Process and composition for inhibiting corrosion of metal parts in water systems
US4149969A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1977 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Mar 23, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F11/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process and a composition for inhibiting corrosion of metal parts in water systems such as in recirculating cooling towers and the like, while additionally suppressing scale formation and inhibiting corrosion of copper and copper-containing alloys which comprises adding and dissolving in the aqueous system, a controlled combination of active constituents in effective amounts comprising as essential constituents, an alkali molybdate salt, a divalent metal cation selected from the group consisting of ZN.sup.++, Mn.sup.++ and Ni.sup.++ ; 1-hydroxyethylidene-1,1-diphosphonic acid and the aqueous soluble alkali salts thereof; and an organic agent selected from the group consisting of 2-mercaptobenzothiazole and the alkali salts thereof; 1,2,3-benzotriazole, and tolyltriazole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.