Publication Date:
2019-07-13
Description:
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.
Keywords:
Chemistry and Materials (General)
Type:
9904ICES-205
,
JSC-CN-8531
,
34th International Conference on Environmental Systems (ICES); Jul 19, 2004 - Jul 22, 2004; Colorado Springs, CO; United States
Format:
text
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