Propulsion cleaning system

Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...

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134 28, 134 41, 25218828, C23G 108, C23G 110, C23G 112

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active

057208247

ABSTRACT:
A method is provided for removing metal oxide debris from various types of surfaces, both metallic and nonmetallic. Specifically, the surface to be cleaned is treated (preferably by immersion) with a preheated solution of 65 to 71 wt % (55.3 to 62.0 vol %) nitric acid, which is roughly equivalent to reagent grade nitric acid. The temperature of the solution is within the range of about 160.degree. to 175.degree. F. (71.degree. to 79.degree. C.). The preheated solution dissolves any metal oxide debris present on the surface, which may then be rinsed away following treatment. The method effects the removal of metal oxide residue from surfaces without further degrading the surfaces being cleaned. Further, the method is capable of cleaning internal surfaces of components without requiring disassembly of sealed or welded components, since all that is needed to effect cleaning is contact between the surface to be cleaned and the preheated solution. Finally, the method is easily implemented since it involves only the simple steps of contacting the component with a single preheated component that is widely available, namely reagent grade nitric acid, followed by rinsing and drying.

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American Society for Testing & Materials ("ASTM"); Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems; Designation: A380-94a; Feb. 1, 1996; pp. 1-12.
ASTM; Standard Recommended Practice for "Descaling and Cleaning Titanium and Titanium Alloy Surfaces"; Designation: B-600-74; Reapproved 1985 pp. 469-471.
Federal Specification; "Passivation Treatments For Corrosion-Resistant Steel"; QQ-P-35C; Oct. 28, 1988; pp. 1-11.
Alfred C. Wright; USAF Propellant Handbooks, vol. II, "Nitric Acid/Nitrogen Tetroxide Oxiders"; vol. II; Feb. 1977, 3.40-3.41.
Baxter Scientific Products Specification Sheets for Nitric Acid; pp. 234-236.
Mallinckrodt Material Safety Data, Nitric Acid, 70%; Apr. 6, 1989; (3 pages).

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