Two-stage pretreatment of aluminum, in particular aluminum casting alloys, comprising pickle and conversion treatment

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United States of America Patent

PATENT NO 11499237
APP PUB NO 20200208273A1
SERIAL NO

16817044

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Abstract

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The present invention relates to a method for the anti-corrosion treatment of components produced from aluminum, in particular casting parts such as vehicle rims, comprising a pretreatment stage and subsequent coating, wherein the pretreatment stage in turn includes a pickle on the basis of sulfuric acid aqueous solutions containing water-soluble compounds of the element Ti and at least one α-hydroxycarboxylic acid which is carried out upstream of an acidic conversion treatment on the basis of an acidic aqueous solution containing water-soluble compounds of the elements Zr and/or Ti.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Geick, Volker Grevenbroich, DE 3 1
Schaeuble, Kathrin Duesseldorf, DE 1 0

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