Corrosion inhibition

• US 5,229,030 A
• Filed: 11/06/1991
• Issued: 07/20/1993
• Est. Priority Date: 11/10/1990
• Status: Expired due to Term

• Current Assignee: BWA Water Additives UK Limited (Italmatch Chemicals S.p.A)
• Original Assignee: FMC Corporation
• Inventors: Rideout, Jan, Clubley, Brian G.
• Primary Examiner(s): Stoll, Robert L.
• Assistant Examiner(s): Fee, Valerie
• Application Number:
  US07/788,689
• Time in Patent Office: 622 Days
• Field of Search: 252/180, 252/389.23, 252/389.22, 422/18, 210/699, 210/700
• US Class Current: 252/389.23
• CPC Class Codes: C23F 11/173 Macromolecular compounds

Abstract

A method of inhibiting corrosion of metal surfaces in contact with an aqueous system, comprising contacting the metal surfaces with a telomer compound having the formula I: ##STR1## in which M is hydrogen or an alkali or alkaline earth metal ion, an ammonium ion or a quaternised amine radical; and n is an average integer ranging from 1 to 60.

Claims

1. A method of inhibiting corrosion of metal surfaces in contact with an aqueous system, comprising contacting the metal surfaces with a telomer compound having the formula I:

##STR6## in which M is hydrogen or an alkali or alkaline earth metal ion, an ammonium ion or a quaternised amine radical; and

n is an average integer ranging from 3 to 40.

2. A method according to claim 1 in which the amount of the telomer of formula I used, or salt thereof, ranges from 0.1 to 50,000 ppm, based on the weight of the aqueous system.

3. A method according to claim 2 in which the amount of the telomer of formula I used, or salt thereof, ranges from 1 to 500 ppm, based on the weight of the aqueous system.

4. A method according to claim 1 in which the aqueous system is that comprised in a cooling water system, a steam generating system, a sea water evaporator, reverse osmosis equipment, a bottle washing plant, paper manufacturing equipment, sugar evaporator equipment, soil irrigation systems, hydrostatic cookers, gas scrubbing systems, closed circuit heating systems, aqueous - based refrigeration systems, down-well systems, or aqueous machining fluid formulations, aqueous scouring systems, aqueous glycol antifreeze systems, water/glycol hydraulic fluids or aqueous - based polymer surface coating systems.

5. A method according to claim 1 in which the compound of formula I is used in conjunction with one or more further corrosion inhibitors;

metal deactivators;

scale inhibitors/dispersing agents;

threshold agents;

precipitating agents;

oxygen scavengers;

sequestering agents;

anti-foaming agents; and

biocides.

6. A method according to claim 1 in which the aqueous system is an aqueous machining fluid formulation.

7. A method according to claim 6 in which the aqueous machining fluid formulation is a water-dilutable cutting or grinding fluid.

8. A method according to claim 6 in which the compound of formula I is used singly or in admixture with a further corrosion inhibitor and/or an extreme-pressure additive.