US 11,834,632 B2
Cleaning solution and methods of cleaning a turbine engine
Nicole Jessica Tibbetts, Delanson, NY (US); Evan J Dolley, Niskayuna, NY (US); Bernard Patrick Bewlay, Niskayuna, NY (US); Denise Anne Anderson, Mechanicville, NY (US); Nathan David McLean, Glenville, NY (US); Eric John Telfeyan, Delanson, NY (US); and Frank Wagenbaugh, Leeds, NY (US)
Assigned to General Electric Company, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Mar. 26, 2018, as Appl. No. 15/936,318.
Application 15/936,318 is a division of application No. 14/874,924, filed on Oct. 5, 2015, granted, now 9,926,517.
Application 14/874,924 is a continuation in part of application No. 14/484,897, filed on Sep. 12, 2014, abandoned.
Claims priority of provisional application 61/913,805, filed on Dec. 9, 2013.
Prior Publication US 2018/0216036 A1, Aug. 2, 2018
Prior Publication US 2020/0102523 A9, Apr. 2, 2020
Int. Cl. C11D 3/20 (2006.01); C11D 11/00 (2006.01); C23G 1/06 (2006.01); C23G 1/08 (2006.01); C11D 1/83 (2006.01); B08B 3/08 (2006.01); C11D 1/94 (2006.01); C11D 3/30 (2006.01); C11D 3/34 (2006.01); C23G 1/02 (2006.01); F01D 25/00 (2006.01); C11D 1/72 (2006.01); C11D 1/88 (2006.01)
CPC C11D 3/2086 (2013.01) [B08B 3/08 (2013.01); C11D 1/83 (2013.01); C11D 1/94 (2013.01); C11D 3/2075 (2013.01); C11D 3/30 (2013.01); C11D 3/3409 (2013.01); C11D 11/0041 (2013.01); C23G 1/02 (2013.01); C23G 1/061 (2013.01); C23G 1/088 (2013.01); F01D 25/002 (2013.01); C11D 1/72 (2013.01); C11D 1/88 (2013.01); Y02T 50/60 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A cleaning solution for an in-situ aircraft turbine engine having internal passages and at least some components that have mineral dust accumulated thereon, wherein at least some of the mineral dust has thermally reacted to form CMAS-based reaction products, comprising:
0.21 weight percent citric acid;
0.21 weight percent glycolic acid;
0.14 weight percent isopropylamine sulphonate;
0.07 weight percent alcohol ethoxylate;
0.07 weight percent triethanol amine;
0.03 weight percent monosodium-N-lauryl-B-iminodipropionic acid;
(CH)2N(NH)CH that was added to titrate the cleaning solution to a pH of 5.5;
and wherein a balance of the cleaning solution comprises water
such that when applied to the in-situ aircraft turbine engine, the cleaning solution selectively dissolves interstitial cements and both unreacted sub-layers of the mineral dust accumulations and the CMAS-based reaction products to thereby remove foreign material from the in-situ aircraft turbine engine without pitting corrosion or preferential etching at grain boundaries and without detriment to tensile fracture strength of the in-situ aircraft turbine engine.