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US4746412A
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US
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Iron-phosphorus electroplating bath and electroplating method using same
Assignee: Toyota Motor Corp
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Filing: 1986-07-03
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Granted: 1988-05-24
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Expires: 2006-07-03
Abstract
Abstract An Fe-P alloy film is electrodeposited on a workpiece in a bath comprising 20-80 g/l ferrous ion, 0.01-15 g/l hypophosphorous acid and/or a hypophosphite, and 0.05-5 g/l aluminum ion or a bath comprising 20-80 g/l ferrous ion and 0.01-20 g/l phosphorous acid and/or a phosphite, and optionally aluminum ion at 10 DEG -80 DEG C. and 0.5-30 A/dm2. There is obtained a crack-free alloy film having a P content of 0.1 to 9.9 wt %.
Inventors
- 👤 Hiroki Uchida
- 👤 Yosiomi Aoyagi
- 👤 Tsuyoshi Uotani
- 👤 Yoshio Takagi
- 👤 Shinji Kato
- 👤 Hitoshi Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:20
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/562; F; F02; F02B; F02B77/00; F02B77/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
74 words
An iron-phosphorus electroplating bath comprising a ferrous ion, hypophosphorous acid and/or a hypophosphite, and an aluminum ion, wherein the ferrous ion is present in an amount of 20 to 80 grams, the hypophosphorous acid and/or hypophosphite is present in an amount of 0.01 to 15 grams calculated as NaH 2 PO 2 .H 2 O, and the aluminum ion is present in an amount of 0.05 to 5 grams per liter of the bath.
Claim 2
Dependent Claim
74 words
An iron-phosphorus electroplating bath comprising a ferrous ion, hypophosphorous acid and/or a hypophosphite, and an aluminum ion, wherein the ferrous ion is present in an amount of 20 to 80 grams, the hypophosphorous acid and/or hypophosphite is present in an amount of 0.01 to 15 grams calculated as NaH 2 PO 2 .H 2 O, and the aluminum ion is present in an amount of 0.05 to 5 grams per liter of the bath.
Claim 3
Dependent Claim
39 words
The plating bath according to claim 1, further comprising 5 to 500 grams per liter of the bath of at least one water-insoluble material selected from the group consisting of metals, water-insoluble inorganic and organic fine particulates, and fibers.
Claim 4
Dependent Claim
24 words
The plating bath according to claim 1, further comprising at least one member selected from the group consisting of titanium compounds and zirconium compounds.
Claim 5
Dependent Claim
46 words
A method for electroplating an iron-phosphorus film on a workpiece, comprising immersing the workpiece in a plating bath as set forth in claim 1 and effecting electroplating at a cathode current density of 0.5 to 30 A/dm 2 and a temperature of 10° to 80° C.
Claim 6
Dependent Claim
18 words
The method according to claim 4, wherein the thickness of the iron-phosphorus film is 1 to 250 μm.
Claim 7
Dependent Claim
14 words
The plating bath according to claim 1, wherein the pH is 0.5 to 2.5.
Claim 8
Dependent Claim
62 words
An iron phosphorus electroplating bath comprising a ferrous ion and phosphorous acid and/or a phosphite as essential ingredients, wherein the ferrous ion is present in an amount of 20 to 80 grams, and the phosphorous acid and/or phosphite is present in an amount of 0.01 to 20 grams calculated as NaH 2 PO 3 .2H 2 O per liter of the bath.
Claim 9
Dependent Claim
62 words
An iron phosphorus electroplating bath comprising a ferrous ion and phosphorous acid and/or a phosphite as essential ingredients, wherein the ferrous ion is present in an amount of 20 to 80 grams, and the phosphorous acid and/or phosphite is present in an amount of 0.01 to 20 grams calculated as NaH 2 PO 3 .2H 2 O per liter of the bath.
Claim 10
Dependent Claim
21 words
The plating bath according to claim 7, further comprising 0.05 to 5 grams of aluminum ion per liter of the bath.
Claim 11
Dependent Claim
39 words
The plating bath according to claim 7, further comprising 5 to 500 grams per liter of the bath of at least one water-insoluble material selected from the group consisting of metals, water-insoluble inorganic and organic fine particulates, and fibers.
Claim 12
Dependent Claim
34 words
The plating bath according to claim 7, further comprising 0.05 to 10 grams per liter of the bath of at least one member selected from the group consisting of titanium compounds and zirconium compounds.
Claim 13
Dependent Claim
46 words
A method for electroplating an iron-phosphorus film on a workpiece, comprising immersing the workpiece in a plating bath as set forth in claim 7, and effecting electroplating at a cathode current density of 0.5 to 30 A/dm 2 and a temperature of 10° to 80° C.
Claim 14
Dependent Claim
18 words
The method according to claim 11, wherein the thickness of the iron-phosphorus film is 1 to 250 μm.
Claim 15
Dependent Claim
14 words
The plating bath according to claim 7, wherein the pH is 0.5 to 2.5.
Claim 16
Dependent Claim
103 words
An iron-phosphorus electroplating bath comprising a ferrous ion, hypophosphorous acid and/or a hypophosphite, phosphorous acid and/or a phosphite, and an aluminum ion, wherein the ferrous ion is present in an amount of 20 to 80 grams, the hypophosphorous acid and/or hypophosphite is present in an amount of 0.01 to 15 grams calculated as NaH 2 PO 2 .H 2 O, the phosphorous acid and/or phosphite is present in an amount of 0.01 to 20 grams calculated as NaH 2 PO 3 .2H 2 O, and the aluminum ion is present in an amount of 0.05 to 5 grams per liter of the bath.
Claim 17
Dependent Claim
103 words
An iron-phosphorus electroplating bath comprising a ferrous ion, hypophosphorous acid and/or a hypophosphite, phosphorous acid and/or a phosphite, and an aluminum ion, wherein the ferrous ion is present in an amount of 20 to 80 grams, the hypophosphorous acid and/or hypophosphite is present in an amount of 0.01 to 15 grams calculated as NaH 2 PO 2 .H 2 O, the phosphorous acid and/or phosphite is present in an amount of 0.01 to 20 grams calculated as NaH 2 PO 3 .2H 2 O, and the aluminum ion is present in an amount of 0.05 to 5 grams per liter of the bath.
Claim 18
Dependent Claim
14 words
The plating bath according to claim 14, wherein the pH is 0.5 to 2.5.
Claim 19
Independent Claim
103 words
A method for making a slide member, comprising forming an electroplated iron-phosphorus film having a phosphorus content of 0.1 to 9.9% by weight on a slide member blank using an iron-phosphorus electroplating bath comprising a ferrous ion, hypophosphorous acid and/or a hypophosphite, and an aluminum ion, wherein the ferrous ion is present in an amount of 20 to 80 grams, the hypophosphorous acid and/or hypophosphite is present in an amount of 0.01 to 15 grams calculated as NaH 2 PO 2 .H 2 O, and the aluminum ion is present in an amount of 0.05 to 5 grams per liter of the bath.
Claim 20
Independent Claim
103 words
A method for making a slide member, comprising forming an electroplated iron-phosphorus film having a phosphorus content of 0.1 to 9.9% by weight on a slide member blank using an iron-phosphorus electroplating bath comprising a ferrous ion, hypophosphorous acid and/or a hypophosphite, and an aluminum ion, wherein the ferrous ion is present in an amount of 20 to 80 grams, the hypophosphorous acid and/or hypophosphite is present in an amount of 0.01 to 15 grams calculated as NaH 2 PO 2 .H 2 O, and the aluminum ion is present in an amount of 0.05 to 5 grams per liter of the bath.
Claim 21
Independent Claim
87 words
A method for making a slide member, comprising forming an electroplated iron-phosphorus film having a phosphorus content of 0.1 to 9.9% by weight on a slide member blank using an iron-phosphorus electroplating bath comprising a ferrous ion and phosphorous acid and/or a phosphite, wherein the ferrous ion is present in an amount of 20 to 80 grams, and the phosphorous acid and/or phosphite is present in an amount of 0.01 to 20 grams calculated as NaH 2 PO 3 .2H 2 O per liter of the bath.
Claim 22
Independent Claim
87 words
A method for making a slide member, comprising forming an electroplated iron-phosphorus film having a phosphorus content of 0.1 to 9.9% by weight on a slide member blank using an iron-phosphorus electroplating bath comprising a ferrous ion and phosphorous acid and/or a phosphite, wherein the ferrous ion is present in an amount of 20 to 80 grams, and the phosphorous acid and/or phosphite is present in an amount of 0.01 to 20 grams calculated as NaH 2 PO 3 .2H 2 O per liter of the bath.
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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |