Cleaning and etching process for aluminum containers
US4477290A · kind A · utility
43Cited by
20References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1983 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Jan 10, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Drawn and ironed (D & I) aluminum can bodies are prepared for conversion coating by cleaning and etching using a spray of a dilute aqueous solution of caustic and chelating agent at temperatures of up to about 130.degree. F. The dilute aqueous alkaline solution consists essentially of from about 6 to 12 grams per liter of an alkali metal hydroxide and from about 3 to 6 grams per liter of a chelating agent. The cleaning and etching can be accomplished in a single step without smut formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.