| 摘要 |
A method and cleaning composition for removing engine deposits (58) from turbine components (10), in particular turbine disks (10) and turbine shafts (10). This method comprises the following steps: (a) providing a turbine component (10) having a surface (14) with engine deposits (58) thereon, wherein the turbine componen t (10) comprises a nickel and/or cobalt-containing base metal (50); and (b) treatin g the surface (14) of the turbine component (10) with a cleaning composition to convert the engine deposits (58) thereon to a removable smut without substantially etchi ng the base metal (50) of the turbine component (10). 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 470 to 710 grams/liter; and a bifluoride ion source in an amount, by weight of the bifluoride ion, o f from 0.5 to 15 grams/liter. The smut that is formed can be removed from the surface (14) of the turbine component (10) in a manner that does not substantially alter the surface (14) thereof.
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