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Corrosion Testing of Brazed Space Station IATCS MaterialsIncreased nickel concentrations in the IATCS coolant prompted a study of the corrosion rates of nickel-brazed heat exchangers in the system. The testing has shown that corrosion is occurring in a silicon-rich intermetallic phase in the braze filler of coldplates and heat exchangers as the result of a decrease in the coolant pH brought about by cabin carbon dioxide permeation through polymeric flexhoses. Similar corrosion is occurring in the EMU de-ionized water loop. Certain heat exchangers and coldplates have more silicon-rich phase because of their manufacturing method, and those units produce more nickel corrosion product. Silver biocide additions did not induce pitting corrosion at silver precipitate sites.
Document ID
20110002094
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Pohlman, Matthew J.
(Honeywell, Inc. Houston, TX, United States)
Varisik, Jerry
(Hamilton Sundstrand Corp. Houston, TX, United States)
Steele, John W.
(Hamilton Sundstrand Corp. Houston, TX, United States)
Golden, Johnny L.
(Boeing Co. Houston, TX, United States)
Boyce, William E.
(Boeing Co. Houston, TX, United States)
Pedley, Michael D.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
July 19, 2004
Subject Category
Chemistry And Materials (General)
Report/Patent Number
9904ICES-205
JSC-CN-8531
Meeting Information
Meeting: 34th International Conference on Environmental Systems (ICES)
Location: Colorado Springs, CO
Country: United States
Start Date: July 19, 2004
End Date: July 22, 2004
Sponsors: Society of Automotive Engineers, Inc.
Distribution Limits
Public
Copyright
Other

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