US4828615A
Expired / Lapsed
US
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Process and composition for sealing a conversion coated surface with a solution containing vanadium
Assignee: PPG Industries Inc
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Filing: 1987-03-23
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Granted: 1989-05-09
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Expires: 2007-03-23
Abstract
Abstract A solution containing pentavalent vanadium is applied to a metal surface subsequent to conversion coating. The solution contains pentavalent vanadium ions which may be obtained from a sodium metavanadate or sodium metavanadate/orthovanadate solution that is acidified with an acid. Vanadium pentoxide may be dissolved in a base such as sodium hydroxide, potassium hydroxide or lithium hydroxide to form a basic concentrate which can be acidified conveniently after dilution. In one disclosed embodiment, the solution comprises vanadium pentoxide, sodium hydroxide, nitric acid and water which is applied to a phosphate conversion coated surface than rinsed with deionized water prior to priming and painting.
Inventors
- 👤 Thomas W. Cape
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:56
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
157 words
An aqueous solution for rinsing metal surfaces subsequent to a conversion coating, consisting essentially of an aqueous solution including pentavalent vanadium formed from at least one liquid concentrate which when combined in a working bath contains: (a) from 10 to 100 parts per million a vanadium-containing compound selected from the group consisting of vanadium pentoxide, alkali metal vanadate, ammonium vanadate, vandium pentafluoride, vanadium oxytrichloride, vanadyl-containing species, vanadium tetroxide, vanadium tetrachloride, vanadium tetrafluoride, vanadium trichloride, vanadium dichloride, and vanadium metal; (b) an alkali selected from the group consisting of alkali metal hydroxide, alkali metal oxide, and ammonium hydroxide; and (c) an acid selected from the group consisting of nitric acid, phosphoric acid, sulfuric acid, hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, fluoroboric acid, fluosilicic acid, mono-fluorophosphoric acid, hexafluorophosphoric acid, fluorosulfuric acid, perchloric acid, perbromic acid, periodic acid, phytic acid, carboxylic acid and sulfonic acid, and wherein the aqueous solution has a pH of about 4 to 4.5.
Claim 2
Dependent Claim
157 words
An aqueous solution for rinsing metal surfaces subsequent to a conversion coating, consisting essentially of an aqueous solution including pentavalent vanadium formed from at least one liquid concentrate which when combined in a working bath contains: (a) from 10 to 100 parts per million a vanadium-containing compound selected from the group consisting of vanadium pentoxide, alkali metal vanadate, ammonium vanadate, vandium pentafluoride, vanadium oxytrichloride, vanadyl-containing species, vanadium tetroxide, vanadium tetrachloride, vanadium tetrafluoride, vanadium trichloride, vanadium dichloride, and vanadium metal; (b) an alkali selected from the group consisting of alkali metal hydroxide, alkali metal oxide, and ammonium hydroxide; and (c) an acid selected from the group consisting of nitric acid, phosphoric acid, sulfuric acid, hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, fluoroboric acid, fluosilicic acid, mono-fluorophosphoric acid, hexafluorophosphoric acid, fluorosulfuric acid, perchloric acid, perbromic acid, periodic acid, phytic acid, carboxylic acid and sulfonic acid, and wherein the aqueous solution has a pH of about 4 to 4.5.
Claim 3
Dependent Claim
40 words
An aqueous solution for sealing metal surfaces subsequent to a conversion coating as recited in claim 1 consisting essentially of, in weight percent: ______________________________________
0.0018 to 0.18% Vanadium Pentoxide
0.0008 to 1.0% Sodium Hydroxide
0.0010 to 1.0% Nitric Acid.
______________________________________
Claim 4
Dependent Claim
46 words
An aqueous solution for sealing metal surfaces subsequent to a conversion coating as recited in claim 1 consisting essentially of, in weight percent: ______________________________________
0.005 to 0.04% Vanadium Pentoxide
0.004 to 0.045% Sodium Hydroxide
0.005 to 0.05% Nitric Acid
0.001 to 0.005% Hydrogen Peroxide (30%).
______________________________________
Claim 5
Dependent Claim
33 words
An aqueous solution for sealing metal surfaces subsequent to a conversion coating as recited in claim1 consisting essentially of, in weight percent: ______________________________________
0.018% Vanadium Pentoxide
0.001875% Sodium Hydroxide
0.0118% Nitric Acid.
______________________________________
Claim 6
Dependent Claim
40 words
An aqueous solution for sealing metal surfaces subsequent to a conversion coating as recited in claim 1 consisting essentially of, in weight percent: ______________________________________
0.0018 to 0.18% Vanadium Pentoxide
0.0008 to 1.0% Sodium Hydroxide
0.0010 to 1.0% Ammonium Bifluoride.
______________________________________
Claim 7
Dependent Claim
46 words
An aqueous solution for sealing metal surfaces subsequent to a conversion coating as recited in claim 5 consisting essentially of, in weight percent: ______________________________________
0.005 to 0.04% Vanadium Pentoxide
0.004 to 0.045% Sodium Hydroxide
0.005 to 0.05% Ammonium Bifluoride
0.001 to 0.005% Hydrogen Peroxide (30%).
______________________________________
Claim 8
Dependent Claim
34 words
An aqueous solution for sealing metal surfaces subsequent to a conversion coating as recited in claim 1 consisting essentially of, in weight percent: ______________________________________
0.018% Vanadium Pentoxide
0.001875% Sodium Hydroxide
0.0117% Ammonium Bifluoride.
______________________________________
Claim 9
Dependent Claim
106 words
A concentrate for making an aqueous solution for the treatment of conversion coated metal surfaces, said aqueous solution having pentavalent vanadium ions, said concentrate comprising: (a) a first aqueous solution consisting essentially of alkali metal hydroxide, and from 10 to 1000 parts per million vanadium pentoxide, said first solution being diluted with water to form a working bath; and (b) a second aqueous solution consisting essentially of at least one member selected from the group consisting of nitric acid, ammonium bifluoride, and glycolic acid, said second solution being added to said working bath to lower the pH of the working bath to about 4 to 4.5.
Claim 10
Dependent Claim
106 words
A concentrate for making an aqueous solution for the treatment of conversion coated metal surfaces, said aqueous solution having pentavalent vanadium ions, said concentrate comprising: (a) a first aqueous solution consisting essentially of alkali metal hydroxide, and from 10 to 1000 parts per million vanadium pentoxide, said first solution being diluted with water to form a working bath; and (b) a second aqueous solution consisting essentially of at least one member selected from the group consisting of nitric acid, ammonium bifluoride, and glycolic acid, said second solution being added to said working bath to lower the pH of the working bath to about 4 to 4.5.
Claim 11
Dependent Claim
31 words
The concentrate of claim 8 wherein said first solution is diluted on a volume to volume basis at a ratio of from 1 part per 80 to 1 part per 8000.
Claim 12
Dependent Claim
30 words
The concentrate of claim 8 wherein said first solution is diluted on a volume to volume basis at a ratio of from 1 part per 180 to 1 part 1600.
Claim 13
Dependent Claim
26 words
The concentrate of claim 8 wherein said first solution is diluted on a volume to volume basis at a ratio of about 1 part per 800.
Claim 14
Dependent Claim
37 words
The concentrate of claim 8 wherein said first solution comprises consisting essentially of, in weight percent: 12.8% vanadium pentoxide, 6.2% sodium hydroxide, 0.8% hydrogen peroxide, 80.1% water; and said second solution comprises: 31.2% nitric acid 68.8% water.
Claim 15
Dependent Claim
24 words
The concentrate of claim 8 wherein said first solution consisting essentially of, in weight percent: 12.8% vanadium pentoxide, 6.2% sodium hydroxide, 0.8% hydrogen peroxide,
Claim 16
Dependent Claim
12 words
1% water; and said second solution comprises: 31.3% ammonium bifluoride 68.7% water.
Claim 17
Dependent Claim
12 words
1% water; and said second solution comprises: 31.3% ammonium bifluoride 68.7% water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |