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The effects of surface pretreatment and nitrogen tetroxide purification on the corrosion rate of Type 304L stainless steelCorrosion rates of 304L stainless steel coupons in MON-1 oxidizer have been measured as a function of cleaning procedures employed, surface layer positions, propellant impurity levels, and short-term exposure durations (14 to 90 days). Of special interest was propellant contamination by buildup of soluble iron, which may cause flow decay. Surface treatments employed were combinations of cleaning, pickling, and passivation procedures. Propellants used were MIL-SPEC MON-1 and several types of purified NTO (i.e., low water, low chloride) which may, at a later time, be specified as spacecraft grade. Pretest coupon surface analysis by X-ray photoelectron spectroscopy (XPS-ESCA) has revealed important differences, for the different cleaning procedures, in the make-up of the surface layer, both in composition and state of chemical combination of the elements involved. Comparisons will be made of XPS/ESCA data, for different cleaning procedures, for specimens before and after propellant exposure.
Document ID
19860007926
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Blue, G. D.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Moran, C. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1985
Publication Information
Publication: Johns Hopkins Univ. The 1985 JANNAF Propulsion Meeting, Volume 1
Subject Category
Metallic Materials
Accession Number
86N17396
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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