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Corrosive effects of supercritical carbon dioxide and cosolvents on metals [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
10 pages : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
With the eventual phase-out of chlorofluorocarbons, and restrictive regulations concerning the use of cleaning solvents such as hydrochlorofluorocarbons, and other volatile organic compounds, it is essential to seek new, environmentally acceptable cleaning processes. In the DOE Complex and in industry, an environmentally sound process for precision cleaning of machined metal parts is one of the issues that needs to be addressed. At Sandia, we are investigating the use of supercritical carbon dioxide (CO₂) as an alternative cleaning solvent for this application. Carbon dioxide is nontoxic, recyclable, and relatively inexpensive. Supercritical CO₂ has been demonstrated as a solvent for many nonpolar organic compounds, including hydrocarbon-based machining and lubricating oils. The focus of this work is to investigate any corrosive effects of supercritical CO₂ cleaning on metals. Sample coupons of several common metals were statically exposed to pure supercritical CO₂, water saturated supercritical CO₂, and 10 wt % methanol/CO₂ cosolvent at 24,138 kPa (3500 psi) and 323K (50C) for 24 hours. Gravimetric analysis and magnified visual inspection of the coupons were performed before and after the exposure tests. Electron microprobe, x-ray photoelectron spectroscopy (XPS), and Auger electron surface analyses were done as needed where visual and gravimetric changes in the samples were evident. Results are reported.
Report Numbers
E 1.99:sand--94-1483c
E 1.99: conf-9406181--1
conf-9406181--1
sand--94-1483c
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
06/01/1994.
"sand--94-1483c"
" conf-9406181--1"
"DE94012921"
"GB0103012"
Joint Army, Navy, NASA, Air Force environmentally benign cleaning and degreasing technical workshop,Indian Head, MD (United States),14-15 Jun 1994.
Adkins, C.L.J.; Sorensen, N.R.; Russick, E.M.; Poulter, G.A.
Funding Information
AC04-94AL85000
View MARC record | catkey: 14455802