US3753664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard iron electroplating of soft substrates and resultant product
Assignee: Motors Liquidation Co
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Filing: 1971-11-24
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Granted: 1973-08-21
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Expires: 1991-11-24
Abstract
Abstract Substrates having low surface strengths are plated with high stress iron by first depositing a layer of low stress iron on the substrate before plating the high stress iron. The low stress iron layer acts like a buffer to mitigate the surface disruptive affects of the high stress iron on the substrate.
Inventors
- 👤 O Klingenmaier
- 👤 Watters J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C25D3/00; C25D3/02; C25D3/20; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12986
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
The process of claim 1 wherein the first low stress iron plating solution and the second high stress iron plating solution are one and the same.
Claim 2
Dependent Claim
228 words
A process for making a plated composite body including a substrate with a low strength surface, a low stress first iron layer on the surface and a high stress second iron layer on the first layer comprising the steps of: contacting a substrate which has a surface-subsurface strength of less than about 200 lbs/in with an iron plating solution at a first predetermined temperature and consisting essentially of at least one ferrous salt selected from the group consisting of ferrous chloride and ferrous fluoborate; cathodizing said substrate and electrolyzing said solution at a sufficiently low current density at that first predetermined temperature to deposit a first layer of iron on the substrate, said first layer having a predetermined thickness of at least about 0.001 inch and a tensile stress of less than about 15,000 psi; while maintaining said substrate in said solution reducing said temperature to a second predetermined temperature lower than the first predetermined temperature; and increasing the current density to a second predetermined current density higher than said low current density and sufficient at said second temperature to deposit a second layer of iron having a tensile stress of at least about 30,000 psi on said first layer; and continuing to cathodize said substrate and electrolyze said solution at said higher current density to deposit at least about 0.001 inch of iron on said first layer.
Claim 3
Dependent Claim
124 words
An article of manufacture comprising: a metallic substrate having a surface-subsurface strength of less than about 200 lbs/in; a first layer of electrodeposited iron on said surface, said layer being at least 0.001 inch thick and having an internal tensile stress of less than about 15,000 psi; and a second layer of iron on said first layer, said second layer having a thickness of at least about 0.001 inch and an internal tensile stress, in the as-plated condition, of at least about 30,000 psi; said first layer being sufficiently thick to mitigate the surface disruptive affects of the second iron layer on the substrate which thickness varies inversely with the strength of the surface-subsurface bond and directly to the thickness of the second layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |