Composition and associated method for inhibiting stain formation on a ferrous metal surface
US6525010B2 · kind B2 · utility
3Cited by
18References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2002 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Jul 23, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition for adding to an aqueous rinse which is applied to a ferrous metal surface after treatment of the ferrous metal surface with an aqueous acid solution is disclosed. The composition includes a base. The base is present in the composition in an amount sufficient to adjust the pH of the aqueous rinse to a value greater than 7.0 after the composition is added to the aqueous rinse. The composition also includes a salt of gluconic acid. The composition further includes a polyquaternium compound. An associated method for inhibiting stain formation on a ferrous metal surface is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.