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Corrosion Testing of Brazed Space Station IATCS Materials
Technical Paper
2004-01-2471
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Increased 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.
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Citation
Pohlman, M., Varsik, J., Steele, J., Golden, J. et al., "Corrosion Testing of Brazed Space Station IATCS Materials," SAE Technical Paper 2004-01-2471, 2004, https://doi.org/10.4271/2004-01-2471.Also In
References
- 07 Dec 1998
- IATCS pH Corrosion Testing Final Report Boeing Houston Report D684-XXXXX