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US4889602A
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Electroplating bath and method for forming zinc-nickel alloy coating
Assignee: Dipsol Chemicals Co Ltd
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Filing: 1988-04-25
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Granted: 1989-12-26
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Expires: 2008-04-25
Abstract
Abstract The invention provides an electroplating bath for forming a zinc-nickel alloy coating consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one compound from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in an amount from 0 to 2 mols/liter, said bath having a pH of more than 11. The invention also provides an electroplating method for forming a chromate coating on a zinc-nickel alloy coating electrolytically deposited from the electroplating bath defined in the preceding sentence on electrically conductive metalics matrix material, and forming a chromate coating on the zinc-nickel alloy coating by means of a chromate treatment.
Inventors
- 👤 Katsuhide Oshima
- 👤 Toshiaki Murai
- 👤 Hitoshi Sakurai
- 👤 Shuji Igarashi
- 👤 Haruo Hanagata
- 👤 Hidesato Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:17
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
102 words
An electroplating bath for forming a zinc-nickel alloy coating consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio, said bath having a pH of more than 11.
Claim 2
Dependent Claim
102 words
An electroplating bath for forming a zinc-nickel alloy coating consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio, said bath having a pH of more than 11.
Claim 3
Dependent Claim
51 words
The electroplating bath of claim 1 wherein said bath also contains at least one hydroxyaliphatic carboxylic acid selected from the group consisting of tartaric acid, sodium tartrate, citric acid, sodium citrate, disodium citrate, glycolic acid and sodium glycolate or a salt thereof in an amount of from 0.01 to 2 mols/liter.
Claim 4
Dependent Claim
91 words
The electroplating bath of claim 2 wherein zinc is in an amount of 1 to 70 g/liter and nickel is in an amount of 0.6 to 118 g/liter; said bath contains at least one compound selected from the group consisting of NaOH, KOH, Na 2 CO 3 and K 2 CO 3 in an amount of 1 to 300 g/liter; and said bath contains at least one aliphatic amine selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, ethylenediamine, diethylenetriamine, imino-bis-propylamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, and N,N'-bis-(triaminopropyl) ethylenediamine or a polymer thereof.
Claim 5
Dependent Claim
24 words
The electroplating bath of claim 3 wherein said bath also contains at least one aromatic aldehyde in an amount effective as a brightening agent.
Claim 6
Dependent Claim
13 words
The electroplating bath of claim 4 wherein said pH is at least 14.
Claim 7
Dependent Claim
65 words
The electroplating bath of claim 5 wherein zinc is added as a component selected from the group consisting of ZnO, ZnSO 4 7H 2 O, ZnCO 3 and Zn(CH 3 COO) 2 , and said nickel is added as a component from the group consisting of NiSO 4 6H 2 O, NiCO 3 and (NH 4 ) 2 Ni(SO 4 ) 2 6H 2 O.
Claim 8
Dependent Claim
22 words
The electroplating bath of claim 2 wherein the minimum amount of said aliphatic amines (i) or polymers thereof (ii) is 0.03 mol/liter.
Claim 9
Dependent Claim
37 words
The electroplating bath of claim 1 wherein said bath contains at least one aliphatic amine selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, ethylenediamine, diethylenetriamine, imino-bis-propylamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, and N,N'-bis-(triaminopropyl) ethylenediamine or a polymer thereof.
Claim 10
Dependent Claim
24 words
The electroplating bath of claim 1 wherein said bath also contains at least one aromatic aldehyde in an amount effective as a brightening agent.
Claim 11
Dependent Claim
39 words
The electroplating bath of claim 1 wherein said bath contains at least one compound selected from the group consisting of NaOH, KOH, Na 2 CO 3 and K 2 CO 3 in an amount of 1 to 300 g/liter.
Claim 12
Dependent Claim
84 words
The electroplating bath of claim 1 wherein zinc is added as a component selected from the group consisting of ZnO, ZnSO 4 7H 2 O, ZnCO 3 and Zn(CH 3 COO) 2 in an amount of 1 to 70 g/liter of zinc, and said nickel is added as a component from the group consisting of NiSO 4 6H 2 O, NiCO 3 and (NH 4 ) 2 Ni(SO 4 ) 2 6H 2 O in an amount of 0.6 to 118 g/liter of nickel.
Claim 13
Dependent Claim
13 words
The electroplating bath of claim 1 wherein said pH is at least 14.
Claim 14
Dependent Claim
30 words
The electroplating bath of claim 1 wherein the bath contains at least one of said aliphatic amines (i) or polymers thereof (ii) in an amount of at least 0.03 mol/liter.
Claim 15
Dependent Claim
54 words
The electroplating bath of claim 1 consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, and at least one compound from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, said bath having a pH of more than 11.
Claim 16
Dependent Claim
57 words
The electroplating bath of claim 1 consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, and at least one compound from the group consisting of (ii) polymers of aliphatic amines in an amount not more than about 20 grams/liter, said bath having a pH of more than 11.
Claim 17
Dependent Claim
59 words
The electroplating bath of claim 1 consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, (i) aliphatic amines in an amount not more than 16 grams/liter and (ii) polymers of aliphatic amines in an amount not more than about 20 grams/liter, said bath having a pH of more than 11.
Claim 18
Dependent Claim
91 words
The electroplating bath of claim 1 consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, at least one compound from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, and (ii) polymers of aliphatic amines in an amount not more than about 20 grams/liter, and a compound from the group consisting of (iii) hydroxyaliphatic carboxylic acids and salts thereof in an amount from 0.01 to 2 mols/liter, said bath having a pH of more than 11.
Claim 19
Dependent Claim
147 words
The electroplating method for forming a zinc-nickel alloy coating on an electrically conductive metallic matrix material comprising electrolytically depositing a zinc-nickel alloy coating on the matrix material from an electroplating bath consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in amount not more than 2 mols/liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio, said bath having a pH of more than 11.
Claim 20
Dependent Claim
147 words
The electroplating method for forming a zinc-nickel alloy coating on an electrically conductive metallic matrix material comprising electrolytically depositing a zinc-nickel alloy coating on the matrix material from an electroplating bath consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in amount not more than 2 mols/liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio, said bath having a pH of more than 11.
Claim 21
Dependent Claim
24 words
The electroplating method of claim 18 wherein said metallic matrix is selected from the group consisting of steel, copper, copper alloys and aluminum alloys.
Claim 22
Dependent Claim
22 words
The electroplating method of claim 18 wherein said bath contains said hydroxyaliphatic carboxylic acid in an amount of at least 0.01 mol/liter
Claim 23
Dependent Claim
41 words
The electroplating method of claim 20 wherein said bath contains at least one hydroxyaliphatic carboxylic acid selected from the group consisting of tartaric acid, sodium tartrate, citric acid, sodium citrate, disodium citrate, glycolic acid and sodium glycolate or a salt thereof.
Claim 24
Dependent Claim
98 words
The electroplating method of claim 21 wherein zinc is in an amount of 1 to 70 g/liter and nickel is in an amount of 0.6 to 118 g/liter; said bath contains at least one compound selected from the group consisting of NaOH, KOH, Na 2 CO 3 and K 2 CO 3 in an amount of 1 to 300 g/liter; and said bath contains at least 0.03 mol per liter of at least one aliphatic amine selected from the group consisting of monoethanolamine, monoethanolamine, diethanolamine, triethanolamine, ethylenediamine, diethylenetriamine, imino-bis-propylamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, and N,N'-bis-(triaminopropyl) ethylenediamine or polymer thereof.
Claim 25
Dependent Claim
24 words
The electroplating method of claim 22 wherein said bath also contains at least one aromatic aldehyde in an amount effective as a brightening agent.
Claim 26
Dependent Claim
13 words
The electroplating method of claim 23 wherein said pH is at least 14.
Claim 27
Dependent Claim
68 words
The electroplating method of claim 24 wherein zinc is added as a component selected from the group consisting of at least one ZnO, ZnSO 4 7H 2 O, ZnCO 3 and Zn(CH 3 COO) 2 , and said nickel is added as a component from the group consisting of NiSO 4 6H 2 O, NiCO 3 and (NH 4 ) 2 Ni(SO 4 ) 2 6H 2 O.
Claim 28
Dependent Claim
24 words
The electroplating method of claim 18 wherein said bath contains said aliphatic amine or polymer thereof in an amount of at least 0.03 mol/liter.
Claim 29
Dependent Claim
36 words
The electroplating method of claim 26 wherein said bath contains at least one aliphatic amine selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, ethylenediamine, diethylenetriamine, imino-bis-propylamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, and N,N'-bis-(triaminopropyl) ethylenediamine or polymer thereof.
Claim 30
Dependent Claim
24 words
The electroplating method of claim 18 wherein said bath also contains at least one aromatic aldehyde in an amount effective as a brightening agent.
Claim 31
Dependent Claim
39 words
The electroplating method of claim 18 wherein said bath contains at least one compound selected from the group consisting of NaOH, KOH, Na 2 CO 3 and K 2 CO 3 in an amount of 1 to 300 g/liter.
Claim 32
Dependent Claim
87 words
The electroplating method of claim 18 wherein zinc is added as a component selected from the group consisting of at least one ZnO, ZnSO 4 7H 2 O, ZnCO 3 and Zn(CH 3 COO) 2 in an amount of 1 to 70 g/liter of zinc, and said nickel is added as a component from the group consisting of NiSO 4 6H 2 O, NiCO 3 and (NH 4 ) 2 Ni(SO 4 ) 2 6H 2 O in an amount of 0.6 to 118 g/liter of nickel.
Claim 33
Dependent Claim
13 words
The electroplating method of claim 18 wherein said pH is at least 14.
Claim 34
Dependent Claim
57 words
The electroplating method of claim 18 wherein said bath consists essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, and at least one compound from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, said bath having a pH of more than 11.
Claim 35
Dependent Claim
60 words
The electroplating method of claim 18 wherein said bath consists essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, and at least one compound from the group consisting of (ii) polymers of aliphatic amines in an amount not more than about 20 grams/liter, said bath having a pH of more than 11.
Claim 36
Dependent Claim
62 words
The electroplating method of claim 18 wherein said bath consists essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, (i) aliphatic amines in an amount not more than 16 grams/liter and (ii) polymers of aliphatic amines in an amount not more than about 20 grams/liter, said bath having a pH of more than 11.
Claim 37
Dependent Claim
95 words
The electroplating method of claim 18 wherein said bath consists essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams/liter of nickel, at least one amine compound from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter and (ii) polymers of aliphatic amines in an amount not more than about 20 grams/liter, and a compound from the group consisting of (iii) hydroxyaliphatic carboxylic acids and salts thereof in an amount from 0.01 to 2 mols/liter, said bath having a pH of more than 11.
Claim 38
Dependent Claim
167 words
The electroplating method for forming a chromate coating on a zinc-nickel alloy coating deposited electrolytically on electrically conductive metallic matrix material comprising electrolytically depositing a zinc-nickel coating on the matrix material from an electroplating bath consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in amount not more than 2 mols/liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio, said bath having a pH of more than 11, and forming a chromate coating on the zinc-nickel alloy coating by means of a chromate treatment.
Claim 39
Dependent Claim
167 words
The electroplating method for forming a chromate coating on a zinc-nickel alloy coating deposited electrolytically on electrically conductive metallic matrix material comprising electrolytically depositing a zinc-nickel coating on the matrix material from an electroplating bath consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in amount not more than 2 mols/liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio, said bath having a pH of more than 11, and forming a chromate coating on the zinc-nickel alloy coating by means of a chromate treatment.
Claim 40
Dependent Claim
24 words
The electroplating method of claim 36 wherein said metallic matrix is selected from the group consisting of steel, copper, copper alloys and aluminum alloys.
Claim 41
Dependent Claim
144 words
An electroplating bath for forming a zinc-nickel alloy coating consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in an amount not more than 2 mols/liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio and said bath also contains at least one aromatic aldehyde in an amount effective as a brightening agent, said bath having a pH of more than 11.
Claim 42
Dependent Claim
144 words
An electroplating bath for forming a zinc-nickel alloy coating consisting essentially of water, about 1 to 70 grams/liter of zinc, about 0.6 to 118 grams per liter of nickel, at least one component from the group consisting of (i) aliphatic amines in an amount not more than 16 grams/liter, (ii) polymers of aliphatic amines in an amount not more than about 20 grams per liter and (iii) a compound selected from the group consisting of hydroxyaliphatic carboxylic acids and salts thereof in an amount not more than 2 mols/liter, said at least one component being in an effective amount so that the electrodeposited zinc-nickel alloy coating electrodeposited from said bath has a substantially uniform zinc-nickel alloy ratio and said bath also contains at least one aromatic aldehyde in an amount effective as a brightening agent, said bath having a pH of more than 11.
Claim 43
Dependent Claim
37 words
The electroplating bath of claim 38 wherein the minimum amount of said aliphatic amines (i) or polymers thereof (ii) is 0.03 mol/liter and the minimum amount of said hydroxyaliphatic carboxylic acids or salts thereof is 0.01 mol/liter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |