Corrosion-inhibiting automotive coolant solutions containing effective amounts of sodium silicate having a low ratio of silica to sodium oxide
US5266228A · kind A · utility
3Cited by
14References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1991 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Aug 29, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K5/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Non-corrosive anti-freeze solutions for automotive cooling systems include an anti-corrosive effective amount of a sodium silicate corrosion inhibitor. The sodium silicate has an unusually low ratio of silica to sodium oxide of greater than 1.0 to about 2.5. This relatively low ratio of silica to sodium oxide prevents gelation from occurring while maintaining maximum anti-corrosive effectiveness of alcohol-based solutions containing the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.