Method of inhibiting corrosion using a composition of quaternary ammonium salts containing non-halogen anions
View Patent ↗Disclosed are quaternary ammonium carbonates, bicarbonates, and mixtures thereof as anti-corrosive agents. The invention relates to a method for inhibiting the corrosion of metal surfaces by applying a composition containing one or more quaternary ammonium carbonate or bicarbonate. The disclosure is also directed to anti-corrosive coating for metal substrates containing these compounds, to metal substrates having these anticorrosive coatings, and to aqueous cleaning solutions containing these compounds.
1. A method for inhibiting corrosion of a metal substrate comprising the step of contacting the substrate with a composition comprising:
(a) a quaternary ammonium carbonate, wherein the quaternary ammonium carbonate is didecyldimethylammonium carbonate, didecyldimethylammonium bicarbonate or mixtures thereof; and
(b) optionally, a solvent.
2. The method claim 1 , wherein the composition further comprises a surfactant selected from the group consisting of amine oxides, linear alcohol ethoxylates, secondary alcohol ethoxylates, ethoxylate ethers, betaines, fatty acids containing from 6 to 22 carbon atoms, salts of fatty acids containing from 6 to 22 carbon atoms, and mixtures thereof.
3. The method of claim 2 , wherein the surfactant is nonylphenol ethoxylate.
4. The method of claim 1 , wherein the metal substrate is in an oil environment.
5. The method of claim 4 , wherein oil environment comprises a petroleum distillate.
6. The method of claim 5 , wherein the petroleum distillate is selected from the group consisting of kerosene, white spirit, hydrocarbon fractions, and mixtures thereof.
7. The method of claim 1 , wherein the composition further comprises at least one ingredient selected from the group consisting of builders, colorants, perfumes and fragrances.
8. The method of claim 1 , wherein the metal substrate is selected from the group consisting of steel, cast iron, aluminum, metal alloys and combinations thereof.
9. The method of claim 1 , wherein the solvent is a polar solvent selected from the group consisting of water, water-miscible polar solvents, and mixtures thereof.
10. The method of claim 9 , wherein the composition is an anti-corrosive cleaning solution and the metal substrate is being cleaned with said solution.
11. The method of claim 1 , wherein the composition is an anti-corrosive metalworking fluid, and wherein the metal substrate is a metal to be worked and the solvent is water or a water-oil mixture.
12. The method of claim 9 , wherein the metal substrate is a metal powder in a powder metallurgy process.
13. A method for anti-corrosive cleaning of a metal substrate comprising the step of contacting the metal substrate with a composition comprising:
(a) at least one quaternary ammonium compound, wherein the at least one quaternary ammonium compound is didecyldimethylammonium carbonate, didecyldimethylammonium bicarbonate or mixtures thereof; and
(b) a solvent.
14. A method for metalworking using an anti-corrosive fluid comprising the step of contacting the metal being worked with a composition comprising:
(a) at least one quaternary ammonium compound, wherein the at least one quaternary ammonium compound is didecyldimethylammonium carbonate, didecyldimethylammonium bicarbonate or mixtures thereof; and
(b) a solvent.
15. A method for inhibiting corrosion in a powder metallurgy process comprising the step of contacting a metal powder with a composition comprising:
(a) at least one quaternary ammonium compound, wherein the at least one quaternary ammonium compound is didecyldimethylammonium carbonate, didecyldimethylammonium bicarbonate or mixtures thereof; and
(b) a solvent.