Two-stage pretreatment of aluminum, in particular aluminum casting alloys, comprising pickle and conversion treatment
US11499237B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Mar 12, 2020 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | Jul 18, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/82
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.