spray or dip phosphate treatment solution without passivation treatment and without toxic metal compounds, to produce a non-passivated, phosphated-coated, metal substrate without toxic metal compounds in the phosphated coating, and
- coating the phosphate-coated metal substrate with an electrophoretic dip lacquer which contains a bismuth compound of bismuth lactate, bismuth dimethylolpropionate or a combination thereof and is free from tin and lead compounds, wherein the bismuth compound is present in the lacquer to produce a lacquered metal substrate with significant corrosion protection and substrate adhesion.
Dependencies are inferred from the claim text.