Treatment of stainless steel apparatus used in the manufacture,

Details Treatment of stainless steel apparatus used in the manufacture, Treatment of stainless steel apparatus used in the manufacture,

1982-05-26

1984-02-21

Kellogg, Arthur D.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 21, 134 28, 134 29, 134 41, C23G 102

Patent

active

044328087

ABSTRACT:
A process is disclosed for cleaning and passivating stainless steel apparatus used in the manufacture, transport, storage and/or use of nitrogen oxides. The process involves sequentially treating stainless steel surfaces of apparatus which contact a nitrogen oxide, with various solutions, in such manner as to enable the apparatus to substantially maintain the quality of the nitrogen oxide to be manufactured, transported, stored and/or used therein. Thus, for example, the purity of nitrogen tetroxide, used as a propellant for rocket engines and the like, may be maintained longer, the shelf life significantly increased and rocket engine flow decay problems markedly reduced through use of the disclosed cleaning and passivating process.

REFERENCES:
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patent: 3270860 (1966-09-01), Siebach
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patent: 3401061 (1968-09-01), Watanabe
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patent: 3598741 (1971-08-01), Kanno
patent: 3799803 (1974-03-01), Kraus et al.
patent: 3880681 (1975-04-01), Sifre et al.
"Flow Decay" by C. C. Addison, Dept. of Inorganic Chemistry, The University, Nottingham NG7 2RD, Contract FG1052-70-C-0035, Jun. 30, 1972, pp. 101, 103, 104, 115, 117, 122, 124, 126, 132, 133, 135, 136, 139, AFRPL-TR-72-84.

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