Degreasing solution and degreasing method
US5415797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1992 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Nov 5, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for degreasing iron, zinc or aluminum metal or an alloy comprising two or more of these metals to be processed by bringing a degreasing solution in contact with the metal to be processed, wherein said degreasing solution contains an alkali silicate, a water-soluble polycarboxylate and a nonionic surfactant and is controlled so as to satisfy the following 1, 2, 3 and 4 conditions. 1 The pH value of the degreasing solution is 10.5 or more. 2 The concentration of an alkali silicate is 100 ppm or more upon converting into the Si element and satisfactory for the following (a) equation: EQU log.sub.10 Y.ltoreq.0.318 X+2.72 (a) 3 The concentration of a water-soluble polycarboxylate is in a range of from 0.01 to 10 g/liter. 4 The concentration of a nonionic surfactant is in a range of from 0.01 to 10 g/liter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.