US4501667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of inhibiting corrosion of metal surfaces and/or deposition of scale thereon
Assignee: FMC Corp
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Filing: 1984-02-21
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Granted: 1985-02-26
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Expires: 2004-02-21
Abstract
Abstract Process for conditioning metal surfaces to inhibit their corrosion and/or to inhibit scale deposition thereon by treating said surfaces: A. prior to contact with a corrosive or scaling environment, with (i) compound having the formula I: <IMAGE> (I) or a water-soluble salt (or partial ester or -salt) thereof, wherein R1 and R2 are the same or different and each is hydrogen, a C1-C12 straight- or branched chain alkyl group (optionally substituted by one or more hydroxy- and/or carboxyl groups and/or optionally interrupted by one or more oxygen atoms), a C3-C12 straight- or branched chain alkenyl group, a C7-C15 aralkyl group or -CH2PO3H2, or R1 and R2, together with the nitrogen atom to which they are each bonded, may form an optionally-substituted heterocyclic ring; R3 is hydrogen, a C1-C12 straight- or branched chain alkyl group or an optionally substituted C6-C10 aryl group; and R4 is hydrogen or C1-C4 alkyl; and (ii) optionally a metal ion component (b) as hereinafter defined; and/or B. during contact with an aqueous system capable of corroding a metal surface or of depositing scale thereon, with (a) a compound of formula I or a water-soluble salt (or partial salt) thereof; and optionally (b) a metal ion which enhances, synergistically, the metal conditioning effected, individually, by the compound of formula I and the metal ion.
Inventors
- 👤 Barry Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:10
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145; C25; C25D; C25D11/00; C25D11/36
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
19 words
Process for conditioning metal surfaces to inhibit their corrosion and/or to inhibit scale deposition thereon, by treating said surfaces:
Claim 2
Dependent Claim
19 words
Process for conditioning metal surfaces to inhibit their corrosion and/or to inhibit scale deposition thereon, by treating said surfaces:
Claim 3
Dependent Claim
231 words
(A) during contact with an aqueous system capable of corroding said metal surface or of depositing scale thereon, with (i) a compound having the formula (I) ##STR9## or a water-soluble salt (or partialester or -salt) thereof, wherein R 1 and R 2 are the same or different and each is hydrogen, a C 1 -C 12 straight- or branched chain alkyl group (optionally substituted by one or more hydroxy- and/or carboxyl groups and/or optionally interrupted by one or more oxygen atoms), a C 3 -C 12 straight- or branched chain alkenyl group, a C 7 -C 15 aralkyl group, or --CH 2 PO 3 H 2 , or R 1 and R 2 , together with the nitrogen to which they are each bonded, may form an optionally-substituted heterocyclic ring; R 3 is hydrogen, a C 1 -C 12 straight- or branched chain alkyl group or an optionally substituted C 6 -C 10 aryl group; and R 4 is hydrogen or a C 1 -C 4 alkyl group; and optionally (ii) a metal ion (B) during contact with an aqueous system capable of corroding a metal surface or of depositing scale thereon, with (a) a compound of formula I or a water-soluble salt (or partial salt) thereof; and optionally (b) a metal ion which enhances, synergistically, the metal conditioning effected, individually, by the compound of formula I and the metal ion.
Claim 4
Dependent Claim
231 words
(A) during contact with an aqueous system capable of corroding said metal surface or of depositing scale thereon, with (i) a compound having the formula (I) ##STR9## or a water-soluble salt (or partialester or -salt) thereof, wherein R 1 and R 2 are the same or different and each is hydrogen, a C 1 -C 12 straight- or branched chain alkyl group (optionally substituted by one or more hydroxy- and/or carboxyl groups and/or optionally interrupted by one or more oxygen atoms), a C 3 -C 12 straight- or branched chain alkenyl group, a C 7 -C 15 aralkyl group, or --CH 2 PO 3 H 2 , or R 1 and R 2 , together with the nitrogen to which they are each bonded, may form an optionally-substituted heterocyclic ring; R 3 is hydrogen, a C 1 -C 12 straight- or branched chain alkyl group or an optionally substituted C 6 -C 10 aryl group; and R 4 is hydrogen or a C 1 -C 4 alkyl group; and optionally (ii) a metal ion (B) during contact with an aqueous system capable of corroding a metal surface or of depositing scale thereon, with (a) a compound of formula I or a water-soluble salt (or partial salt) thereof; and optionally (b) a metal ion which enhances, synergistically, the metal conditioning effected, individually, by the compound of formula I and the metal ion.
Claim 5
Dependent Claim
29 words
Process according to claim 1 wherein R 1 and R 2 are each hydrogen or C 1 -C 4 alkyl and R 3 and R 4 are each hydrogen.
Claim 6
Dependent Claim
14 words
Process according to claim 1 wherein ferrous, copper, (or their alloys) surfaces are treated.
Claim 7
Dependent Claim
15 words
Process according to claim 1 wherein the metal surface to be treated is cathodically polarised.
Claim 8
Dependent Claim
90 words
A process according to claim 1 wherein the aqueous system is a completely aqueous system and is a cooling water system, an air conditioning system, a steam generating system, a sea-water evaporator, a hydrostatic cooker, a gas scrubbing system or a closed circuit heating or refrigerant system and the inhibitor combination formula I and metal ion, is used in conjunction with one or more of a further corrosion inhibitor, a dispersing and/or threshold agent, a precipitating agent, an oxygen scavenger, a sequestering agent and an anti-foaming agent and a biocide.
Claim 9
Dependent Claim
45 words
A process according to claim 1 wherein the partly aqueous system in an aqueous surface coating composition and the inhibitor combination, formula I and metal ion, is used in conjunction with one or more of a corrosion inhibitor, a biocide, an emulsifier and/or a pigment.
Claim 10
Dependent Claim
47 words
A process according to claim 1 wherein the aqueous system is only partly aqueous and is an aqueous machining fluid and the inhibitor combination, formula I and metal ion, is used in conjunction with one or more of a further corrosion inhibitor and/or an extreme pressure additive.
Claim 11
Dependent Claim
34 words
Process according to claim 1 wherein the metal surface, is contacted with, metal ion selected from, one or more of cobalt, ferrous, barium, calcium, zinc, chromium, nickel, strontium, manganous, cadmium, ceric or magnesium ions.
Claim 12
Dependent Claim
30 words
Process according to claim 1 wherein the ratio of compounds of formula I (or water-soluble salt thereof) to any metal ion is within the range of from 100:1 to 1:100.
Claim 13
Dependent Claim
25 words
Process according to claim 9 wherein the ratio of compounds of formula I (or water-soluble salt thereof) to metal ion is from 10:1 to 1:10.
Claim 14
Dependent Claim
50 words
A process according to claim 1 wherein the inhibitor combination, formula I and metal ion, is used in an aqueous system, in contact with a metal surface which requires corrosion-inhibiting and optionally scale inhibiting protective treatments, in an amount of from 1 to 500 ppm, based on the aqueous system.
Claim 15
Dependent Claim
31 words
A process according to claim 11 wherein the inhibitor combination, formula I and metal ion, is added in an amount of from 1 to 100 ppm based on the aqueous system.
Claim 16
Dependent Claim
45 words
A process according to claim 1 wherein the inhibitor combination, formula I and metal ion, is added to an aqueous system, in contact with a metal surface which requires only a scale-inhibition treatment, in an amount of from 1-200 ppm, based on the aqueous system.
Claim 17
Dependent Claim
35 words
A process according to claim 13 wherein the inhibitor combination, formula I and metal ion, is added to the aqueous system in an amount of from 1 to 30 ppm, based on the aqueous system.
Claim 18
Dependent Claim
50 words
A process according to claim 13 wherein the aqueous system is in contact with a metal surface which requires only a corrosion inhibition system and is an aqueous machining fluid formulation, an aqueous scouring system, an aqueous glycol antifreeze system, a water/glycol hydraulic fluid or a water-based surface coating composition.
Claim 19
Dependent Claim
19 words
A process according to claim 15 wherein the aqueous machining fluid formulation is a water-dilutable cutting- or grinding fluid.
Claim 20
Dependent Claim
59 words
A process according to claim 1 wherein the aqueous system is in contact with a metal surface which requires a combined corrosion inhibition- and anti-scale treatment and is a cooling water system, a steam generating system, a sea-water evaporator, a hydrostatic cooker, a gas scrubbing system, a closed circuit heating system, an aqueous-based refrigeration system or a down-well system.
Claim 21
Dependent Claim
13 words
A process according to claim 7 wherein the further corrosion inhibitor is triethanolamine.
Claim 22
Dependent Claim
32 words
A process according to claim 18 wherein triethanolamine is present in an amount such that the ratio of inhibitor combination, formula I and metal ion, to triethanolamine is from 2:1 to 1:20.
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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |