Claims
- 1. A cleaning composition for chemically dislodging deposits from the internal components of a gas turbine engine, while preserving the alloys or coatings used therein, said composition comprising:
- an aqueous solution of 0.1-2.0 molar hydroxylamine sulfate, a chelating agent, 0.1-4.0 molar concentration of a compound selected from the group consisting of ammonium sulfamate, sulfamide, and hydroxylamine-o-sulfonic acid, and, an alkaline pH modifying substance added in an amount sufficient to achieve a pH value of from 6.5 to 14.
- 2. The composition of claim 1 wherein said pH modifying substance is ammonium hydroxide.
- 3. The composition of claim 1 additionally comprising up to 2.0 molar ethylenediamine.
- 4. A cleaning composition for chemically dislodging deposits from the internal components of a gas turbine engine, while preserving the alloys or coatings used therein, said composition comprising an aqueous solution of 0.4 molar hydroxylamine sulfate, 0.4 molar ethylenediamine, 0.7 molar ammonium sulfamate, and 0.8 molar N-hydroxyethlethyenediaminetriacetic acid with ammonium hydroxide added in an amount sufficient to achieve a pH value of between 7 and 8.5.
- 5. A cleaning composition for chemically dislodging deposits from the internal components of a gas turbine engine, while preserving the alloys or coatings used therein, the composition comprising an admixture of:
- a first solution comprising an aqueous solution of hydroxylamine sulfate and water, having a pH of less than 4; and,
- a second solution comprising a chelating agent, a compound selected from the group consisting essentially of ammonium sulfate, sulfamide and hydroxylamine-o-sulfonic acid, and, an alkaline pH modifying substance added in an amount sufficient to achieve a pH of between 9 and 14.
Government Interests
The Government has rights in the invention pursuant to Contract No. F33657-84-C-2122 awarded by the Department of the Air Force.
This is a division of application Ser. No. 829,044, filed on Feb. 13, 1986, now U.S. Pat. No. 4,713,120.
US Referenced Citations (21)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2306697 |
Aug 1974 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
829044 |
Feb 1986 |
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