Finishing agent for chemical conversion coating and method for producing same
US9499700B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2011 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Aug 11, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2222/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A finishing agent satisfies a condition that (A) the ratio of the chromium equivalent molar concentration of a water-soluble trivalent chromium-containing substance contained in the finishing agent relative to the phosphorus equivalent molar concentration of a water-soluble phosphoric acid-based compound contained in the finishing agent is 0.5 or more, or a condition that (B) a water-soluble aluminum-containing substance and/or a water-soluble zirconium-containing substance are contained in the finishing agent such that the ratio of the total of the chromium equivalent molar concentration of the water-soluble trivalent chromium-containing substance, the aluminum equivalent molar concentration of the water-soluble aluminum-containing substance, and the zirconium equivalent molar concentration of the water-soluble zirconium-containing substance relative to the phosphorus equivalent molar concentration of the water-soluble phosphoric acid-based compound is 0.5 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.