Selected poly(oxyalkylated) pyrazoles and their use as corrosion inhibitors
AssigneeOlin Corporation
InventorHenry W. Schiessl
Life of this patent
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Abstract
Disclosed are selected poly(oxyalkylated) pyrazoles of the formula: ##STR1## wherein R and R' are independently selected from lower alkyl groups having 1 to 4 carbon atoms; each R" is individually selected from hydrogen and methyl; and n is from 2 to about 20. These compounds are shown to be effective corrosion inhibitors in corrosive liquids such as acids, antifreezes and hydraulic fluids.
Claims27
A poly(oxyalkylated) pyrazole having the formula:
- ##STR4## wherein R and R' are independently selected from lower alkyl groups having from 1 to 4 carbon atoms;
- each R" is individually selected from hydrogen and methyl;
- and n is from 2 to about 20.
A corrosion inhibited antifreeze composition comprising a water-soluble liquid alcohol freezing point depressant and an effective corrosion-inhibiting amount of a poly(oxyalkylated) pyrazole having a formula:
- ##STR5## wherein R and R' are independently selected from lower alkyl groups having from 1 to 4 carbon atoms;
- each R" is individually selected from hydrogen and methyl;
- and n is from 2 to about 20.
An acid metal treating bath comprising an acid and an effective corrosion-inhibiting amount of a poly(oxyalkylated) pyrazole having a formula:
- ##STR6## wherein R and R' are independently selected from lower alkyl groups having from 1 to 4 carbon atoms;
- each R" is individually selected from hydrogen and methyl;
- and n is from 2 to about 20.
A corrosion-inhibited hydraulic fluid composition comprising a base fluid component and an effective corrosion-inhibiting amount of a poly(oxyalkylated) pyrazole having the formula:
- ##STR7## wherein R and R' are independently selected from lower alkyl groups having from 1 to 4 carbon atoms;
- each R" is individually selected from hydrogen and methyl;
- and n is from 2 to about 20.
A process for inhibiting corrosion of metal surfaces caused by corrosive aqueous solutions, which comprises
- contacting said metal with an effective corrosion-inhibiting amount of a poly(oxyalkylated) pyrazole of the formula ##STR8## wherein R and R' are independently selected from lower alkyl groups having 1 to 4 carbon atoms;
- each R" is individually selected from hydrogen and methyl;
- and n is from 2 to about 20.
Dependencies are inferred from the claim text.