US4370177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating solution for metal surfaces
Assignee: Henkel Corp
•
Filing: 1981-10-09
•
Granted: 1983-01-25
•
Expires: 2001-10-09
Abstract
Abstract In an acidic aqueous coating solution which contains zirconium, hafnium or titanium, and fluoride and which is effective in forming on an aluminum surface a non-chromate coating to which overlying coatings adhere tightly and which is corrosion resistant and resists being discolored when subjected to hot water, the improvement comprising including in said coating solution a combination of surfactants in an amount such that a coating formed from the surfactant-containing coating solution has an improved tendency to resist being discolored by hot water.
Inventors
- 👤 Frank J. Frelin
- 👤 Timm L. Kelly
- 👤 Anthony J. Malloy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:05
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/86
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
134 words
An acidic aqueous coating solution which is effective in forming a non-resinous, non-chromate, corrosion-resistant coating on an aluminum surface, said solution consisting essentially of (a) a metal containing substance wherein the metal is selected from the group consisting of zirconium, titanium, and hafnium ions, and mixtures of two or more of said substances, said metal being present in the solution in an amount of at least about 0.5×10 -3 m/l, (b) fluoride in an amount at least sufficient to combine with all of said metal, and (c) at least two surfactants present in amounts such that the coating formed from said solution has an improved tendency to resist being discolored by hot water, and wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1.
Claim 2
Dependent Claim
134 words
An acidic aqueous coating solution which is effective in forming a non-resinous, non-chromate, corrosion-resistant coating on an aluminum surface, said solution consisting essentially of (a) a metal containing substance wherein the metal is selected from the group consisting of zirconium, titanium, and hafnium ions, and mixtures of two or more of said substances, said metal being present in the solution in an amount of at least about 0.5×10 -3 m/l, (b) fluoride in an amount at least sufficient to combine with all of said metal, and (c) at least two surfactants present in amounts such that the coating formed from said solution has an improved tendency to resist being discolored by hot water, and wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1.
Claim 3
Dependent Claim
19 words
The coating solution of claim 1 wherein the total quantity of the surfactants is at least about 10 ppm.
Claim 4
Dependent Claim
37 words
The coating solution of claim 1 having a pH of about 3.5 to about 4.5 and including about 0.75×10 -3 to about 2×10 -3 m/l of zirconium and about 10 ppm to about 500 ppm of surfactants.
Claim 5
Dependent Claim
22 words
The coating solution of claim 3 wherein the amount of fluoride is at least about 4 moles per mole of said metal.
Claim 6
Dependent Claim
19 words
The coating solution of claim 1 including at least about 10 ppm of boron present in a boron-containing substance.
Claim 7
Dependent Claim
22 words
The coating solution of claim 5 wherein the boron is present in an amount of from about 10 to about 200 ppm.
Claim 8
Dependent Claim
8 words
The coating solution of claim 1 including tannin.
Claim 9
Dependent Claim
17 words
The coating solution of claim 1 including one or more of glutaric, ascorbic, maleic, or salicyclic acid.
Claim 10
Dependent Claim
19 words
The coating solution of claim 1 or 5 including a polyhydroxy compound having no more than about 7 carbons.
Claim 11
Dependent Claim
12 words
The coating solution of claim 9 wherein said compound is gluconic acid.
Claim 12
Dependent Claim
124 words
An acidic, aqueous coating solution which is effective in forming a non-resinous, non-chromate, corrosion resistant coating on an aluminum surface, said solution consisting essentially of a zirconium containing substance in an amount of from about 1×10 -3 to about 1.75×10 -3 m/l, at least two surfactants in a total amount of from about 20 to about 100 ppm, wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1, fluoride in an amount of at least about 4 moles per mole of zirconium, and boron, present in a boron-containing substance, in an amount of from about 10 to about 200 ppm, said solution having a pH within the range of about 3.7 to about 4.3.
Claim 13
Dependent Claim
124 words
An acidic, aqueous coating solution which is effective in forming a non-resinous, non-chromate, corrosion resistant coating on an aluminum surface, said solution consisting essentially of a zirconium containing substance in an amount of from about 1×10 -3 to about 1.75×10 -3 m/l, at least two surfactants in a total amount of from about 20 to about 100 ppm, wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1, fluoride in an amount of at least about 4 moles per mole of zirconium, and boron, present in a boron-containing substance, in an amount of from about 10 to about 200 ppm, said solution having a pH within the range of about 3.7 to about 4.3.
Claim 14
Dependent Claim
12 words
The coating solution of claim 11 wherein the surfactants are nonionic surfactants.
Claim 15
Dependent Claim
15 words
The coating solution of claim 11 wherein the source of fluoride is HBF 4 .
Claim 16
Dependent Claim
11 words
The coating solution of claim 12 or 13 including nitric acid.
Claim 17
Dependent Claim
20 words
The coating solution of claim 3 or 11 wherein the source of both the zirconium and fluoride is fluozirconic acid.
Claim 18
Dependent Claim
29 words
A method of coating an aluminum surface comprising contacting the surface with the coating solution of claim 1, 2, 3, 4, 5, 6, 7, 8, 11, 12, or 13.
Claim 19
Dependent Claim
18 words
A method of coating an aluminum surface comprising contacting the surface with the coating solution of claim 9.
Claim 20
Dependent Claim
18 words
A method of coating an aluminum surface comprising contacting the surface with the coating solution of claim 14.
Claim 21
Dependent Claim
18 words
A method of coating an aluminum surface comprising contacting the surface with the coating solution of claim 15.
Claim 22
Dependent Claim
120 words
An acidic aqueous concentrate such that an aqueous coating solution containing about 0.5 to about 10 weight percent of the concentrate is effective in forming a non-resinous, non-chromate, corrosion-resistant coating on an aluminum surface, said aqueous coating solution consisting essentially of: (A) at least about 0.5×10 -3 m/l of one or more of zirconium, titanium, and hafnium metal containing substances; (B) fluoride in an amount at least sufficient to combine with substantially all of the zirconium, titanium, or hafnium to form a complex therewith; and also (C) at least two surfactants in total amount of at least about 10 ppm, wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1.
Claim 23
Dependent Claim
120 words
An acidic aqueous concentrate such that an aqueous coating solution containing about 0.5 to about 10 weight percent of the concentrate is effective in forming a non-resinous, non-chromate, corrosion-resistant coating on an aluminum surface, said aqueous coating solution consisting essentially of: (A) at least about 0.5×10 -3 m/l of one or more of zirconium, titanium, and hafnium metal containing substances; (B) fluoride in an amount at least sufficient to combine with substantially all of the zirconium, titanium, or hafnium to form a complex therewith; and also (C) at least two surfactants in total amount of at least about 10 ppm, wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1.
Claim 24
Dependent Claim
85 words
An aqueous concentrate for replenishing a coating solution of the type defined in claim 1 consisting essentially of: (A) about 0.05 m/l to about 0.5 m/l of one or more of zirconium, titanium, and hafnium metal containing substances; (B) about 0.2 m/l to about 10 m/l of fluoride; and (C) about 1 to about 100 g/l total of a combination of at least two surfactants, wherein when two surfactants are present they are present in a weight ratio of from about 0.3:1 to about 3:1.
References Cited (Backward Citations)
US4054466A
Cited
US4148670A
Cited
US4191596A
Cited
US4191596B1
Cited
US4277292A
Cited
US4313769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |