Corrosion inhibition system

Claim 2

An oil-dispersible corrosion inhibiting solution comprising about 0.25% to about 10% by weight of an ethoxylated tertiary amine in a solvent, said amine represented by the formula ##STR3## wherein x is about 9 to about 11 and the sum of (y+z) is about 2 to about 50.

Claim 3

The corrosion inhibiting solution of claim 1, further comprising an organic inhibitor formed by the reaction of a mineral acid with an amide.

Claim 4

The corrosion inhibiting solution of claim 1, further comprising an organic inhibitor formed by the reaction of an organic acid predominantly having about 2 to about 20 carbon atoms per carboxylic acid group with one or more amides.

Claim 5

The corrosion inhibiting solution of claim 3 wherein the amide is mixed with an amine selected from the group consisting of an aliphatic polyamine, aromatic amine, alkoxylated aliphatic amine, alkoxylated aromatic amine, amine oxide, alkoxylated amine oxide and imidazoline, prior to reaction with the organic acid.

Claim 6

The corrosion inhibiting solution of claim 4, wherein the polyamine is cocoamine, tallowamine or soyamine.

Claim 7

The corrosion inhibiting solution of claim 3, wherein said organic acid is a mixture of organic acids predominantly having about 2 to about 20 carbon atoms per carboxylic acid group.

Claim 8

The corrosion inhibiting solution of claim 3, wherein the organic acid is a fatty acid, an oxyacid or a dimer-trimer acid.

Claim 9

The corrosion inhibiting solution of claim 3, wherein one amide is the reaction product of a fatty acid having about 10 to about 20 carbon atoms, and an alkoxylated amine.

Claim 10

The corrosion inhibiting solution of claim 8, wherein the alkoxylated amine is a diamine having an average molecular weight of about 200 to about 250.

Claim 11

The corrosion inhibiting solution of claim 8, wherein said one amide is mixed with an alkyl amidoamine prior to reaction with said organic acid.

Claim 12

The corrosion inhibiting solution of claim 3, wherein the organic acid is reacted with one or more amides at about 60° to about 100° C.

Claim 13

The corrosion inhibiting solution of claim 11, wherein the time of reaction is about 1 to 3 hours.

Claim 14

The corrosion inhibiting solution of claim 3, wherein the amount of organic acid reacted with the amide is about 75% to about 130% of the stoichiometric amount needed to react with the amide.

Claim 15

The corrosion inhibiting solution of claim 3, wherein the organic inhibitor comprises about 20% to about 35% by weight of the corrosion inhibiting solution.

Claim 16

The corrosion inhibiting solution of claim 1 wherein a low molecular weight alcohol is employed as a solvent.

Claim 17

The corrosion inhibiting solution of claim 15, wherein the low molecular weight alcohol is methanol, ethanol, propanol, isopropanol, butanol, isobutanol or pentanol.

Claim 18

The corrosion inhibiting solution of claim 1 wherein a mixture of a low molecular weight alcohol and water is employed as a solvent.

Claim 19

The corrosion inhibiting solution of claim 1, wherein an aromatic hydrocarbon solvent is employed.

Claim 20

The corrosion inhibiting solution of claim 3, wherein about 60% to about 80% by weight of the corrosion inhibiting solution is solvent.

Claim 21

The corrosion inhibiting solution of claim 1, further comprising an organic inhibitor formed by the reaction of a dimer-trimer acid with an alkyl amidoamine.

Claim 22

The corrosion inhibiting solution of claim 20, wherein said reaction occurs in an aromatic hydrocarbon solvent environment.

Claim 23

The corrosion inhibiting solution of claim 20, wherein an aromatic hydrocarbon solvent is employed.

Claim 24

An oil-dispersible corrosion inhibiting solution comprising: about 1% to about 10% by weight of an ethoxylated tertiary amine, represented by the formula ##STR4## wherein x is about 9 to about 11 and the sum of (y+z) is about 2 to about 50; about 65% to about 75% by weight of about a one to one mixture of a low molecular weight alcohol and water and about 25% to about 35% by weight of an organic inhibitor formed by the reaction of about a one to one mixture of an amide and an alkyl amidoamine with about 100% to about 120% of the stoichiometric amount of a mixture of organic acids needed to neutralize the amide and amidoamine mixture at a temperature of about 75° to about 95° C. for about one to about two hours, said amide formed by the reaction of an ethoxylated diamine with a fatty acid having about 15 to 20 carbon atoms per carboxylic acid group; said mixture of organic acids being approximately a three to two to one mixture of a fatty acid having about 15 to 20 carbon atoms per carboxylic acid group, an oxyacid, and a dimer-trimer acid having about 15 to 20 carbon atoms per carboxylic acid group, respectively.

Claim 25

An oil-dispersible corrosion inhibiting solution comprising: about 1% to about 10% by weight of an ethoxylated tertiary amine, represented by the formula ##STR4## wherein x is about 9 to about 11 and the sum of (y+z) is about 2 to about 50; about 65% to about 75% by weight of about a one to one mixture of a low molecular weight alcohol and water and about 25% to about 35% by weight of an organic inhibitor formed by the reaction of about a one to one mixture of an amide and an alkyl amidoamine with about 100% to about 120% of the stoichiometric amount of a mixture of organic acids needed to neutralize the amide and amidoamine mixture at a temperature of about 75° to about 95° C. for about one to about two hours, said amide formed by the reaction of an ethoxylated diamine with a fatty acid having about 15 to 20 carbon atoms per carboxylic acid group; said mixture of organic acids being approximately a three to two to one mixture of a fatty acid having about 15 to 20 carbon atoms per carboxylic acid group, an oxyacid, and a dimer-trimer acid having about 15 to 20 carbon atoms per carboxylic acid group, respectively.

Claim 26

The corrosion inhibiting solution of claim 23, wherein the proportion of oxy acid in the mixture of organic acid is varied to vary the dispersion properties of the corrosion inhibiting solution.

Claim 27

An oil dispersible corrosion inhibiting solution, comprising: about 1% to about 10% by weight of an ethoxylated tertiary amine represented by the formula ##STR5## wherein x is about 9 to about 11 and the sum of (y+z) is about 2 to about 50; about 65% to about 75% by weight for an aromatic hydrocarbon solvent; and about 25% to about 35% by weight of an organic inhibitor formed by the reaction of a dimer-trimer acid and a nitrogen compound selected from the group consisting of imidazolines and alkyl amidoamines at a temperature of about 75% to about 100° C. for about one-half to about two hours in an aromatic solvent environment.

Claim 28

An oil dispersible corrosion inhibiting solution, comprising: about 1% to about 10% by weight of an ethoxylated tertiary amine represented by the formula ##STR5## wherein x is about 9 to about 11 and the sum of (y+z) is about 2 to about 50; about 65% to about 75% by weight for an aromatic hydrocarbon solvent; and about 25% to about 35% by weight of an organic inhibitor formed by the reaction of a dimer-trimer acid and a nitrogen compound selected from the group consisting of imidazolines and alkyl amidoamines at a temperature of about 75% to about 100° C. for about one-half to about two hours in an aromatic solvent environment.

Claim 31

The method of claim 26 wherein said solution is mixed with fluids so that a concentration of about 10 ppm to about 200 ppm of said solution continuously contacts the metal.

Claim 32

The method of claim 26, further including the steps of: contacting the metal to be protected with said solution for a time sufficient to form a durable film over the surface of the metal, preferably at least 12 hours; and repeating the film-forming metal contact treatment when necessary to maintain the film.