Tin-free steel sheets having improved lacquer adhesion
US4542077A · kind A · utility
2Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1984 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Aug 2, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12611
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
This invention provides a tin-free steel sheet, having superior lacquer adhesion, comprising metallic chromium and chromium oxide coatings on a steel sheet, characterized in that the chromium oxide coating is controlled such that I.sub.Cr.sup.580 /(I.sub.Cr.sup.580 +I.sub.Cr.sup.660) has a value of 0.5 or more provided that I.sub.Cr.sup.580 is the percent transmission corresponding to ol linkage and I.sub.Cr.sup.660 is the percent transmission corresponding to oxo linkage in the infrared absorption spectrum of said chromium oxide coating as measured by Fourier transform infra-red spectroscopy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.