US4548787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous liquids containing metal cavitation-erosion corrosion inhibitors
Assignee: BASF Corp
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Filing: 1983-02-09
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Granted: 1985-10-22
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Expires: 2003-02-09
Abstract
Abstract Compositions for inhibiting mineral scale and the corrosion of metals particularly the cavitation corrosion of aluminum in the presence of aqueous liquids are disclosed. The combination of a water-soluble phosphate with at least one of a water-soluble molybdate, tungstate, or selenate is disclosed as providing a synergistic protective effect against the cavitation corrosion of aluminum in aqueous liquids.
Inventors
- 👤 Joe C. Wilson
- 👤 Stanley T. Hirozawa
- 👤 John J. Conville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:26
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/125; C02F5/086; C23; C23F; C23F11/00; C23F11/08; C23F11/18
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
77 words
A composition for inhibiting mineral scale and the corrosion of metals in the presence of an aqueous liquid and particularly the cavitation-erosion corrosion of aluminum comprising parts based on 100 parts by weight of said aqueous liquid from about: (A) 0.5 to 2 parts by weight of a water-soluble hydrogen phosphate, (B) 0.001 to 0.5 parts by weight of a water-soluble molybdate, tungstate, or selenate, and (C) 0.1 to 0.8 parts by weight of a siloxane-silicate copolymer.
Claim 2
Dependent Claim
77 words
A composition for inhibiting mineral scale and the corrosion of metals in the presence of an aqueous liquid and particularly the cavitation-erosion corrosion of aluminum comprising parts based on 100 parts by weight of said aqueous liquid from about: (A) 0.5 to 2 parts by weight of a water-soluble hydrogen phosphate, (B) 0.001 to 0.5 parts by weight of a water-soluble molybdate, tungstate, or selenate, and (C) 0.1 to 0.8 parts by weight of a siloxane-silicate copolymer.
Claim 3
Dependent Claim
41 words
The composition of claim 1 additionally comprising in parts based on 100 parts by weight of said aqueous liquid (A) 0.1 to 0.5 parts by weight of an azole and (B) 0.2 to 0.8 parts by weight of a water-soluble nitrate.
Claim 4
Dependent Claim
18 words
The composition of claim 2 wherein said molybdate, tungstate, and selenate are alkali metal or ammonium salts thereof.
Claim 5
Dependent Claim
16 words
The composition of claim 3 wherein said water-soluble phosphate and nitrate are alkali metal salts thereof.
Claim 6
Dependent Claim
20 words
The composition of claim 4 wherein said azole is selected from at least one of the group mercaptobenzothiazole and tolyltriazole.
Claim 7
Dependent Claim
14 words
The composition of claim 5 wherein said mercaptobenzothiazole and tolyltriazole are alkali metal salts.
Claim 8
Dependent Claim
24 words
The composition of claim 6 wherein said siloxane-silicate copolymer is at least one of the group selected from phosphonate siloxane-silicate and sulfonate siloxane-silicate copolymers.
Claim 9
Dependent Claim
58 words
A corrosion inhibiting alcohol-based antifreeze concentrate adapted to inhibit the corrosion of metals in contact with aqueous liquids, especially cavitation-erosion corrosion of aluminum, comprising a water-miscible glycol, 0.001 to 0.50 parts by weight of a water-soluble molybdate, tungstate, or selenate, and metal corrosion inhibiting amounts of a siloxane-silicate copolymer, water-soluble nitrate, water-soluble azole, and a water-soluble hydrogen phosphate.
Claim 10
Dependent Claim
58 words
A corrosion inhibiting alcohol-based antifreeze concentrate adapted to inhibit the corrosion of metals in contact with aqueous liquids, especially cavitation-erosion corrosion of aluminum, comprising a water-miscible glycol, 0.001 to 0.50 parts by weight of a water-soluble molybdate, tungstate, or selenate, and metal corrosion inhibiting amounts of a siloxane-silicate copolymer, water-soluble nitrate, water-soluble azole, and a water-soluble hydrogen phosphate.
Claim 11
Dependent Claim
33 words
The concentrate of claim 8 wherein said nitrate, azole and phosphate are alkali metal salts and said water-miscible glycol has from 1 to 4 carbon atoms and from 1 to 3 hydroxy groups.
Claim 12
Dependent Claim
35 words
The concentrate of claim 9 wherein said azole is selected from at least one of the group consisting of an alkali metal mercaptobenzothiozole and an alkali metal tolyltriazole and said water-miscible glycol comprises ethylene glycol.
Claim 13
Dependent Claim
36 words
The concentrate of claim 10 wherein said molybdate is an alkali metal molybdate and said siloxane-silicate copolymer is selected from at least one of the group consisting of a phosphonate siloxane-silicate and a sulfonate siloxane-silicate copolymer.
Claim 14
Dependent Claim
85 words
A process for inhibiting mineral scale and corrosion of metal in the presence of aqueous liquids and especially for inhibiting cavitation-erosion corrosion of aluminum comprising adding to said aqueous liquid the following parts based upon 100 parts by weight of said aqueous liquid from about: (A) 0.5 to 2 parts by weight of a water-soluble hydrogen phosphate, (B) 0.001 to 0.50 parts by weight of a water-soluble molybdate, tungstate, or selenate, and (C) a 0.1 part to 0.8 parts by weight of a siloxane-silicate copolymer.
Claim 15
Dependent Claim
85 words
A process for inhibiting mineral scale and corrosion of metal in the presence of aqueous liquids and especially for inhibiting cavitation-erosion corrosion of aluminum comprising adding to said aqueous liquid the following parts based upon 100 parts by weight of said aqueous liquid from about: (A) 0.5 to 2 parts by weight of a water-soluble hydrogen phosphate, (B) 0.001 to 0.50 parts by weight of a water-soluble molybdate, tungstate, or selenate, and (C) a 0.1 part to 0.8 parts by weight of a siloxane-silicate copolymer.
Claim 16
Dependent Claim
41 words
The process of claim 12 additionally comprising in parts based on 100 parts by weight of said aqueous system (A) 0.1 to 0.50 parts by weight of an azole and (B) 0.2 to 0.8 parts by weight of a water-soluble nitrate.
Claim 17
Dependent Claim
16 words
The process of claim 13 wherein said molybdate, tungstate, and selenate are alkali metal salts thereof.
Claim 18
Dependent Claim
17 words
The process of claim 14 wherein said water-soluble hydrogen phosphate and nitrate are alkali metal salts thereof.
Claim 19
Dependent Claim
20 words
The process of claim 15 wherein said azole is at least one of the group selected from mercaptobenzothiazole and tolyltriazole.
Claim 20
Dependent Claim
14 words
The process of claim 16 wherein said mercaptobenzothiazole and tolyltriazole are alkali metal salts.
Claim 21
Dependent Claim
24 words
The process of claim 17 wherein said siloxane-silicate copolymer is at least one of the group selected from phosphonate siloxane-silicate and sulfonate siloxane-silicate copolymers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |