2020-07-272020-07-272020-07-31ICES_2020_341https://hdl.handle.net/2346/86367Justin Niehaus, National Aeronautics and Space Administration (NASA), USSuleyman Gokoglu, National Aeronautics and Space Administration (NASA), USSandip Mazumder, Ohio State University, USGordon Berger, Universities Space Research Association, USJohn Easton, Case Western Reserve University, USICES509: Fire Safety in Spacecraft and Enclosed HabitatsThe proceedings for the 2020 International Conference on Environmental Systems were published from July 31, 2020. The technical papers were not presented in person due to the inability to hold the event as scheduled in Lisbon, Portugal because of the COVID-19 global pandemic.Experiments were performed to understand the interaction of gaseous hydrogen chloride (HCl) with aluminum surfaces in the presence of water vapor. The results show that increasing levels of relative humidity, tested for 10, 25, and 50 percent in air, increase the capacity of HCl adsorption compared to results previously published with dry air flow. A series of tests were performed on individual aluminum samples after they had been saturated with a fixed concentration of HCl in dry air conditions with the goal of determining how their HCl uptake capacity change after various treatments with water relative to the original saturation run. HCl-saturated aluminum samples subjected to a second dry air flow at the same HCl concentration as the original test had an uptake of 23.5% of the original sample. Saturated aluminum samples subjected to an in-between clean-up relative humidity of 90% air flow had an uptake of 35.6% of the original. Saturated aluminum samples submerged in distilled water for 12 hours had an uptake of 82.2% of the original sample. Saturated aluminum subjected to 50% humid air resulted in similar uptake characteristics in multiple repeated tests. These small-scale tests were run in parallel to a large-scale ground duct test used to mimic the stand-off in the Cygnus spacecraft during a Saffire experiment. Conclusions of this testing will be used in the design of large-scale spacecraft fire safety experiments and to develop a model to account for the interactions of HCl and aluminum surfaces in the presence of water in those tests.application/pdfengFire safetySmokeAcid gasSurface kineticsPresentation