Tritium Retention in Hexavalent Chromate-Conversion–Coated Aluminum Alloy
Abstract
In this work, 6061-T6 aluminum samples were subjected to MIL-DTL-5541F type I, class-3 anodic coatings, where a yellow irradiate finish was achieved. Both chromate-conversion coatings (CCC) and unmodified samples were exposed to DT (PT = 0.51 atm) gas for 24 h at room temperature. Following loading, the samples were subjected to one of two desorption techniques: temperature-programmed desorption, or a surface stripping technique. The results show that chromic-acid anodizing of aluminum dramatically increases the total quantity of tritium retained by the treated surface as compared to unmodified aluminum. X-ray photoelectron spectroscopy and scanning electron microscopy studies of both treated aluminum and unmodified samples indicate that the CCC coating contain significant quantities of hydrated chromium. Using transmission electron microscopy, the surface is shown to have significant cracking and fracturing of the film and leads to a highly grained and porous surface. Such surface defects coupled with the vast quantity of hydration sites are likely reasons for the increased retained tritium inventory observed for CCC samples. Finally, due to the physical and chemical properties of unmodified CCC samples, they are not suitable for use in tritium environments.
- Authors:
-
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics, and Dept. of Physics and Chemistry
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics
- Publication Date:
- Research Org.:
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1574231
- Grant/Contract Number:
- NA0003856
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Fusion Science and Technology
- Additional Journal Information:
- Journal Volume: 75; Journal Issue: 8; Conference: Technology of Fusion Energy 2018, Orlando, FL (United States), 11-15 Nov 2018; Journal ID: ISSN 1536-1055
- Publisher:
- American Nuclear Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; chromate-conversion coatings; materials development and modeling; tritium materials
Citation Formats
Fagan, C., Sharpe, M., Shmayda, W. T., and Schröder, W. U. Tritium Retention in Hexavalent Chromate-Conversion–Coated Aluminum Alloy. United States: N. p., 2019.
Web. doi:10.1080/15361055.2019.1610308.
Fagan, C., Sharpe, M., Shmayda, W. T., & Schröder, W. U. Tritium Retention in Hexavalent Chromate-Conversion–Coated Aluminum Alloy. United States. https://doi.org/10.1080/15361055.2019.1610308
Fagan, C., Sharpe, M., Shmayda, W. T., and Schröder, W. U. Wed .
"Tritium Retention in Hexavalent Chromate-Conversion–Coated Aluminum Alloy". United States. https://doi.org/10.1080/15361055.2019.1610308. https://www.osti.gov/servlets/purl/1574231.
@article{osti_1574231,
title = {Tritium Retention in Hexavalent Chromate-Conversion–Coated Aluminum Alloy},
author = {Fagan, C. and Sharpe, M. and Shmayda, W. T. and Schröder, W. U.},
abstractNote = {In this work, 6061-T6 aluminum samples were subjected to MIL-DTL-5541F type I, class-3 anodic coatings, where a yellow irradiate finish was achieved. Both chromate-conversion coatings (CCC) and unmodified samples were exposed to DT (PT = 0.51 atm) gas for 24 h at room temperature. Following loading, the samples were subjected to one of two desorption techniques: temperature-programmed desorption, or a surface stripping technique. The results show that chromic-acid anodizing of aluminum dramatically increases the total quantity of tritium retained by the treated surface as compared to unmodified aluminum. X-ray photoelectron spectroscopy and scanning electron microscopy studies of both treated aluminum and unmodified samples indicate that the CCC coating contain significant quantities of hydrated chromium. Using transmission electron microscopy, the surface is shown to have significant cracking and fracturing of the film and leads to a highly grained and porous surface. Such surface defects coupled with the vast quantity of hydration sites are likely reasons for the increased retained tritium inventory observed for CCC samples. Finally, due to the physical and chemical properties of unmodified CCC samples, they are not suitable for use in tritium environments.},
doi = {10.1080/15361055.2019.1610308},
journal = {Fusion Science and Technology},
number = 8,
volume = 75,
place = {United States},
year = {Wed May 29 00:00:00 EDT 2019},
month = {Wed May 29 00:00:00 EDT 2019}
}
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