Anodized aluminum etching process and related apparatus
US7029597B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2001 |
| Grant date | Apr 18, 2006 |
| Priority date | — |
| Expiry date | Oct 16, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/24
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for selectively etching a surface of an anodized aluminum article. A preferred process includes: providing an aluminum sheet or web including first and second sides having anodized finishes; etching the first side to improve the adhesion capabilities of that side but not etching the second side so that the second side retains its anodized finish. The anodized aluminum may be colored before etching, thus the second side retains its color after etching. In a more preferred embodiment, sodium hydroxide or phosphoric acid is used to etch the anodized aluminum. Optionally, the etching of the second side is prevented by administering gas or liquid over the second side, masking the second side with a protective film, or shielding the second side with a shield. Further, the gas or liquid administered over the second side may be controlled to increase or decrease the rate of etching on the first side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.