CR.sub.2 O.sub.3 -protective coating and process for its manufacture
US4898785A · kind A · utility
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8Claims
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Assignee
Inventor
Key dates
| Filing date | May 22, 1989 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | May 22, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C4/137
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The Cr.sub.2 O.sub.3 protective coating (3) is applied, during the vacuum spray process, as a leakproof coating to a support (1), and has a density of not more than 5.3 g/cm.sup.3, a residual porosity of less than 2%, a Vickers hardness (HV) of over 2000 kp/mmm.sup.2 and an electric strength of at least 5 V/.mu.m of protective thickness; it is particularly suited as a protective coating on supports (3) exposed to corrosion and simultaneously subjected to high mechanical loads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.