Method of producing tin-free steel sheets
US4579633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | May 26, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S205/917
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Tin-free steel sheets having intimately bonded metallic chromium and hydrated chromium oxide coatings thereon and possessing improved resistance to retorting treatment and improved adhesion to paint films to be applied thereon are produced by chromium plating a steel sheet in a chromium plating bath containing an assistant to deposit and form metallic chromium and hydrated chromium oxide coatings on the sheet surface, subjecting the sheet to reverse electrolysis in the same chromium plating bath to partially dissolve away the metallic chromium and hydrated chromium oxide coatings together with the assistant anions codeposited in the hydrated chromium oxide coating, rinsing the sheet with water, and thereafter subjecting the sheet to an electrolytic chromate treatment in an electrolytic chromate treating bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.