Corrosion inhibitor compositions and methods of using same
Disclosed herein are phosphoester anticorrosion compositions comprising an adduct of an alkylphenol ethoxylate phosphate ester with 1,3,5,7-tetraazaadamantane. The adducts are storage stable neat or in a solvent. The adducts are suitably added at about 0.5 ppm to 500 ppm by weight or by volume to a water source comprising one or more corrodents to inhibit corrosion of metal surfaces contacting the water source. The phosphoester anticorrosion compositions are as effective or more effective at inhibiting corrosion than conventional sulfur-based corrosion inhibitors when compared on a weight or volume basis.
1. A phosphoester anticorrosion composition comprising an adduct of an alkylphenol ethoxylate phosphate ester with 1,3,5,7-tetraazaadamantane, wherein the alkylphenol ethoxylate phosphate ester comprises one or more structures corresponding to formula I, formula II, or a combination thereof,
wherein each n is independently an integer having a value of between 4 and 20, and each R is independently a C6-C20 linear or branched alkyl.
2. The phosphoester anticorrosion composition of claim 1 wherein the alkylphenol ethoxylate phosphate ester is a mixture of formula I and formula II.
3. The phosphoester anticorrosion composition of claim 1 wherein each R is a C9 linear or branched alkyl.
4. The phosphoester anticorrosion composition of claim 1 wherein the molar ratio of alkylphenol ethoxylate phosphate ester to 1,3,5,7-tetraazaadamantane in the composition is about 1:1.
5. The phosphoester anticorrosion composition of claim 1 further comprising a solvent, wherein the solvent is present in the composition at about 10 wt % to 99 wt %.
6. The phosphoester anticorrosion composition of claim 5 wherein the solvent is selected from water, C 1 -C 6 alkanols, alkoxyalkanols, glycols, glycol ethers, glycol esters and mixtures thereof.
7. A method of making a phosphoester anticorrosion composition, the method comprising:
forming an adduct by combining a alkylphenol ethoxylate phosphate ester with 1,3,5,7-tetraazaadamantane, wherein the alkylphenol ethoxylate phosphate ester comprises one or more structures corresponding to formula I, formula II, or a combination thereof
wherein each n is independently an integer having a value of between 4 and 20, and each R is independently a linear or branched C6-C20 alkyl; and
heating the combination.
8. The method of claim 7 wherein the combining is combining about 1 mole of alkylphenol ethoxylate phosphate ester with about 1 mole of 1,3,5,7-tetraazaadamantane.
9. The method of claim 7 wherein the heating is to a temperature of about 80° C. to 200° C.
10. A treated water source comprising:
a water source comprising one or more corrodents; and
about 0.5 ppm to 500 ppm by volume of the adduct of claim 1 .
11. The treated water source of claim 10 wherein the one or more corrodents comprise hydrogen sulfide, carbon dioxide, oxygen, sodium chloride, calcium chloride, sulfur dioxide, or a mixture of two or more thereof.
12. A method of treating a metal containment, the method comprising:
combining about 0.5 ppm to 500 ppm by volume of the adduct of claim 1 to a water source comprising one or more corrodents to form a treated water source; and
applying the treated water source to the metal containment.
13. The method of claim 12 wherein the method further comprises forming a mixture of the adduct with a solvent prior to the combining, and storing the mixture for 1 day to 10 years after forming and prior to the combining.
14. A treated metal containment comprising:
a metal containment comprising a metal surface; and
the treated water source of claim 10 ,
wherein at least a portion of the metal surface is contacted by the treated water source.
15. The treated metal containment of claim 14 wherein the metal containment is a tank or pipe.
16. The treated metal containment of claim 14 wherein the metal surface comprises carbon steel.