Influence of Microstructure on the Absorption of Tritium into Gold-Plated 316 Stainless Steel

Sharpe, M.; Shmayda, W. T.

doi:10.1080/15361055.2022.2147759

Influence of Microstructure on the Absorption of Tritium into Gold-Plated 316 Stainless Steel

Journal Article · Fri Jan 27 00:00:00 EST 2023 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2022.2147759· OSTI ID:1993058

Sharpe, M. ^[1]; Shmayda, W. T. ^[2]

University of Rochester, NY (United States); Laboratory for Laser Energetics, University of Rochester
University of Rochester, NY (United States)

The interaction of tritium with metal surfaces is the initial step in the overall absorption of tritium by the substrate metal. As a result, limiting the adsorption of tritium to the surface may effectively reduce the quantity of tritium absorbed by a metal when it is in contact with tritium gas. To limit tritium adsorption, many tritium users electroplate gold onto the substrate metal. The gold layer is expected to reduce tritium adsorption, and subsequently absorption, by reducing water adsorption. The present work shows a comparison between tritium inventories in nonplated 316 stainless steel to the inventories in 316 stainless-steel samples electroplated with gold by various commercial vendors and laboratories. Of the various gold-plated samples, only one type of plating shows ~25% reduction in tritium inventory, relative to non-plated steel samples. The degree of tritium absorption appears to be significantly influenced by the porosity, texture, and completeness of the gold layer. Incomplete and/or porous layers lead to increased absorption, while gold layers with smaller surface features lead to similar tritium inventories as non-plated samples. Furthermore, reduced tritium absorption was observed only for complete gold layers with small surface features.

Research Organization:: University of Rochester, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003856

OSTI ID:: 1993058

Journal Information:: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 8 Vol. 79; ISSN 1536-1055

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Tritium
absorption
gold
stainless steel

Influence of Microstructure on the Absorption of Tritium into Gold-Plated 316 Stainless Steel

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