Alkaline cleaning compositions non-corrosive toward aluminum surfaces
US4457322A · kind A · utility
45Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1983 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Feb 11, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An alkaline composition and method of cleaning aluminum surfaces is disclosed which avoids discoloring or tarnishing of the metal surface. The composition comprises a mixture of alkali metal metasilicate and a compound chosen from the group consisting of sodium carbonate, potassium carbonate, lithium carbonate, potassium orthophosphate and sodium orthophosphate and mixtures thereof, wherein the metasilicate salt is present in an effective amount up to about 3% by weight of the composition and wherein the pH ranges above about 12.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.