US4141803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for electroplating chromium and its alloys and the method of manufacture of the composition
Assignee: International Business Machines Corp
•
Filing: 1977-09-15
•
Granted: 1979-02-27
•
Expires: 1997-09-15
Abstract
Abstract A plating solution, the making thereof and the use for chromium plating is disclosed. The solution is an equilibrated essentially aqueous solution of a hexavalent thiocyanatochromium III complex wherein the ratio of the total chromium III to the total thiocyanate is about 1:6. A preferred and improved method of making the solution from a hexathiocyanatochromium salt is also disclosed.
Inventors
- 👤 Donald J. Barclay
- 👤 William M. Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
38 words
A method of forming a plating solution comprising the steps of equilibrating an aqueous solution of a salt selected from the group Na 3 Cr(NCS) 6 and K 3 Cr(NCS) 6 and adding boric acid in saturation amount.
Claim 2
Independent Claim
38 words
A method of forming a plating solution comprising the steps of equilibrating an aqueous solution of a salt selected from the group Na 3 Cr(NCS) 6 and K 3 Cr(NCS) 6 and adding boric acid in saturation amount.
Claim 3
Dependent Claim
26 words
The invention as defined, in claim 1, wherein the salt is Na 3 Cr(NCS) 6 , and wherein the solution is electrochemically reduced and thereafter reoxidized.
Claim 4
Dependent Claim
17 words
The invention as defined in claim 2, wherein the salt is prepared electrochemically at a mercury electrode.
Claim 5
Independent Claim
55 words
A method of electroplating chromium comprising the steps of providing an essentially aqueous solution of a chromium III thiocyanate complex in effective concentration for electroplating of chromium, the ratio of the total chromium III to the total thiocyanate being about 1:6, and passing an electric current between an anode and a cathode in said solution.
Claim 6
Independent Claim
55 words
A method of electroplating chromium comprising the steps of providing an essentially aqueous solution of a chromium III thiocyanate complex in effective concentration for electroplating of chromium, the ratio of the total chromium III to the total thiocyanate being about 1:6, and passing an electric current between an anode and a cathode in said solution.
Claim 7
Dependent Claim
26 words
The invention as defined in claim 4 wherein the aqueous solution of the chromium III thiocyanato complex is an equilibrium solution of a hexathiocyanatochromium III salt.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 5, in which the hexathiocyanatochromium (III) salt is selected from the group Na 3 Cr(NCS) 6 and K 3 Cr(NCS) 6 .
Claim 9
Dependent Claim
15 words
The method as claimed in claim 6, wherein the solution is saturated with boric acid.
Claim 10
Dependent Claim
17 words
The invention as defined in claim 4, further characterized by said solution being approximately a 0.05M solution.
Claim 11
Dependent Claim
24 words
A method as claimed in claim 4, further characterized by an effective amount of a salt to increase the electrical conductivity of said solution.
Claim 12
Dependent Claim
23 words
A method as claimed in claim 9, in which the salt is selected from the group sodium perchlorate, sodium sulphate, and potassium sulphate.
Claim 13
Dependent Claim
25 words
A method as claimed in claim 4, further characterized by an effective amount of a wetting agent in said solution to lower the surface tension.
Claim 14
Dependent Claim
58 words
An electroplating solution having a source of chromium comprising an essentially aqueous solution of a chromium III thiocyanate complex, the ratio of total chromium III to total thiocyanate being 1:6, the concentration of the chromium being at least 0.05 M and the thiocyanate being at least 0.30 M, and a salt in effective amount to increase electrical conductivity.
Claim 15
Dependent Claim
58 words
An electroplating solution having a source of chromium comprising an essentially aqueous solution of a chromium III thiocyanate complex, the ratio of total chromium III to total thiocyanate being 1:6, the concentration of the chromium being at least 0.05 M and the thiocyanate being at least 0.30 M, and a salt in effective amount to increase electrical conductivity.
Claim 16
Dependent Claim
23 words
A solution as claimed in claim 12, in which the salt is selected from the group sodium perchlorate, sodium sulphate, and potassium sulphate.
Claim 17
Dependent Claim
62 words
An electroplating solution having a source of chromium comprising an essentially aqueous solution of a chromium III thiocyanate complex, the ratio of total chromium III to total thiocyanate being 1:6, the concentration of the chromium being at least 0.05 M and of the thiocyanate being at least 0.30 M, and an effective amount of a wetting agent to lower the surface tension.
Claim 18
Dependent Claim
62 words
An electroplating solution having a source of chromium comprising an essentially aqueous solution of a chromium III thiocyanate complex, the ratio of total chromium III to total thiocyanate being 1:6, the concentration of the chromium being at least 0.05 M and of the thiocyanate being at least 0.30 M, and an effective amount of a wetting agent to lower the surface tension.
Claim 19
Dependent Claim
70 words
An electroplating solution having a source of chromium comprising an aqueous solution at equilibrium of a chromium III thiocyanate complex selected from the salts Na 3 Cr(NCS) 6 and K 3 Cr(NCS) 6 , the concentration of the chromium being at least 0.05 M and of the thiocyanate being at least 0.30 M, the ratio of total chromium III to total thiocyanate being 1:6, and boric acid in saturation amount.
Claim 20
Dependent Claim
70 words
An electroplating solution having a source of chromium comprising an aqueous solution at equilibrium of a chromium III thiocyanate complex selected from the salts Na 3 Cr(NCS) 6 and K 3 Cr(NCS) 6 , the concentration of the chromium being at least 0.05 M and of the thiocyanate being at least 0.30 M, the ratio of total chromium III to total thiocyanate being 1:6, and boric acid in saturation amount.
Claim 21
Independent Claim
43 words
A method of forming a plating solution comprising the steps of equilibrating an aqueous solution of a salt selected from the group Na 3 Cr(NCS) 6 and K 3 CR(NCS) 6 by heating the solution to about 80° C. for about three hours.
Claim 22
Independent Claim
43 words
A method of forming a plating solution comprising the steps of equilibrating an aqueous solution of a salt selected from the group Na 3 Cr(NCS) 6 and K 3 CR(NCS) 6 by heating the solution to about 80° C. for about three hours.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |