Passivation of micro-discontinuous chromium deposited from a trivalent electrolyte
US10415148B2 · kind B2 · utility
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11References
15Claims
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Key dates
| Filing date | Mar 7, 2014 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Jan 25, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12854
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of treating a substrate, wherein the substrate comprises a layer deposited from a trivalent chromium electrolyte, is described. The method includes the steps of providing an anode and the chromium(III) plated substrate as a cathode in an electrolyte comprising (i) a trivalent chromium salt; and (ii) a complexant; and passing an electrical current between the anode and the cathode to passivate the chromium(III) plated substrate. The substrate may be first plated with a plated nickel layer so that the chromium(III) plated layer is deposited over the nickel plated layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.