Cleaning compositions and methods
View Patent ↗The present invention relates, in part, to cleaning methods and solvent cleaning compositions including at least one hydrofluoro-olefin or hydrochlorofluoro-olefin solvent for use in connection with cleaning of metal parts, and in certain preferred embodiments cleaning metal parts to be used in an aircraft.
1. A method of cleaning metal parts to be used in an aircraft comprising:
a. providing a solvent composition comprising at least about 50% by weight of 1-chloro-3,3,3-trifluoropropene (1233zd): and
b. contacting the metal part to be used in an aircraft with said solvent composition, said metal part comprising a metal or a metal alloy selected from titanium and titanium alloys; zinc and zinc alloys; tungsten and tungsten alloys; copper and copper alloys; Inconel-Ni alloys; cadmium and cadmium alloys; stainless steels; gold and gold alloys; and silver and silver alloys.
2. The method of claim 1 wherein said contacting step comprises spraying said metal part with said solvent composition.
3. The method of claim 1 wherein said contacting step comprises immersing said metal part in said solvent composition.
4. The method of claim 1 wherein said solvent composition is in a liquid phase during said immersing step.
5. The method of claim 1 wherein said solvent composition is in a vapor phase during said immersing step.
6. The method of claim 1 wherein said metal part comprises a metal or a metal alloy selected from tungsten carbide, silver braze alloys, and 440C stainless steel.
7. The method of claim 1 wherein said metal part comprises a cadmium plated components or part.
8. The method of claim 2 wherein said solvent composition further comprises methanol.
9. The method of claim 2 wherein said solvent composition further comprises ethanol.
10. The method of claim 8 wherein said ethanol is present in the composition in an amount of from about one to about 10% by weight of the composition.
11. The method of claim 8 wherein said ethanol is present in the composition in an amount of from about one to about 5% by weight of the composition.
12. The method of claim 1 wherein said metal part is contaminated with cutting oil prior to said contacting step.
13. The method of claim 8 wherein said methanol is present in the composition in an amount of from about one to about 10% by weight of the composition.
14. The method of claim 8 wherein said methanol is present in the composition in an amount of from about one to about 5% by weight of the composition.
15. The method of claim 12 wherein at least a portion of said cutting oil is removed by said contacting step.
16. A method of repairing or maintaining an aircraft engine containing metal parts, said method comprising cleaning a metal part of the aircraft engine by steps that include contacting the metal part with a solvent composition comprising at least about 50% by weight of 1-chloro-3,3,3-trifluoropropene (1233zd), said metal part comprising a metal or a metal alloy selected from titanium and titanium alloys; zinc and zinc alloys; tungsten and tungsten alloys; copper and copper alloys; Inconel-Ni alloys; cadmium and cadmium alloys; stainless steels; gold and gold alloys; and silver and silver alloys.
17. The method of claim 1 wherein said solvent composition consists essentially of 1-chloro-3,3,3-trifluoropropene (1233zd).
18. The method of claim 1 wherein said solvent composition consists essentially of trans1-chloro-3,3,3-trifluoropropene (1233zd).