Protection of aluminum based structures against heat transfer corrosion in cooling systems
US4508684A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1981 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Sep 8, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S422/90
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method is disclosed of protecting heated aluminum based metals subject to heat transfer through the metal to a circulating aqueous cooling solution in contact therewith. The initially constituted cooling solution contains an alkali metal silicate in an adjusted amount above 0.2 gram per liter. The solution while functioning in the cooling system is then exposed to an alkali metal silicate glass causing the glass to progressively dissolve and stabilize the silicate at a level of at least 0.1 gram per liter. The initially prepared solution may also contain ethylene or propylene glycol, alkali metal phosphates and tetraborates in a ratio greater than 4:1, and nitrate, mercaptobenzothiazole or tolyltriazole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.