Precoated chromium alloyed steel with enhanced paint adhesion for exhaust applications
US5783622A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1997 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | May 5, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12549
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A stainless steel sheet suitable for use in the manufacture of an exhaust component. The steel sheet has at least one surface pretreated with a protective coating resistant to delamination at temperatures up to about 540.degree. C. including an inner inorganic portion and an outer organic portion. The inorganic portion includes at least 50 mg/m.sup.2 of a chromium based conversion coating having a thickness no greater then 0.02 mm. The conversion coating contains particulate silica with the weight ratio of chromium to silica within the range of 1:1 to 2:1. The outer organic portion includes a silicone paint containing 40-60 wt. % silicone resin. The silicone paint is dried at a temperature less than 300.degree. C. in less than one minute and then coated with a copolymer of a thermoplastic acrylic and a lubricant or a polymeric olefin. The acrylic copolymer contains 5-70 wt. % of the lubricant and the polymeric olefin contains 90% olefin resin. The lubricant coated steel sheet then is dried at a temperature of a 25.degree.-120.degree. C. for less than one minute to form a film thickness of 0.0005-0.020 mm, having a coefficient of friction of no greater than about 0.05 and a weight o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.