Anti-corrosion formulations that are stable during storage
View Patent ↗The present invention relates to formulations for inhibiting the corrosion of the metals used in the oil industry, and more generally in all types of industries for drilling for fossil compounds or ores, such as gas or oil. The corrosion-inhibiting formulations are stable during storage, and have improved properties due to the presence of at least one compound having at least one triazine unit. The invention also relates to the use of at least one compound comprising at least one triazine unit in a corrosion-inhibiting formulation, as well as to the use of said corrosion-inhibiting formulation in the oil, gas and mining industry.
1. A corrosion-inhibiting formulation comprising:
a) at least one amine or amine derivative,
b) at least one sulfur compound,
c) at least one compound bearing at least one triazine unit, and
d) optionally a solvent or a mixture of two or more solvents,
wherein component b) is selected from the group consisting of compounds bearing at least one —SH group and at least one carboxylic acid (—COOH) and/or alcohol (—OH) group.
2. The formulation as claimed in claim 1 , wherein component a) is selected from the group consisting of amines, ethoxylated amines, amino acids, imidazolines, and also derivatives thereof and salts thereof, fatty amines, fatty amine derivatives, imidazolines substituted with at least one fatty chain, ester amines, ether amines, alkylamines, oxy-alkylated amines, betaines and alkylbetaines, and also N-oxide derivatives of the abovementioned amines.
3. The formulation as claimed in claim 1 , wherein component b) is selected from the group consisting of mercaptoethanol, mercaptopropanol, thioglycolic acid, mercaptoacetic acid, and mercaptopropionic acid.
4. The formulation as claimed in claim 1 , wherein component c) is selected from the group consisting of the compounds of formula (1) below:
in which:
R 1 , R 2 and R 3 , which may be identical or different, are chosen, independently of each other, from a hydrogen atom, a linear or branched alkyl radical comprising from 1 to 6 carbon atoms and optionally substituted with one or more units chosen from hydroxyl (—OH) and alkoxy (—OR), where R represents a linear or branched alkyl radical comprising from 1 to 6 carbon atoms, and
R a , R b and R c , which may be identical or different, are chosen, independently of each other, from a hydrogen atom and a linear or branched alkyl radical comprising from 1 to 6 carbon atoms.
5. The formulation as claimed in claim 4 , wherein component c) is selected from the group consisting of the compounds of formula (1) for which R a , R b and R c each represent a hydrogen atom and R 1 , R 2 and R 3 are not hydrogen atoms.
6. The formulation as claimed in claim 4 , wherein component c) is selected from the group consisting of the compounds of formula (1) for which R 1 , R 2 and R 3 are identical.
7. The formulation as claimed in claim 4 , wherein component (c) is selected from the group consisting of the compounds of formula (1) for which R 1 , R 2 and R 3 are identical and are each selected from the group consisting of a methyl radical, a hydroxyethyl radical and a methoxypropyl radical.
8. The formulation as claimed in claim 1 , wherein the amount of component c) is between 0.5% by weight and 10% by weight, relative to the total weight of the formulation.
9. The formulation as claimed in claim 1 , wherein the compound comprising at least one triazine unit is selected from the group consisting of 1,3,5-trimethylhexahydrotriazine, 1,3,5-tris(hydroxyethyl)hexahydrotriazine and 1,3,5-tri(methoxypropyl)hexahydrotriazine.
10. The formulation as claimed in claim 1 , additionally comprising a component d) which is a solvent or a mixture of two or more solvents.
11. The formulation as claimed in claim 1 , wherein the solvent(s) is (are) selected from the group consisting of water and water-soluble organic solvents.
12. The formulation as claimed in claim 1 , wherein the amount of component c) is between 0.5% and 5% by weight.
13. The formulation as claimed in claim 1 , wherein component c) is a compound bearing only one triazine unit.
14. The formulation as claimed in claim 13 , wherein the triazine unit is a hexahydrotriazine unit.
15. The formulation as claimed in claim 13 , wherein the triazine unit is a 1,3,5-triazine unit.
16. The formulation as claimed in claim 1 , wherein component a) represents from 50% to 90% by weight, limits inclusive, relative to the total weight of components a)+b)+c), component b) represents from 1% to 30% by weight, limits inclusive, relative to the total weight of components a)+b)+c), and component c represents from 0.5% to 15 by weight, limits inclusive, relative to the total weight of components a)+b)+c).
17. A method for treating the corrosion of metal conduits that are corrodable on contact with corrosive media in the oil, gas and mining industry, wherein the method comprises using a corrosion-inhibiting formulation in accordance with claim 1 .