US4731128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of copper from corrosion
Assignee: International Business Machines Corp
•
Filing: 1987-05-21
•
Granted: 1988-03-15
•
Expires: 2007-05-21
Abstract
Abstract Copper is protected from corrosion by contacting the copper with a first azole and then contacting the copper with a second and different azole. The chemical reactivity of the first azole with copper must be greater than the reactivity of the second and different azole with copper. Also, the absorbency of the second azole on copper must be greater than the absorbency of the first azole on the copper.
Inventors
- 👤 Frank J. Casullo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:38
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/282; H05K2203/00; H05K2203/05; H05K2203/0562; H05K2203/0591; H05K2203/12; H05K2203/122; H05K2203/124; H05K2203/14; H05K2203/1476
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A method for protecting copper from corrosion which comprises: (a) contacting a copper-containing surface with a first azole to form a first layer thereon; and (b) contacting the copper from step (a) with a second and different azole; wherein the first azole chemically reacts more readily with copper than does the second and different azole with copper; and wherein the adsorbency of the second and different azole on copper is greater than the adsorbency of the first azole.
Claim 2
Independent Claim
78 words
A method for protecting copper from corrosion which comprises: (a) contacting a copper-containing surface with a first azole to form a first layer thereon; and (b) contacting the copper from step (a) with a second and different azole; wherein the first azole chemically reacts more readily with copper than does the second and different azole with copper; and wherein the adsorbency of the second and different azole on copper is greater than the adsorbency of the first azole.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein aqueous compositions of the first and second azoles are employed.
Claim 4
Dependent Claim
50 words
The method of claim 1 wherein the first azole is employed as an aqueous solution containing about 0.5 g/l to about 5 g/l of the first azole and wherein the second azole is employed as an aqueous solution containing about 0.5 g/l to about 5 g/l of the second azole.
Claim 5
Dependent Claim
45 words
The method of claim 1 wherein the first azole is employed as an aqueous solution containing about 1.5 g/l to about 3 g/l of azole and the second azole is employed as an aqueous solution containing about 0.5 g/l to about 3 g/l of azole.
Claim 6
Dependent Claim
37 words
The method of claim 1 wherein the contracting with the first azole is from about 0.5 minute to about 10 minutes and the contacting with the second azole is from about 0.5 minute to about 10 minutes.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein the contacting with the first azole is from about 1.5 minutes to about 3 minutes and the contacting with the second azole is from about 0.5 minute to about 5 minutes.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein the treatment with the first azole and the second azole is carried out at temperatures from about normal ambient temperatures to about 100° C.
Claim 9
Dependent Claim
27 words
The method of claim 1 wherein the contacting with the first azole and the second azole is carried out at about 58° C. to about 62° C.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein said first azole exhibits a basic pH and said second and different azole exhibits an acidic pH.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein said first azole is imidazole and said second azole is benzotriazole.
Claim 12
Dependent Claim
18 words
The method of claim 1 which further includes precleaning the copper prior to contacting with the first azole.
Claim 13
Dependent Claim
30 words
The method of claim 11 wherein said pretreating comprises contacting with an aqueous sodium persulfate solution followed by an aqueous hydrochloric acid solution, followed by an aqueous sodium carbonate solution.
Claim 14
Dependent Claim
9 words
A product obtained by the method of claim 1.
References Cited (Backward Citations)
US3531414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |