Evaluation of Alternate Stainless Steel Surface Passivation Methods

Clark, Elliot A.

Savannah River Site (S.C.)

关键词: Isotopic Exchange;    Monitoring;    Hydrogen Isotopes;    Tritium;    36 Materials Science;   

DOI  :  10.2172/881451
RP-ID  :  WSRC-TR-2005-00246
RP-ID  :  DE-AC09-96SR18500
RP-ID  :  881451

美国|英语

来源: UNT Digital Library

【 摘 要 】

Stainless steel containers were assembled from parts passivated by four commercial vendors using three passivation methods. The performance of these containers in storing hydrogen isotope mixtures was evaluated by monitoring the composition of initially 50% H{sub 2} 50% D{sub 2} gas with time using mass spectroscopy. Commercial passivation by electropolishing appears to result in surfaces that do not catalyze hydrogen isotope exchange. This method of surface passivation shows promise for tritium service, and should be studied further and considered for use. On the other hand, nitric acid passivation and citric acid passivation may not result in surfaces that do not catalyze the isotope exchange reaction H{sub 2} + D{sub 2} {yields} 2HD. These methods should not be considered to replace the proprietary passivation processes of the two current vendors used at the Savannah River Site Tritium Facility.