US4051057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions for cleaning surfaces of copper and its alloys
Assignee: Boliden Kemi AB
•
Filing: 1975-12-08
•
Granted: 1977-09-27
•
Expires: 1995-12-08
Abstract
Abstract A solution for pickling copper and its alloys contains one or more mineral acids, such as sulphuric acid or phosphoric acid, in combination with hydrogen peroxide and a hydroxy acid, such as citric acid or gluconic acid, together with a nitrogen combination of the type substituted triazole and/or a tertiary amine of the general formula ##STR1## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n 1 and n 2 is less than 30.
Inventors
- 👤 Harry Ericson
- 👤 Carl Otto Fredriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:47
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/10; C23G1/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A solution for pickling copper and its alloys which contains 5 - 125 g/l of one or more mineral acids selected from the group consisting of sulphuric acid and phosphoric acid, 2 - 50 g/l hydrogen peroxide, 5 - 100 g/l hydroxy acid selected from the group consisting of citric acid and gluconic acid, and 0.01 - 5 g/l of one or more of the group consisting of benzotriazole and a tertiary amine of the general formula ##STR5## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n 1 and n 2 is less than 30.
Claim 2
Dependent Claim
105 words
A solution for pickling copper and its alloys which contains 5 - 125 g/l of one or more mineral acids selected from the group consisting of sulphuric acid and phosphoric acid, 2 - 50 g/l hydrogen peroxide, 5 - 100 g/l hydroxy acid selected from the group consisting of citric acid and gluconic acid, and 0.01 - 5 g/l of one or more of the group consisting of benzotriazole and a tertiary amine of the general formula ##STR5## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n 1 and n 2 is less than 30.
Claim 3
Dependent Claim
21 words
A solution according to claim 1 in which the hydroxy acid is a citric acid in concentrations of 5 -100 gl.
Claim 4
Dependent Claim
19 words
A solution according to claim 1 which contains 0.01 - 5 g/l aliphatic fatty amine of the formula ##STR6##
Claim 5
Dependent Claim
13 words
A solution according to claim 1 which contains 0.01 -5 g/l of benzotriazole.
Claim 6
Dependent Claim
14 words
A solution according to claim 1 which contains 5 - 125 g/l sulphuric acid.
Claim 7
Dependent Claim
123 words
A process for pickling a surface of copper and its alloys by providing a solution containing 5 - 125 g/l of one or more of the mineral acids selected from the group consisting of sulphuric acid and phosphoric acid, 2 - 50 g/l hydrogen peroxide, 5 - 100 g/l hydroxy acid selected from the group consisting of citric acid and gluconic acid, and 0.01 - 5 g/l of one or more of the group consisting of benzotriazole and a tertiary amine of the general formula ##STR7## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n 1 and n 2 is less than 30, and introducing the surface to be pickled into the solution.
Claim 8
Dependent Claim
123 words
A process for pickling a surface of copper and its alloys by providing a solution containing 5 - 125 g/l of one or more of the mineral acids selected from the group consisting of sulphuric acid and phosphoric acid, 2 - 50 g/l hydrogen peroxide, 5 - 100 g/l hydroxy acid selected from the group consisting of citric acid and gluconic acid, and 0.01 - 5 g/l of one or more of the group consisting of benzotriazole and a tertiary amine of the general formula ##STR7## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n 1 and n 2 is less than 30, and introducing the surface to be pickled into the solution.
Claim 9
Dependent Claim
26 words
The process of claim 6 wherein the surface to be pickled is maintained for 2 to 10 minutes at a temperature of 25° to 35° C.
Claim 10
Dependent Claim
25 words
The process of clain 6 wherein the tertiary amine is present in concentrations of 0.01 - 5 g/l aliphatic fatty amine of the formula ##STR8##
Claim 11
Dependent Claim
25 words
The process of clain 6 wherein the tertiary amine is present in concentrations of 0.01 - 5 g/l aliphatic fatty amine of the formula ##STR8##
References Cited (Backward Citations)
US2318559A
Cited
US2428804A
Cited
US2894905A
Cited
US3345217A
Cited
US3537895A
Cited
US3556883A
Cited
US3809588A
Cited
GB1317445A
Cited
US3770530A
Cited
US3773577A
Cited
US3869401A
Cited
US3905907A
Cited
US3948703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |