US4338140A
Expired / Lapsed
US
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Coating composition and method
Assignee: Occidental Chemical Corp
•
Filing: 1980-07-14
•
Granted: 1982-07-06
•
Expires: 2000-07-14
Abstract
Abstract An aqueous acidic composition provides improved corrosion resistance to a metal, e.g., ferrous, zinc or aluminum surface upon contact. The composition contains dissolved hafnium and/or zirconium, fluoride, preferably a vegetable tannin compound, and optionally phosphate ions.
Inventors
- 👤 Gary A. Reghi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:13
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36; C23C22/361
Claims Analysis
Total Claims: 85
Claim 1
Independent Claim
44 words
An acidic aqueous chromium-free composition of pH value less than 5 containing in dissolved form hafnium, fluoride and a vegetable tannin in amounts, at least 1 ppm of each, sufficient, when contacted with a metal surface, to impart corrosion resistance to the metal surface.
Claim 2
Dependent Claim
44 words
An acidic aqueous chromium-free composition of pH value less than 5 containing in dissolved form hafnium, fluoride and a vegetable tannin in amounts, at least 1 ppm of each, sufficient, when contacted with a metal surface, to impart corrosion resistance to the metal surface.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the hafnium concentration is from 4 to 110 ppm.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the fluoride is present in a weight ratio of F:Hf of at least 0.64:1.
Claim 5
Dependent Claim
13 words
The composition of claim 1 additionally containing nitric acid or a nitrate compound.
Claim 6
Dependent Claim
10 words
The composition of claim 1 additionally containing a phosphate compound.
Claim 7
Dependent Claim
14 words
The composition of claim 5 wherein the phosphate concentration is at least 10 ppm.
Claim 8
Dependent Claim
14 words
The composition of claim 1 wherein the tannin concentration is at least 25 ppm.
Claim 9
Dependent Claim
13 words
The composition of claim 1 additionally containing citric acid or a citrate compound.
Claim 10
Dependent Claim
10 words
The composition of claim 1 additionally containing a zirconium compound.
Claim 11
Dependent Claim
13 words
The composition of claim 9 wherein the hafnium concentration exceeds the zirconium concentration.
Claim 12
Dependent Claim
10 words
The composition of claim 1 additionally containing a titanium compound.
Claim 13
Dependent Claim
13 words
The composition of claim 11 wherein the hafnium concentration exceeds the titanium concentration.
Claim 14
Dependent Claim
10 words
The composition of claim 1 additionally containing a lithium compound.
Claim 15
Dependent Claim
10 words
The composition of claim 1 additionally containing a resin compound.
Claim 16
Dependent Claim
16 words
The composition of claim 1 additionally containing at least one acid or alkaline pH adjusting compound.
Claim 17
Dependent Claim
54 words
A chromium-free process for forming a corrosion resistant paint receptive coating on a metal surface comprising contacting the surface with an aqueous acidic composition of pH value less than 5 containing at least 1 ppm of both dissolved hafnium and fluoride for a time and at a temperature sufficient to produce a coating thereon.
Claim 18
Dependent Claim
54 words
A chromium-free process for forming a corrosion resistant paint receptive coating on a metal surface comprising contacting the surface with an aqueous acidic composition of pH value less than 5 containing at least 1 ppm of both dissolved hafnium and fluoride for a time and at a temperature sufficient to produce a coating thereon.
Claim 19
Dependent Claim
13 words
The process of claim 16 wherein the pH value is less than 3.5.
Claim 20
Dependent Claim
14 words
The process of claim 16 wherein the pH value is not less than 2.
Claim 21
Dependent Claim
15 words
The process of claim 16 wherein the hafnium concentration is from 4 to 100 ppm.
Claim 22
Dependent Claim
20 words
The process of claim 16 wherein the fluoride is present in a weight ratio of F:Hf of at least 0.64:1.
Claim 23
Dependent Claim
10 words
The process of claim 16 additionally containing a phosphate compound.
Claim 24
Dependent Claim
14 words
The process of claim 16 wherein the composition additionally contains a vegetable tannin compound.
Claim 25
Dependent Claim
14 words
The process of claim 16 wherein the tannin concentration is at least 1 ppm.
Claim 26
Dependent Claim
12 words
The process of claim 16 wherein the composition additionally contains dissolved zirconium.
Claim 27
Dependent Claim
12 words
The process of claim 16 wherein the composition additionally contains dissolved titanium.
Claim 28
Dependent Claim
21 words
The process of claim 16 wherein the metal surface treated is selected from the group consisting of ferrous, zinc and aluminum.
Claim 29
Dependent Claim
17 words
The process of claim 16 wherein the time of contact is from 0.1 seconds to 10 minutes.
Claim 30
Dependent Claim
18 words
The process of claim 27 wherein the time of contact is from about 2 seconds to 1 minute.
Claim 31
Dependent Claim
25 words
The process of claim 16 wherein the temperature of the solution is at least 70° F. and less than the boiling point of the solution.
Claim 32
Dependent Claim
15 words
The process of claim 29 wherein the temperature is between about 100° and 160° F.
Claim 33
Dependent Claim
27 words
A process for imparting corrosion resistance to metal surface comprising contacting the surface with the composition of claim 1 and thereafter applying a paint to the surface.
Claim 34
Dependent Claim
58 words
An acidic aqueous chromium-free composition of pH value less than 5 containing in dissolved form phosphate ions in an amount of about 10 up to about 200 ppm and zirconium, fluroide and a vegetable tannin in amounts, at least 1 ppm of each, sufficient, when contacted with a metal surface, to impart corrosion resistance to the metal surface.
Claim 35
Dependent Claim
58 words
An acidic aqueous chromium-free composition of pH value less than 5 containing in dissolved form phosphate ions in an amount of about 10 up to about 200 ppm and zirconium, fluroide and a vegetable tannin in amounts, at least 1 ppm of each, sufficient, when contacted with a metal surface, to impart corrosion resistance to the metal surface.
Claim 36
Dependent Claim
21 words
The composition of claim 32 in which said zirconium is present in an amount of about 4 to about 100 ppm.
Claim 37
Dependent Claim
21 words
The composition of claim 32 in which said fluoride is present in a weight ratio of F:Zr of at least 1.25:1.
Claim 38
Dependent Claim
21 words
The composition of claim 34 in which said zirconium is present in an amount of about 4 to about 100 ppm.
Claim 39
Dependent Claim
27 words
The composition of claim 34 in which said tannin is present in an amount of at least 25 ppm calculated as a weight equivalent to tannic acid.
Claim 40
Dependent Claim
27 words
The composition of claim 34 in which said tannin is present in an amount up to about 500 ppm calculated as a weight equivalent to tannic acid.
Claim 41
Dependent Claim
22 words
The composition of claim 34 in which said phosphate ions are present in an amount of about 25 to about 75 ppm.
Claim 42
Dependent Claim
22 words
The composition of claim 34 in which said phosphate ions are present in an amount of about 45 to about 55 ppm.
Claim 43
Dependent Claim
44 words
The composition of claim 34 containing about 50 ppm zirconium, about 180 ppm total fluoride, about 70 ppm tannin calculated on a weight equivalent to tannic acid, about 50 ppm phosphate ions, said composition of a pH value of about 3 to about 4.5.
Claim 44
Dependent Claim
9 words
The composition of claim 34 additionally containing nitrate ions.
Claim 45
Dependent Claim
10 words
The composition of claim 34 additionally containing a titanium compound.
Claim 46
Dependent Claim
10 words
The composition of claim 34 additionally containing a lithium compound.
Claim 47
Dependent Claim
10 words
The composition of claim 34 additionally containing a boron compound.
Claim 48
Dependent Claim
13 words
The composition of claim 44 in which said boron compound comprises fluorboric acid.
Claim 49
Dependent Claim
31 words
The composition of claim 34 additionally containing a sequestering agent present in an amount sufficient to complex at least a portion of the hard water salts including calcium, magnesium and iron.
Claim 50
Dependent Claim
12 words
The composition of claim 46 in which said sequestering agent comprises EDTA.
Claim 51
Dependent Claim
31 words
The composition of claim 34 additionally containing phosphate ions in an amount of about 10 to about 200 ppm and fluoride ions in an amount to provide a controlled free-fluoride concentration.
Claim 52
Dependent Claim
55 words
A process for forming a corrosion resistant coating on a metal surface which comprises the steps of contacting the surface with an aqueous acidic composition as defined in any one of claims 35 through 37 and 38 through 48 at a temperature and for a period of time sufficient to produce the desired coating thereon.
Claim 53
Dependent Claim
27 words
The composition of claim 32 in which said tannin is present in an amount of at least 25 ppm calculated as a weight equivalent to tannic acid.
Claim 54
Dependent Claim
27 words
The composition of claim 32 in which said tannin is present in an amount up to about 500 ppm calculated as a weight equivalent to tannic acid.
Claim 55
Dependent Claim
22 words
The composition of claim 32 in which said phosphate ions are present in an amount of about 25 to about 75 ppm.
Claim 56
Dependent Claim
22 words
The composition of claim 32 in which said phosphate ions are present in an amount of about 45 to about 55 ppm.
Claim 57
Dependent Claim
44 words
The composition of claim 32 containing about 50 ppm zirconium, about 180 ppm total fluoride, about 70 ppm tannin calculated on a weight equivalent to tannic acid, about 50 ppm phosphate ions, said composition of a pH value of about 3 to about 4.5.
Claim 58
Dependent Claim
9 words
The composition of claim 32 additionally containing nitrate ions.
Claim 59
Dependent Claim
10 words
The composition of claim 32 additionally containing a titanium compound.
Claim 60
Dependent Claim
10 words
The composition of claim 32 additionally containing a lithium compound.
Claim 61
Dependent Claim
10 words
The composition of claim 32 additionally containing a boron compound.
Claim 62
Dependent Claim
13 words
The composition of claim 58 in which said boron compound comprises fluoboric acid.
Claim 63
Dependent Claim
31 words
The composition of claim 32 additionally containing a sequestering agent present in an amount sufficient to complex at least a portion of the hard water salts including calcium, magnesium and iron.
Claim 64
Dependent Claim
12 words
The composition of claim 60 in which said sequestering agent comprises EDTA.
Claim 65
Dependent Claim
31 words
The composition of claim 32 additionally containing phosphate ions in an amount of about 10 to about 200 ppm and fluoride ions in an amount to provide a controlled free-fluoride concentration.
Claim 66
Dependent Claim
76 words
A process for forming a corrosion resistant coating on a metal surface which comprises the steps of contacting the surface with an aqueous acidic composition as defined in claim 32 or 33 or 34 or 50 or 51 or 52 or 53 or 54 or 55 or 56 or 57 or 58 or 59 or 60 or 61 or 62 at a temperature and for a period of time sufficient to produce the desired coating thereon.
Claim 67
Dependent Claim
46 words
An acidic aqueous chromium-free composition of pH value of about 3 to about 4.5 containing in dissolved form zirconium, fluoride and a vegetable tannin amounts, at least 1 ppm of each, sufficient, when contacted with a metal surface, to impart corrosion resistance to the metal surface.
Claim 68
Dependent Claim
46 words
An acidic aqueous chromium-free composition of pH value of about 3 to about 4.5 containing in dissolved form zirconium, fluoride and a vegetable tannin amounts, at least 1 ppm of each, sufficient, when contacted with a metal surface, to impart corrosion resistance to the metal surface.
Claim 69
Dependent Claim
21 words
The composition of claim 64 in which said zirconium is present in an amount of about 4 to about 100 ppm.
Claim 70
Dependent Claim
21 words
The composition of claim 64 in which said fluoride is present in a weight ratio of F:Zr of at least 1.25:1.
Claim 71
Dependent Claim
27 words
The composition of claim 64 in which said tannin is present in an amount of at least 25 ppm calculated as a weight equivalent to tannic acid.
Claim 72
Dependent Claim
27 words
The composition of claim 64 in which said tannin is present in an amount up to about 500 ppm calculated as a weight equivalent to tannic acid.
Claim 73
Dependent Claim
19 words
The composition of claim 64 additionally containing phosphate ions in an amount of about 10 to about 200 ppm.
Claim 74
Dependent Claim
22 words
The composition of claim 69 in which said phosphate ions are present in an amount of about 25 to about 75 ppm.
Claim 75
Dependent Claim
22 words
The composition of claim 69 in which said phosphate ions are present in an amount of about 45 to about 55 ppm.
Claim 76
Dependent Claim
44 words
The composition of claim 69 containing about 50 ppm zirconium, about 180 ppm total fluoride, about 70 ppm tannin calculated on a weight equivalent to tannic acid, about 50 ppm phosphate ions, said composition of a pH value of about 3 to about 4.5.
Claim 77
Dependent Claim
9 words
The composition of claim 64 additionally containing nitrate ions.
Claim 78
Dependent Claim
10 words
The composition of claim 64 additionally containing a titanium compound.
Claim 79
Dependent Claim
10 words
The composition of claim 64 additionally containing a lithium compound.
Claim 80
Dependent Claim
10 words
The composition of claim 64 additionally containing a boron compound.
Claim 81
Dependent Claim
13 words
The composition of claim 76 in which said boron compound comprises fluoboric acid.
Claim 82
Dependent Claim
31 words
The composition of claim 64 additionally containing a sequestering agent present in an amount sufficient to complex at least a portion of the hard water salts including calcium, magnesium and iron.
Claim 83
Dependent Claim
12 words
The composition of claim 78 in which said sequestering agent comprises EDTA.
Claim 84
Dependent Claim
31 words
The composition of claim 64 additionally containing phosphate ions in an amount of about 10 to about 200 ppm and fluoride ions in an amount to provide a controlled free-fluoride concentration.
Claim 85
Dependent Claim
51 words
A process for forming a corrosion resistant coating on a metal surface which comprises the steps of contacting the surface with an aqueous acidic composition as defined in any one of claims 64 through 80 at a temperature and for a period of time sufficient to produce the desired coating thereon.
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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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |