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US4264378A
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Chromium-free surface treatment
Assignee: GEA Group AG
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Filing: 1980-02-14
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Granted: 1981-04-28
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Expires: 2000-02-14
Abstract
Abstract A chromium-free process for phosphatizing a metal surface provides for applying to the surface an aqueous acidic solution having pH 1.5 to 3.0 and containing phosphate; a metal cation of valence two or greater; molybdate, tungstate, vanadate, niobate or tantalate ions; and drying the solution on the surface without rinsing.
Inventors
- 👤 Dieter Oppen
- 👤 Karl Lampatzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:26
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/40; C23C22/42; C23C22/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
171 words
A process for the preparation of metal surfaces of iron, zinc, or aluminum or their alloys for the subsequent application of organic coatings by applying a phosphate coating by means of wetting with a phosphatizing liquid, containing at least one metal cation of valence two or greater, and subsequent drying in situ of the liquid film, characterized in that the metal surface is wetted with a phosphatizing liquid, which possesses a pH-value of from 1.5 to 3.0, is free from chromium and, apart from metal phosphate, contains at least one ion selected from the group consisting of soluble molybdate, tungstate, vanadate, niobate and tantalate ions wherein the molecular ratio of metal phosphate, calculated as Me n+ (H 2 PO 4 ) n , wherein n is an integer of two or more, to molybdate, tungstate, vanadate, niobate and/or tantalate ion, calculated as MoO 3 , WO 3 , V 2 O 5 , Nb 2 O 5 and Ta 2 O 5 , lies within the range of 1:0.4 to 0.01.
Claim 2
Dependent Claim
171 words
A process for the preparation of metal surfaces of iron, zinc, or aluminum or their alloys for the subsequent application of organic coatings by applying a phosphate coating by means of wetting with a phosphatizing liquid, containing at least one metal cation of valence two or greater, and subsequent drying in situ of the liquid film, characterized in that the metal surface is wetted with a phosphatizing liquid, which possesses a pH-value of from 1.5 to 3.0, is free from chromium and, apart from metal phosphate, contains at least one ion selected from the group consisting of soluble molybdate, tungstate, vanadate, niobate and tantalate ions wherein the molecular ratio of metal phosphate, calculated as Me n+ (H 2 PO 4 ) n , wherein n is an integer of two or more, to molybdate, tungstate, vanadate, niobate and/or tantalate ion, calculated as MoO 3 , WO 3 , V 2 O 5 , Nb 2 O 5 and Ta 2 O 5 , lies within the range of 1:0.4 to 0.01.
Claim 3
Dependent Claim
69 words
The process of claim 1, characterized in that the phosphatizing liquid additionally contains simple or complex-bound fluoride ions wherein the molecular ratio of metal phosphate, calculated as Me n+ (H 2 PO 4 ) n , wherein n is an integer of two or more, to fluoride, calculated as (Me n+ F n+2 ) 2- , wherein n is an integer, lies within the range of 1:0.04 to 2.0.
Claim 4
Dependent Claim
76 words
The process of claim 2, characterized in that the phosphatizing liquid additionally contains finely divided silica wherein the molecular ratio of metal phosphate, calculated as Me n+ (H 2 PO 4 ) n , wherein n is an integer of two or more, to silica, calculated as SiO 2 , to fluoride, calculated as Me n+ F n+2 ) 2- , wherein n is an integer, lies within the range of 1:0.2 to 5.0:0.04 to 2.0.
Claim 5
Dependent Claim
34 words
The process of claim 1, characterized in that the metal cation of valence two or greater is selected from the group consisting of calcium, magnesium, barium, aluminum, zinc, cadmium, iron, nickel, cobalt and manganese.
Claim 6
Dependent Claim
22 words
The process of claim 1, characterized in that the phosphatizing liquid additionally contains at least one reduction equivalent of a reducing substance.
Claim 7
Dependent Claim
45 words
The process of claim 1, characterized in that the phosphatizing liquid additionally contains a dispersible film-forming organic polymer wherein the weight ratio of metal phosphate, calculated as Me n+ (H 2 PO 4 ) n to polymer lies within the range of 1:0.1 to 2.0.
Claim 8
Dependent Claim
37 words
The process of claim 1, characterized in that the film of the phosphatizing liquid is applied in an amount such that, after drying in situ, a coating weight of from 0.03 to 0.6 g/m 2 is obtained.
Claim 9
Dependent Claim
26 words
The process of claim 1, characterized in that the drying in situ of the liquid film is effected at temperatures of between 50° and 100° C.
Claim 10
Dependent Claim
11 words
The process of claim 1, wherein the metal treated is aluminum.
Claim 11
Dependent Claim
19 words
The process of claim 9, wherein the aluminum surface is cleaned with an acidic aqueous solution prior to phosphatizing.
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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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |