US3895969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing surface for synthetic resin coating compositions
Assignee: J M ELTZROTH AND ASSOCIATES IN
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Filing: 1973-06-13
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Granted: 1975-07-22
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Expires: 1993-06-13
Abstract
Abstract Compositions and a process are provided for inhibiting corrosion of non-ferrous metal surfaces and for producing a surface to which synthetic resin coating compositions will adhere so that the resultant coatings have satisfactory impact and bending resistance, together with resistance to creeping corrosion between the metal and the dried resin coating.
Inventors
- 👤 Russell C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/51; C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A PROCESS FOR TREATING NON-FERROUS METAL SURFACED ARTICLES TO IMPROVE CORROSION RESISTANCE AND RECEPIVITY TO SYNTHETIC RESIN COATINGS WHICH COMPRISES BRINGING SAID ARTICLES INTO CONTACT WITH A CHROMATE DEPOSITING SOLUTION CONTAINING AS ESSENTIAL COMPONENTS HEXAVALENT CHROMIUM AND TRIVALENT CHROMIUM TOGETHER WITH AN ACID FROM THE GROUP CONSISTING OF FLUOBROIC ACID, FLUOSILICIC ACID, HYDROFLUORIC ACID AND MIXTURES THEREOF IN SUFFICIENT AMOUNT TO ENCHANCE ADHERNCY OF THE RESULTANT SURFACE TO ORGANIC FILM FORMING POLYMERS WHICH DRY TO A WATER RESISTANT COATING, SAID CHROMATE DEPOSITING SOLUTION HAVING A SOLIDS CONTENT WITHIN THE RANGE FROM 0.2 GRAM PER LITER TO 75.0 GRAMS PER LITER, THE REMAINDER BEING WATER, AND CONSISTING ESSENTIALLY OF THE FOLLOWING:
Claim 2
Dependent Claim
110 words
A PROCESS FOR TREATING NON-FERROUS METAL SURFACED ARTICLES TO IMPROVE CORROSION RESISTANCE AND RECEPIVITY TO SYNTHETIC RESIN COATINGS WHICH COMPRISES BRINGING SAID ARTICLES INTO CONTACT WITH A CHROMATE DEPOSITING SOLUTION CONTAINING AS ESSENTIAL COMPONENTS HEXAVALENT CHROMIUM AND TRIVALENT CHROMIUM TOGETHER WITH AN ACID FROM THE GROUP CONSISTING OF FLUOBROIC ACID, FLUOSILICIC ACID, HYDROFLUORIC ACID AND MIXTURES THEREOF IN SUFFICIENT AMOUNT TO ENCHANCE ADHERNCY OF THE RESULTANT SURFACE TO ORGANIC FILM FORMING POLYMERS WHICH DRY TO A WATER RESISTANT COATING, SAID CHROMATE DEPOSITING SOLUTION HAVING A SOLIDS CONTENT WITHIN THE RANGE FROM 0.2 GRAM PER LITER TO 75.0 GRAMS PER LITER, THE REMAINDER BEING WATER, AND CONSISTING ESSENTIALLY OF THE FOLLOWING:
Claim 3
Dependent Claim
75 words
A process as claimed in claim 1 in which said non-ferrous metal surfaced articles are in the form of sheets, coils, wires, tubes or rods which are brought into contact with said chromate depositing solution at a linear speed of at least 100 feet per minute and the pH of said solution is within the range of 1.5 to 2.5, the said solution being effective to deposit at least 0.2 mg/sq.ft. of chromate as chromium.
Claim 4
Dependent Claim
37 words
A process as claimed in claim 1 in which said non-ferrous metal surfaced articles are from the group consisting of zinc, aluminum, magnesium, aluminized and galvanized iron and steel, zinc-aluminum alloys, magnesium-aluminum alloys, copper and copper alloys.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 in which the weight ratio of trivalent chromium as Cr to hexavalent chromium as Cr does not exceed 50:1.
Claim 6
Dependent Claim
33 words
A process as claimed in claim 1 in which the resultant non-ferrous metal surfaced article is coated with a coating containing an organic film forming polymer which dries to a water resistant coating.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 4 in which said polymer is an arcylic resin.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 1 in which said chromate depositing composition consists essentially of an aqueous solution of the following:
Claim 9
Dependent Claim
30 words
A process as claimed in claim 7 in which said reducing agent consists essentially of sodium sulfite and sodium nitrite each in proportions of 0.05 to 0.2 gram per liter.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 1 in which the treatment of metal surfaced articles is carried out for a period of from 1 to 30 seconds.
Claim 11
Dependent Claim
36 words
A process as claimed in claim 1 in which the weight ratio of trivalent chromium as Cr to hexavalent chromium as Cr in the chromate depositing solution is within the range of approximately 1:1 to 2:1.
Claim 12
Dependent Claim
41 words
A process as claimed in claim 1 in which said process is carried out continuously and said solution is replenished periodically by adding chromic acid and a substance from the group consisting of fluoboric acid, hydrofluoric acid, water and mixtures thereof.
Claim 13
Dependent Claim
76 words
A process as claimed in claim 1 in which said process is carried out continuously and said solution is replenished periodically by adding chromic acid, and a substance from the group consisting of fluoboric acid, hydrofluoric acid, water and mixtures thereof, the weight ratio of chromic acid to fluoboric acid added being within the range of 3:1 to 1:3, and the ratio of fluoboric acid to hydrofluoric acid being in the range of 10:1 to 1:10.
Claim 14
Dependent Claim
33 words
A process as claiMed in claim 1 wherein said chromate depositing solution contains hard water including precipitatable salts and a sufficeint amount of an additive to nullify the adverse effect of such salts.
Claim 15
Dependent Claim
14 words
A process as claimed in claim 13 in which said additive is sulfuric acid.
Claim 16
Dependent Claim
21 words
A process as claimed in claim 1 in which the applied chromate conversion coating contains 30 to 60% by weight Cr.
Claim 17
Dependent Claim
12 words
A non-ferrous metal surfaced article resulting from the process of claim 1.
Claim 18
Dependent Claim
27 words
An article as claimed in claim 16 containing a paint coating, said article being capable of withstanding 1000 hours of salt spray under ASTM B117-64 test conditions.
References Cited (Backward Citations)
US2795518A
Cited
US3098775A
Cited
US3404046A
Cited
US3380858A
Cited
US3391031A
Cited
US3501352A
Cited
US3505129A
Cited
US3755018A
Cited
US3752707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |