EP0173427A2
Expired / Lapsed
EP
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Corrosion inhibition
Assignee: BetzDearborn Europe Inc
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Filing: 1985-06-24
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Granted: —
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Expires: 2005-06-24
Abstract
Abstract The present invention provides a method of inhibiting the corrosion of non-ferrous metals in contact with an aqueous system, which comprises adding to the aqueous system a sufficient amount for the purpose of a water soluble compound having the formula: wherein R is a hydrocarbon group containing from 3 to about 8 carbon atoms. There may also be present a corrosion inhibitor composition for any ferrous metal present in contact with the aqueous composition.
Inventors
- 👤 Orin Hollander
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:41
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
50 words
A method of inhibiting the corrosion of non-ferrous metals in contact with an aqueous system, which comprises adding to the aqueous system a sufficient amount for the purpose of a water soluble compound having the formula: wherein R is a hydrocarbon group containing from 3 to about 8 carbon atoms.
Claim 2
Independent Claim
50 words
A method of inhibiting the corrosion of non-ferrous metals in contact with an aqueous system, which comprises adding to the aqueous system a sufficient amount for the purpose of a water soluble compound having the formula: wherein R is a hydrocarbon group containing from 3 to about 8 carbon atoms.
Claim 3
Dependent Claim
85 words
: 2. A method of inhibiting the corrosion of metal parts in contact with an aqueous system, the metal parts being composed of both ferrous and non-ferrous metals, which comprises adding to the aqueous system a sufficient amount for the purpose of a corrosion inhibitor composition for the ferrous metal, and also adding to the aqueous system an effective amount for the purpose of a corrosion inhibitor for the non-ferrous metal, the corrosion inhibitor for the non-ferrous metal comprising a compound represented by the formula:
Claim 4
Dependent Claim
85 words
: 2. A method of inhibiting the corrosion of metal parts in contact with an aqueous system, the metal parts being composed of both ferrous and non-ferrous metals, which comprises adding to the aqueous system a sufficient amount for the purpose of a corrosion inhibitor composition for the ferrous metal, and also adding to the aqueous system an effective amount for the purpose of a corrosion inhibitor for the non-ferrous metal, the corrosion inhibitor for the non-ferrous metal comprising a compound represented by the formula:
Claim 5
Dependent Claim
19 words
A method according to claim 1 or 2 wherein R contains from about 4 to about 6 carbon atoms.
Claim 6
Dependent Claim
12 words
A method according to claim 3 wherein R is an alkyl group.
Claim 7
Dependent Claim
15 words
A method according to claim 4 wherein the compound having formula I is a butylbenzotriazole.
Claim 8
Dependent Claim
14 words
A method according to claim 5 wherein the benzotriazole is 4 or 5 butylbenzotriazole.
Claim 9
Independent Claim
38 words
A method according to any of claims 1 to 6, wherein the compound having formula I is added to the aqueous system in an amount of 0.1 to 200 parts per million parts of water in said system.
Claim 10
Dependent Claim
35 words
A method according to claim 7 wherein the compound having formula I is added to the aqueous system in an amount of about 0.1 to 100 parts per million parts of water in said system.
Claim 11
Independent Claim
18 words
A method according to any of claims 1 to 8 wherein the non-ferrous metal is or contains copper.
Claim 12
Independent Claim
19 words
A method according to any of claims 1 to 9 wherein the aqueous system is a cooling water system.
Claim 13
Dependent Claim
42 words
A method according to claim 10 wherein the water contained within the cooling water system and/or the conditions of operation of the aqueous system is or are such as to provide a highly corrosive medium for the copper or copper containing metal.
Claim 14
Dependent Claim
62 words
A composition effective for inhibiting the corrosion of metallic parts or systems composed of both ferrous and non-ferrous metals in contact with water, which composition comprises a corrosion inhibiting composition for the ferrous metals, and a corrosion inhibitor for the non-ferrous metals, comprising a compound of the formula: wherein R is a hydrocarbon group containing about 3 to about 8 carbon atoms.
Claim 15
Dependent Claim
62 words
A composition effective for inhibiting the corrosion of metallic parts or systems composed of both ferrous and non-ferrous metals in contact with water, which composition comprises a corrosion inhibiting composition for the ferrous metals, and a corrosion inhibitor for the non-ferrous metals, comprising a compound of the formula: wherein R is a hydrocarbon group containing about 3 to about 8 carbon atoms.
Claim 16
Dependent Claim
18 words
A composition according to claim 12 wherein said group contains from about 4 to about 6 carbon atoms.
Claim 17
Dependent Claim
13 words
A composition according to claim 13 wherein the group is an alkyl group.
Claim 18
Dependent Claim
19 words
A composition according to claim 14 wherein the corrosion inhibitor for the non-ferrous metal is 4 or 5 butylbenzotriazole.
Claim 19
Dependent Claim
18 words
A composition according to any of claims 12 to 15 wherein the non-ferrous metal is or contains copper.
References Cited (Backward Citations)
No citation records indexed.
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