[Table of Contents]

Plasma and Fusion Research

Volume 8, 2405076 (2013)

Regular Articles

Hydrogen Permeability of Nitrided Stainless Steel
Takashi WATANABE, Teruya TANAKA and Akio SAGARA
National Institute for Fusion Science, 322-6 Toki, Gifu 509-5292, Japan
(Received 7 December 2012 / Accepted 15 April 2013 / Published 19 June 2013)

Abstract

The surface of a 316 stainless steel (316SS) specimen was nitrided by an electrochemical treatment in molten fluoride salt. Its hydrogen permeability was evaluated and compared with that of bare 316SS at temperature from 450°C to 650°C. When it was exposed to hydrogen pressure of 1.0 kPa from 450°C to 650°C, its permeability was 7.2 × 10−11 to 6.4 × 10−12 mol/sec.m.Pa1/2. The permeation flux was increased with temperature and the permeability is deviated from Sieverts' law around 450°C. It followed Sieverts' law and was similar to that of bare 316SS at elevated temperatures. This result suggested the surface nitriding increases solubility at low temperatures around 450°C.

Keywords

blanket system, molten fluoride salt, structural material, electrochemical nitriding, hydrogen permeability control

DOI: 10.1585/pfr.8.2405076

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References

  • [1] A. Sagara et al., Nucl. Fusion 45, 258 (2005).
  • [2] T. Watanabe et al., J. Plasma Fusion Res. Series 9, 342 (2010).
  • [3] T. Watanabe et al., Electrochimica Acta 58, 681 (2011).
  • [4] K.S. Pisarev et al., J. Nucl. Mater. 160, 117 (188).
  • [5] T. Shiraishi et al., J. Nucl. Mater. 273, 60 (1999).
  • [6] C. Shan et al., J. Nucl. Mater. 191-194, 221 (1992).
  • [7] Z. Yao et al., J. Nucl. Mater. 283-287, 1287 (2000).
  • [8] A.M. Brass et al., J. Mater. Sci. 24, 1693 (1989).
  • [9] Z. Wolarek et al., Acta Materialia 52, 2637 (2004).
  • [10] Z. Wolarek et al., Acta Materialia 54, 1525 (2006).

This paper may be cited as follows:

Takashi WATANABE, Teruya TANAKA and Akio SAGARA, Plasma Fusion Res. 8, 2405076 (2013).