Reaction product of nitrogen bases and phosphate esters as corrosion inhibitors

- Baker Hughes Incorporated

A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula ##STR2## and mixtures thereof, wherein R is R.sup.2 .paren open-st.OCH.sub.2 CH.sub.2 .paren close-st..sub.x, wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.

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Claims

2. A method as set forth in claim 1 wherein the agent is a composition of the formula ##STR15## wherein R and R'N are defined in claim 1.

3. A method as set forth in claim 2 wherein R.sup.2 is an unsubstituted alkyl group.

4. A method as set forth in claim 3 wherein the basic nitrogen compound is a compound of the formula ##STR16##

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Patent History
Patent number: RE36291
Type: Grant
Filed: Dec 12, 1995
Date of Patent: Sep 7, 1999
Assignee: Baker Hughes Incorporated (Houston, TX)
Inventor: Richard L. Martin (Sugarland, TX)
Primary Examiner: Nancy Degen
Assistant Examiner: Deanna Baxan
Law Firm: Howell & Haferkamp, L.C.
Application Number: 8/571,041