Method for removing engine deposits from turbine components and composition for use in same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C23G-001/02
출원번호
US-0020291
(2004-12-27)
발명자
/ 주소
Powers,John Matthew
Brooks,William Clarke
출원인 / 주소
General Electric Company
대리인 / 주소
Jagtiani &
인용정보
피인용 횟수 :
3인용 특허 :
18
초록▼
A method and cleaning composition for removing engine deposits from turbine components, in particular turbine disks and turbine shafts. This method comprises the following steps: (a) providing a turbine component having a surface with engine deposits thereon, wherein the turbine component comprises
A method and cleaning composition for removing engine deposits from turbine components, in particular turbine disks and turbine shafts. This method comprises the following steps: (a) providing a turbine component having a surface with engine deposits thereon, wherein the turbine component comprises a nickel and/or cobalt-containing base metal; and (b) treating the surface of the turbine component with a cleaning composition to convert the engine deposits thereon to a removable smut without substantially etching the base metal of the turbine component. The cleaning composition comprises an aqueous solution that is substantially free of acetic acid and comprising: a nitrate ion source in an amount, by weight of the nitrate ion, of from about 470 to about 710 grams/liter; and a bifluoride ion source in an amount, by weight of the bifluoride ion, of from about 0.5 to about 15 grams/liter. The smut that is formed can be removed from the surface of the turbine component in a manner that does not substantially alter the surface thereof.
대표청구항▼
What is claimed is: 1. A method comprising the following steps: (a) providing a turbine component having a surface with engine deposits formed thereon during operation of a gas turbine engine, wherein the turbine component comprises a nickel and/or cobalt-containing base metal; and (b) treating the
What is claimed is: 1. A method comprising the following steps: (a) providing a turbine component having a surface with engine deposits formed thereon during operation of a gas turbine engine, wherein the turbine component comprises a nickel and/or cobalt-containing base metal; and (b) treating the surface of the turbine component with a cleaning composition to convert the engine deposits thereon to a removable smut without substantially etching the base metal of the turbine component, wherein the cleaning composition comprises an aqueous solution that is substantially free of acetic acid and comprises: a nitrate ion source in an amount, by weight of the nitrate ion, of from about 470 to about 710 grams/liter; and a bifluoride ion source in an amount, by weight of the bifluoride ion, of from about 0.5 to about 15 grams/liter. 2. The method of claim 1 wherein the cleaning composition comprises the nitrate ion source in an amount, by weight of the nitrate ion, of from about 565 to about 665 grams/liter; and the bifluoride ion source in an amount, by weight of the bifluoride ion, of from about 5 to about 10 grams/liter. 3. The method of claim 1 wherein the nitrate ion source comprises nitric acid, sodium nitrate, potassium nitrate, ammonium nitrate, or combinations thereof. 4. The method of claim 1 wherein the bifluoride ion source comprises ammonium bifluoride, sodium bifluoride, potassium bifluoride, or combinations thereof. 5. The method of claim 1 wherein step (b) is carried out by treating the surface of the turbine component with the cleaning composition for a period of from about 1 to about 10 minutes. 6. The method of claim 3 wherein the nitrate ion source comprises nitric acid. 7. The method of claim 4 wherein the bifluoride ion source comprises ammonium bifluoride. 8. The method of claim 5 wherein step (b) is carried out by treating the surface of the turbine component with the cleaning composition for a period of from about 3 to about 7 minutes. 9. The method of claim 5 wherein step (b) is carried out by immersing the turbine component in the cleaning composition or by soaking the turbine component with the cleaning composition. 10. A method comprising the following steps: (a) providing a turbine component that is a turbine disk or turbine shaft, the turbine component having a surface and comprising a nickel and/or cobalt-containing base metal; and (b) treating the surface of the turbine component with a cleaning composition for a period of from about 1 to about 10 minutes and sufficient to convert engine deposits formed on the surface during operation of a gas turbine engine to a removable smut without substantially etching the base metal of the turbine component, wherein the cleaning composition comprises an aqueous solution that is substantially free of acetic acid and comprises: a nitrate ion source in an amount, by weight of the nitrate ion, of from about 470 to about 710 grams/liter; and a bifluoride ion source in an amount, by weight of the bifluoride ion, of from about 0.5 to about 15 grams/liter; and (c) removing the smut from the treated surface of the turbine component in a manner that does not substantially alter the surface thereof. 11. The method of claim 10 wherein step (b) is carried out by immersing the turbine component in the cleaning composition or by soaking the turbine component with the cleaning composition. 12. The method of claim 10 wherein the cleaning composition comprises nitric acid in an amount, by weight of the nitrate ion, of from about 565 to about 665 grams/liter; and ammonium bifluoride in amount, by weight of the bifluoride ion, of from about 5 to about 10 grams/liter. 13. The method of claim 10 wherein step (c) is carried out by gently grit blasting the surface of the turbine component to remove the smut. 14. The method of claim 10 wherein step (b) is carried out by treating the surface of the turbine component with the cleaning composition for a period of from about 3 to about 7 minutes.
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