US4148670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating solution for metal surface
Assignee: Henkel Corp
•
Filing: 1976-12-30
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Granted: 1979-04-10
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Expires: 1996-12-30
Abstract
Abstract An acidic aqueous coating solution for forming on an aluminum surface a coating which is corrosion resistant and to which overlying coatings adhere excellently is disclosed. The coating solution contains compounds of zirconium and/or titanium, fluoride and phosphate in dissolved form, and optionally, polyhydroxy compounds having 6 or fewer carbon atoms. The coating solution is capable of forming on an aluminum surface a uniformly colorless and clear coating so that the coated surface has the appearance of the underlying metal surface, that is, the coating can be formed without changing the appearance of the metal surface.
Inventors
- 👤 Timm L. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:49
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36; C23C22/361; C23C22/86
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
122 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and having a pH within the range of about 1.5 to about 4.0 and consisting essentially of at least about 10 ppm of zirconium or titanium or a mixture thereof, at least about 10 ppm of phosphate and available fluoride, the amounts and proportions thereof being such that said solution is capable, in the presence of dissolved aluminum, of forming on an aluminum surface a uniformly clear and colorless coating and providing a coated surface which resists blackening after the coated surface is subjected to boiling water for a 2 minute period, and wherein said solution includes dissolved aluminum and is substantially free of solids which tend to precipitate.
Claim 2
Dependent Claim
122 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and having a pH within the range of about 1.5 to about 4.0 and consisting essentially of at least about 10 ppm of zirconium or titanium or a mixture thereof, at least about 10 ppm of phosphate and available fluoride, the amounts and proportions thereof being such that said solution is capable, in the presence of dissolved aluminum, of forming on an aluminum surface a uniformly clear and colorless coating and providing a coated surface which resists blackening after the coated surface is subjected to boiling water for a 2 minute period, and wherein said solution includes dissolved aluminum and is substantially free of solids which tend to precipitate.
Claim 3
Dependent Claim
14 words
A coating solution according to claim 1 including up to 1000 ppm of phosphate.
Claim 4
Dependent Claim
19 words
A coating solution according to claim 1 wherein the available fluoride concentration is no greater than about 500 ppm.
Claim 5
Dependent Claim
23 words
A coating solution according to claim 1 wherein the pH of the solution is within the range of about 2.6 to about 3.1.
Claim 6
Dependent Claim
23 words
A coating solution according to claim 1 including fluoboric acid in an amount within the range of about 8 to about 200 ppm.
Claim 7
Dependent Claim
23 words
A coating solution according to claim 1 including at least 40 ppm of a polyhydroxy compound having no more than 6 carbon atoms.
Claim 8
Dependent Claim
30 words
A coating solution according to claim 6 wherein said polyhydroxy compound is selected from the group consisting of gluconic acid and salts thereof, sorbitol, mannitol, dextrose, ethylene glycol and glycerine.
Claim 9
Dependent Claim
17 words
A coating solution according to claim 6 including up to about 1000 ppm of said polyhydroxy compound.
Claim 10
Dependent Claim
50 words
A coating solution according to claim 1 having a pH within the range of about 2.6 to about 3.1 and comprising: (A) about 45 to about 125 ppm of zirconium; (B) about 50 to about 200 ppm of phosphate; and (C) about 10 to about 200 ppm of available fluoride.
Claim 11
Dependent Claim
67 words
A coating solution according to claim 9 wherein the source of said zirconium is ammonium fluozirconate, the source of said phosphate is phosphoric acid, the source of said available fluoride includes HF and including nitric acid in an amount, as needed, to impart said pH to said solution, about 8 to about 200 ppm of fluoboric acid and about 40 to about 400 ppm of gluconic acid.
Claim 12
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 10.
Claim 13
Dependent Claim
21 words
A process for coating aluminum having a bright shiny surface comprising contacting said surface with the coating solution of claim 9.
Claim 14
Dependent Claim
14 words
A process according to claim 12 wherein said solution is sprayed on said surface.
Claim 15
Dependent Claim
23 words
A process according to claim 13 wherein the temperature of said solution is within the range of about 80 to about 110° F.
Claim 16
Dependent Claim
14 words
A process according to claim 13, including subjecting the coated surface to pasteurizing conditions.
Claim 17
Dependent Claim
16 words
A coating solution according to claim 1 wherein the source of said zirconium is a fluozirconate.
Claim 18
Dependent Claim
16 words
A coating solution according to claim 1 wherein the source of said phosphate is phosphoric acid.
Claim 19
Dependent Claim
24 words
A coating solution according to claim 1 including nitric acid in an amount sufficient to impart to said solution a pH within said range.
Claim 20
Dependent Claim
18 words
A process for coating an aluminum surface comprising contacting the surface with the coating solution of claim 1.
Claim 21
Dependent Claim
33 words
A process for coating aluminum comprising contacting said aluminum with a coating solution according to claim 1 and forming thereon a coating having a weight of about 2 to about 20 mg/sq. ft.
Claim 22
Dependent Claim
20 words
A process according to claim 20 wherein the weight of coating formed is about 5 to about 10 mg/sq. ft.
Claim 23
Dependent Claim
90 words
An aqueous concentration such that an aqueous coating solution containing about 0.5 to about 10 weight percent of the concentrate is effective in forming a non-chromate coating on aluminum, has a pH within the range of about 1.5 to about 4.0 and consists essentially of: (A) at least about 10 ppm of zirconium or titanium or a mixture thereof; (B) about 10 ppm to about 1000 ppm of phosphate; and (C) fluoride in an amount at least sufficient to form a complex with substantially all of said zirconium and/or titanium.
Claim 24
Dependent Claim
90 words
An aqueous concentration such that an aqueous coating solution containing about 0.5 to about 10 weight percent of the concentrate is effective in forming a non-chromate coating on aluminum, has a pH within the range of about 1.5 to about 4.0 and consists essentially of: (A) at least about 10 ppm of zirconium or titanium or a mixture thereof; (B) about 10 ppm to about 1000 ppm of phosphate; and (C) fluoride in an amount at least sufficient to form a complex with substantially all of said zirconium and/or titanium.
Claim 25
Dependent Claim
83 words
An aqueous concentrate according to claim 21 wherein said coating solution has a pH within the range of about 2.6 to about 3.1 and consists essentially of: (A) about 45 to about 125 ppm of zirconium; (B) about 50 to about 200 ppm of phosphate; (C) about 8 to about 200 ppm of HBF 4 ; (d) about 10 to about 50 ppm of HF; and (E) nitric acid in an amount such that the pH of said solution is within said range.
Claim 26
Dependent Claim
63 words
An aqueous concentrate substantially free of precipitate for replenishing the coating solution of claim 1 consisting essentially of: (A) about 5 to about 10 g/l of zirconium or about 2.5 to about 5 g/l of Ti; (B) about 5 to about 10 g/l of phosphate; and (C) a material which is a source of about 5 to about 20 g/l of available fluoride.
Claim 27
Dependent Claim
21 words
A concentrate according to claim 24 wherein said source of available fluoride is HF or ammonium bifluoride or a mixture thereof.
Claim 28
Dependent Claim
108 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and consisting essentially of: (A) about 20 to about 65 ppm of titanium; (B) about 50 to about 200 ppm of phosphate; and (C) about 10 to about 200 ppm of available fluoride; wherein said solution is capable, in the presence of dissolved aluminum, of forming on an aluminum surface a uniformly clear and colorless coating and providing a coated surface which resists blackening after the coated surface is subjected to boiling water for a 2 minute period, and wherein said solution includes dissolved aluminum and is substantially free of solids which tend to precipitate.
Claim 29
Dependent Claim
108 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and consisting essentially of: (A) about 20 to about 65 ppm of titanium; (B) about 50 to about 200 ppm of phosphate; and (C) about 10 to about 200 ppm of available fluoride; wherein said solution is capable, in the presence of dissolved aluminum, of forming on an aluminum surface a uniformly clear and colorless coating and providing a coated surface which resists blackening after the coated surface is subjected to boiling water for a 2 minute period, and wherein said solution includes dissolved aluminum and is substantially free of solids which tend to precipitate.
Claim 30
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 26.
Claim 31
Dependent Claim
68 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and having a pH within the range of about 1.5 to about 4.0 and consisting essentially of: (A) about 10 to about 125 ppm of zirconium; (B) about 10 to about 1000 ppm of phosphate; and (C) about 10 to about 500 ppm of available fluoride; wherein said coating solution is substantially free of precipitate.
Claim 32
Dependent Claim
68 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and having a pH within the range of about 1.5 to about 4.0 and consisting essentially of: (A) about 10 to about 125 ppm of zirconium; (B) about 10 to about 1000 ppm of phosphate; and (C) about 10 to about 500 ppm of available fluoride; wherein said coating solution is substantially free of precipitate.
Claim 33
Dependent Claim
37 words
A solution according to claim 28 wherein the source of said zirconium is ammonium fluozirconate, wherein the source of said phosphate is phosphoric acid and the source of said available fluoride is HF or NH 4 F.HF.
Claim 34
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 29.
Claim 35
Dependent Claim
16 words
A solution according to claim 28 including about 8 to about 200 ppm of fluoboric acid.
Claim 36
Dependent Claim
16 words
A solution according to claim 31 including about 40 to about 400 ppm of gluconic acid.
Claim 37
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 31.
Claim 38
Dependent Claim
51 words
A coating solution according to claim 28 having a pH within the range of about 2.6 to about 3.1 and consisting essentially of: (A) about 45 to about 125 ppm of zirconium; (B) about 50 to about 200 ppm of phosphate; (C) about 10 to about 200 ppm of available fluoride.
Claim 39
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 34.
Claim 40
Dependent Claim
37 words
A solution according to claim 34 wherein the source of said zirconium is ammonium fluozirconate, wherein the source of said phosphate is phosphoric acid and the source of said available fluoride is HF or NH 4 F.HF.
Claim 41
Dependent Claim
16 words
A solution according to claim 36 including about 8 to about 200 ppm of fluoboric acid.
Claim 42
Dependent Claim
16 words
A solution according to claim 37 including about 40 to about 400 ppm of gluconic acid.
Claim 43
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 38.
Claim 44
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 37.
Claim 45
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 36.
Claim 46
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 28.
Claim 47
Dependent Claim
87 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and having a pH within the range of about 1.5 to about 4.0 and consisting essentially of: (A) at least about 10 ppm of zirconium; (B) about 10 to about 1000 ppm of phosphate; and (C) about 10 to about 500 ppm of available fluoride; wherein the amount of zirconium in the solution is not in excess of its solubility limit in the solution, and wherein said coating solution is substantially free of precipitate.
Claim 48
Dependent Claim
87 words
An acidic aqueous coating solution effective in forming a non-chromate coating on aluminum and having a pH within the range of about 1.5 to about 4.0 and consisting essentially of: (A) at least about 10 ppm of zirconium; (B) about 10 to about 1000 ppm of phosphate; and (C) about 10 to about 500 ppm of available fluoride; wherein the amount of zirconium in the solution is not in excess of its solubility limit in the solution, and wherein said coating solution is substantially free of precipitate.
Claim 49
Dependent Claim
23 words
A process for coating an aluminum surface having a bright shiny appearance comprising contacting the surface with the coating solution of claim 43.
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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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |