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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Corrosion Testing of Brazed Space Station IATCS Materials


    Additional title:

    Sae Technical Papers



    Conference:

    International Conference On Environmental Systems ; 2004



    Publication date :

    2004-07-19




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Corrosion Testing of Brazed Space Station IATCS Materials

    Pohlman, M. J. / Varsik, J. / Steele, J. W. et al. | British Library Conference Proceedings | 2004



    ISS Internal Active Thermal Control System (IATCS) Coolant Remediation Project

    Holt, Mike / Morrison, Russell H. | SAE Technical Papers | 2005


    ISS Internal Active Thermal Control System (IATCS) Coolant Remediation Project

    Morrison, R. H. / Holt, M. / Society of Automotive Engineers | British Library Conference Proceedings | 2005


    ISS Internal Active Thermal Control System (IATCS) Coolant Remediation Project - 2006 Update

    Holt, Mike / Morrison, Russell H. | SAE Technical Papers | 2006