Acidic cleaning aqueous solution for aluminum and aluminum alloy and method for cleaning the same
US5688755A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1996 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Jun 10, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/125
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An acidic cleaning aqueous solution for carrying out a low temperature acidic cleaning of aluminum and aluminum alloy and a cleaning method for the same free from harmful fluorine and chromium ions. The acidic cleaning aqueous solution includes oxidized metal ions as an etching promoter, an inorganic acid, a surfactant and a certain amount of polyhydric alcohols having at least two hydroxyl groups directly coupled with two adjacent carbon atoms of a principal chain within one molecule and further includes an oxidizing agent for oxidizing the oxidized metal ions reduced in the cleaning. Certain alcohols in the acidic cleaning aqueous solution can control the oxidative decomposition reaction of the surfactant to obtain a long life acidic cleaning aqueous solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.