Alloy-plated sheet steel cured with a thin layer of insulating polymer material forming an electrically nonconductive breachable metal substrate
US6248455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12951
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an electrically insulating polymer coating on a conductive metal substrate, especially zinc and tin-plated sheet steel. The polymer is applied to at least one side of the sheet, the amount being adequate to create a uniform layer of 0.5 to 0.8 micrometers thickness after curing. The polymer coated sheet is heat cured at 200.degree. C. to 210.degree. C. for 10-15 minutes. The thickness of the polymer layer is selected to be within a specified range. The range is determined based upon subsequent manufacturing operations which require an electrically conductive path between a component and the metal substrate. The curing conditions are selected for the dual purpose of heat curing the polymer to the substrate surface as well as to stress relieve the tin or zinc-plated sheet steel. This treatment helps to prevent tin whisker growth and improves the corrosion resistance of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.