Test method for phosphate coatings
US4533639A · kind A · utility
2Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1984 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Jun 20, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/25125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the coating weight and composition of a zinc phosphate coating on a ferrous metal surface comprises stripping the coating from a known area using an aqueous solution of sodium hydroxide and triethanolamine, thereafter measuring the iron and phosphate contents by colorimetric analysis of the stripping solution and then determining the coating weight and composition based on such measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.